The Verge Holiday Gift Guide 2019
82 great gift ideas for the holidays
by Verge StaffAs the end of 2019 approaches, it’s a good time to think back and reflect on the year that was and to think about the friends, family, and co-workers in our lives who we are grateful and thankful to have. While it can be difficult to find a way to express that sentiment with a gift — which is why they say it’s the thought that counts — you still want to make sure you give them something good and not, like, rock hard fruit cake.
That’s why we convene the greatest minds at The Verge each year to put together our annual holiday gift guide list that’s full of gift suggestions. Whether you need a gift for friends, family, co-workers, pets, they, them, him, her, secret Santa, white elephant, or just something to inspire your own unique gift idea, here are some of our top picks.
Category
books games & toys creative audio home phones misc camera outdoor laptop/tablet wearable power/cables
Price
under $20 $20 to $50 $50 to $150 $150 to $400 $400+
Alphabet Squadron by Alexander Freed
Set in the aftermath of Star Wars: Return of the Jedi, the story follows the creation of a special ragtag group of starfighter pilots who are tasked with tracking down a dangerous rogue squad of TIE fighters wreaking havoc on the New Republic. Price: ~$15
Sekiro: Shadows Die Twice
If you're a glutton for challenging games, Sekiro: Shadows Die Twice hangs with the likes of Dark Souls, as it comes from the same developer. Set in feudal Japan, this game puts even more of a focus on reflex-based fights and vertical gameplay. Price: ~$40
iRig Micro Amp
The iRig Micro Amp is a guitar-friendly amplifier packed into a miniature box with a four-inch speaker that can connect with your phone, iPad, Mac, or PC. It's got EQ, gain, and volume controls, and it can last for about 15 hours on six AA batteries at 7.5 watts. Use a nine-volt adapter, and it's bumped up to 15 watts. Price: ~$150
Folio Society's Game of Thrones
Perfect for the disillusioned Game of Thrones fan in your life, return to George R.R. Martin's A Song of Ice and Fire series that the show is based on with this impressive Folio Society edition. It's filled with incredible illustrations, a massive map, and it has a gorgeous design. The Folio Society promises that it'll be releasing the rest of the series in a similar fashion, assuming GRRM ever gets around to writing it. Price: ~$195
How To by Randall Munroe
How To is the latest book from XKCD creator Randall Munroe. Filled with his iconic stick figure drawings, clever sense of humor, and cold, hard science, How To gives instructions on everything from moving your house to building a lava moat. Price: ~$17
Twelve South Fermata headphone stand
Having a headphone stand is a lot like having dedicated hangers for your belts and / or ties: it's not completely necessary, but it makes life feel a lot more organized. Fermata's stand is better than most because it includes a Micro USB charging cable, so you'll never have dead headphones. Price: ~$50
Amazon Echo Dot
Amazon's Echo Dot is an affordable smart speaker that will impress you with its countless skills. It's also a fairly good-sounding speaker on its own, capable of filling a room with music from your favorite streaming service. Price: ~$50
Sonos Move
The Sonos Move is the speaker a lot of Sonos owners have been waiting for. It's battery-powered, so users can move it from one room to another in their homes. At its price, it's definitely a premium gift, but there's little else out there quite like it. Price: ~$399
The Raven Tower by Ann Leckie
This is Leckie’s first fantasy novel. Much like her Imperial Radch science fiction series, it tells the story from the perspective of someone who doesn’t think or process things the way a human does. In this story about how gods and humans coexist in this fantasy world, it helps to draw a starker contrast on how different they are. Price: ~$10
Intro-Level Ableton
Twenty-five years ago, if your kid was into music, you bought them a guitar. Now, you buy Ableton. The intro level doesn't come with many instruments built in, but there are enough freeware synths out there to keep a person busy for years. Price: ~$99
SteelSeries Arctis 1 Wireless
Getting your wireless headphones to work with the Nintendo Switch is usually a nightmare, but it's a problem that SteelSeries' Arctis 1 Wireless solves. It includes a headset that's pre-paired with its handy USB-C adapter, which means you'll be experiencing seamless, lag-free audio in no time. Price: ~$99
Apple Airpods with Wireless Charging Case
AirPods may not be the best-sounding wireless earbuds — and they're certainly not the most stylish — but for iPhone users, there's no pair of cordless buds that works better. The latest model of the original AirPods comes with the new H1 chip for better call quality, hands-free Siri access, and the case can be wirelessly charged. Price: ~$180
Witch Hat Atelier by Kamome Shirahama
This is a gorgeously illustrated fantasy comic about the daughter of a seamstress who dreams of learning magic, only to be pulled into the very secretive world of magicians when tragedy befalls her family because of her magical pursuit. It is reminiscent of books like A Wizard of Earthsea. Price: ~$10
Trick Mirror by Jia Tolentino
Trick Mirror brings together nine new essays from The New Yorker’s culture critic, which range in subject from optimization to the ills of the social internet to the heroine’s journey. They offer a unique combination of insight, humor, and honesty to complex topics of discussion. Price: ~$22
The Legend of Zelda: Link's Awakening
Link’s Awakening on the Switch is a great remake of the Game Boy classic. The new graphics make it seem like you’re playing with tiny toy figurines, and the game’s world, puzzles, and dungeons are just as fun to explore as they were in 1993. Price: ~$59
UE Megaboom 3
Ultimate Ears has continued to impress over the years with the stylish, great-sounding Boom Bluetooth speaker line. The original Boom became a market leader back in 2013 when the category first took off, and the MegaBoom 3 represents every improvement since. It's loud, it looks great, and it sounds even better. Price: ~$200
Google Pixel 4
The Pixel 4 is Google's latest phone, created with a blend of high-end and experimental features. It has a 90Hz display, 6GB of RAM, and the latest Android 10 software. But the real differentiator is its dedicated radar chip that you can control by waving your hands around. Price: ~$799
Baum-Kuchen Idea notebook
Sometimes you just need an analog place to put your ideas. These notebooks are ideally suited for the task with 72 pages of gridded paper. They're perfect for sketches, diagrams, or written text — whatever helps you get your ideas out. Price: ~$11
Super Pumped: The Battle for Uber by Mike Isaac
Super Pumped: The Battle for Uber is part nonfiction, part corporate thriller. It chronicles the history of Uber and the rise and fall of former CEO Travis Kalanick. This deeply reported book is a fascinating look at one of the most influential companies of the decade. Price: ~$25
Awair Glow C
There are a lot of smart plugs out there, but Awair's Glow C is the only one that packs in air quality, temperature, and humidity sensors. It also has a customizable nightlight. Plug an air conditioner or fan into the Glow C, and have it automatically come on whenever your room needs fresh air or is getting uncomfortably hot. Price: ~$89
Bose 700 Wireless Headphones
Bose has always been a dominant force in the field of noise-canceling headphones, and its new 700 model reaffirms why. They have a sleek and premium build, more effective noise cancellation, better voice call quality, and USB-C charging. Price: ~$399
Apple iPhone 11
Apple's iPhone 11 may look a lot like last year's XR, but the company made some big changes, including a massive battery that lasts way longer, a camera that's one of (if not the) best on any smartphone, and an even more accelerated processor. If you're looking to buy an iPhone this holiday season, this is the one to get. Price: ~$700
Railroad Ink
Railroad Ink is a compact and simple game about trying to draw a better train network than your friends based on dice rolls of different intersections of tracks. Even though you are all using the same pieces, how the networks actually look at the end will be very different. Price: ~$20
Control
This is one part action game, one part otherworldly / paranormal horror game. Jesse finds herself infiltrating the mysterious Federal Bureau of Control’s headquarters, called the Oldest House, in search of her long-lost brother. It is a wild ride that’ll have you searching for every little scrap about the mysteries of the Oldest House and FBC. Price: ~$45
Tom Bihn Daylight Briefcase
Tom Bihn's over-the-shoulder briefcase is a spacious, simple way to carry your belongings with you wherever you go. It's more than enough room for a Nintendo Switch and a 13-inch laptop as well as some cords and adapters. It might seem a little expensive, but it comes with a lifetime warranty against defects. Price: ~$85
Nintendo Switch
Nintendo's portable console has only gotten better in the last year, with great new games like Super Mario Maker 2, Fire Emblem: Three Houses, the Link's Awakening remake, and, of course, Pokémon Sword and Shield. Playable both on the go and a big screen and now featuring even better battery life than the original model, the Switch is still a no-brainer. Price: ~$299
Logitech Brio webcam
Designed to be the “Tesla of webcams,” the Brio offers 4K HDR streaming, 5x zoom, 60 frames per second streaming at 1080p, and even infrared facial recognition for services like Windows Hello, all in a sleek metal and glass package that’ll blend in seamlessly with most computer monitor setups. Price: ~$159
Samsung Galaxy Note 10
Samsung's latest flagship phone is its best one yet. The Note lineup is known for doing the most, but the Note 10 does even more. It's infused with more power, more features, and better looks than any other Note before it. Price: ~$850
CB2 Black Dip Large Mug
This two-tone mug looks great and won't break the bank. Why start your morning by drinking coffee out of a clear mug you got from a random event when you can begin your day with a little more style. Price: ~$7
PDP Faceoff Deluxe+ Switch Controller
PDP's wired Switch controller plugs into your dock and enables some things that aren't possible with Nintendo's own Pro controller. You can plug in headphones for private listening and voice chat in supported games. Price: ~$25
Amazon Echo Show 5
Amazon's Echo Show 5 is the company's smallest and least expensive smart display. It's great for seeing headlines or making video calls from your desk or as a smart alarm on a nightstand. Price: ~$90
Elgato HD60 S+
Elgato's HD60 S+ capture card is something you'll want to invest in if you're trying to get your streaming side gig (or hobby) off the ground. It connects through HDMI and can stream in 1080p at a smooth 60 frames per second, so your stream will look great. Price: ~$200
Mairico heavy duty kitchen shears
Kitchen scissors are an often-overlooked but incredibly useful tool to have in your home. Whether you need to cut meat, trim flowers, open packages, crack nuts, or even open a bottle, these scissors are great for all of your kitchen needs. Price: ~$7
Super Mario Maker 2
Make the Mario level of your dreams (or nightmares) with Super Mario Maker 2. This sequel to the Wii U original comes with tons of new level-making options, a Super Mario 3D World level theme, a story mode, and competitive online multiplayer. Price: ~$50
DJI Osmo Mobile 3
The Osmo Mobile 3 is perfect for someone who wants to shoot really smooth footage with the camera that’s already in their pocket. It’s lightweight, folds up easily to fit into a bag, and offers 15 hours of battery life at a price that won’t break the bank. Price: ~$119
Ikea Symfonisk
Ikea has teamed up with Sonos for the Symfonisk, a table lamp that's also a full-fledged Sonos speaker, complete with the company's best-in-class multiroom audio tech. It also has support for Apple's AirPlay 2 tech. Price: ~$179
DJI Spark
DJI's diminutive drone has been the go-to for anyone looking to get started with a drone since it launched in 2017, and it's still the best place to start for anyone looking to experiment with flying a drone or shooting drone photography. Price: ~$388
1Password subscription
If your loved ones are ignoring your (very sensible) advice to set up and use a password manager, then get them this. They might just feel guilty enough to actually use it. Price: $10 to $100
Judgment
Yagami is a disgraced lawyer-turned-private detective in the fictional Kamurocho district of Tokyo. Aside from handling other small cases for people around town, he gets pulled into a larger case involving warring Yakuza clans, corrupt police and government officials, and corporate espionage, which all ties into the case that caused him to stop being a lawyer. Price: ~$39
Lego Tree House
Lego's incredible treehouse set may not be based on a Star Wars or Marvel movie, but it does feature thousands of pieces, lots of intricate details, and leaves that can cycle through the seasons. Plus, it's just plain fun to build. Price: ~$199
Beam Electronics Universal Smartphone Car Air Vent Mount
This simple but well-designed air vent mount grips your phone safely, opens at the touch of a button, and provides space for a power cord and audio cord (provided your phone still uses one). Price: ~$13
The Quacks of Quedlinburg
You and your friends play as medieval alchemists who are trying to brew the best potions at a nine-day festival by blindly pulling new components for your brew from your ingredient bags. If you manage to push your luck enough, you might get the best potion of the day, or it might explode in your face. Price: ~$50
Amazon Kindle Paperwhite
Amazon makes a lot of Kindles, but the best of them is the Paperwhite. It's got the same, ultra-high pixel density backlit E Ink display as the pricier Oasis, it's waterproof, and it has Amazon's massive ebook library. If you want to carry a library in your pocket, this is the way to do it. Price: ~$150
Lego Apollo 11 Lunar Lander
The best part about Lego’s space sets is the company’s attention to detail when replicating actual spacecraft. You’ll have periodic moments of delight when you realize you’ve just built an actual propellant tank or installed the camera that was used to film Neil Armstrong’s famous walk down the ladder to the surface. This set is a great way to refresh your knowledge of vintage spacecraft design while enjoying crafts on an indoor afternoon.  Compared to previous models, it has a faster processor, and it now comes with a Touch Bar by default, which comes with a Touch ID fingerprint sensor embedded into it. Price: ~$1,300
Magnetic Personalities
Need some inspiration? These finger puppet versions of famous writers, scientists, and politicians are magnetized so they can stick to your monitor. Or you can just pop one on your finger and pretend you're conversing with Sigmund Freud, Jane Austen, Langston Hughes, or Schrodinger's cat. Price: ~$7
King Home Series 65 whetstone
It’s not only nice to have your kitchen knives sharp, but it’s also safer. Whetstones require a little practice and effort to use, but they are a great way to keep your knives sharper for longer. This set comes with a base that’ll keep the whetstone from moving as you sharpen. Price: ~$30
Moment Anamorphic Lens
Moment's Anamorphic lens turns your phone into a cinematic tool, allowing for true widescreen aspect ratios and natural lens flares (none of that fake stuff). You'll need the companion case to attach the lens (~$30) and the Moment Pro Camera app (~$5) to de-squeeze the anamorphic footage. Or you can import to your favorite video editing program and work your J.J. Abrams-esque magic from there. Price: ~$150
Withings Steel HR Sport
If you know someone who is hunting for a fitness tracker that looks more like a classic watch than a block of glass or plastic, the Steel HR Sport is exactly that. It works with both iOS and Android phones, needing only Withings’ health app, and it can stay charged for nearly a month. Price: ~$200
Wacom Cintiq 16
Wacom's most affordable display tablet yet, the Cintiq 16 is a great starting point for young creatives and hobbyists who want to make the jump to more professional devices. Price: ~$650
Dell XPS 13 2-in-1
Dell's latest XPS 13 polishes an already great laptop with one very important tweak: the webcam is finally on the top of the display. For your money, this is one of the best Windows 10 laptops you can currently buy. Price: ~$1,370
Anker USB-C to Lightning cable
If you've bought an iPhone in the past few years, it's probably capable of USB-C fast charging that will charge it way faster than Apple's awful in-box charger. But you'll need a USB-C to Lightning cable to do it, which (unless you've got the newest and priciest iPhone 11 Pro), Apple won't include with your new phone. Pick one of these up (along with a USB-C plug), and say goodbye to slow charging. Price: ~$17
Porcelain Dinosaur Planters
Everybody has loved dinosaurs at some point in their life, and these porcelain dinos are both useful and fun to look at. These planters will make your succulents and other plants look their best. Price: ~$40
Melifluos Cardigan Poncho
If your home or office can fluctuate between freezing cold and just not quite warm enough, it helps to have some additional layers of clothes on hand to insulate what heat you do have. These ponchos are not only a great lightweight option, but they're also stylish enough for any meeting. Price: ~$31
Wingspan
Wingspan is not only a gorgeously designed game, but it's also a clever one. Players amass different birds, building a gameplay engine that escalates as each round progresses. It's thoughful and wonderful to look at, and it's sure to be a crowd-pleaser at your next game night. Price: ~$76
Apple Watch Series 5
The latest Apple Watch makes a small but important leap over the previous model: an always-on display.  Better yet, this Apple Watch's battery doesn't suffer much when this feature is switched on. Price: ~$385
Rilakkuma cable protector
Is there a cuter way to protect your beloved cables from fraying than with an adorable bear wrapping itself around it? Probably not. Price: ~$9
Switched on Pop by Nate Sloan and Charlie Harding
Switched on Pop is the book based on the eponymous podcast that's all about peeking inside chart-topping songs. What makes certain melodies so popular? Why can't you get those lyrics out of your head? How did "Despacito" become a cultural moment? This book takes a deep dive into 16 modern classics to give you insights into the musical qualities of pop's biggest songs. Price: ~$25
RavPower 61W GaN charger
RavPower's 61W charger looks about the size of a phone charger, but it packs some serious firepower. It's enough to charge most laptops, while still fitting in the palm of your hand. If you have a USB-C laptop, you'll never want to travel with anything else again. Price: ~$36
Sega Genesis Mini
Whether you had a Sega Genesis growing up or not, this mini version of the console is a great idea for any gamer. It is everything you expect from a tiny retro console: it has a great library of 42 games and modern save functionality, with lots of great small details like menu music, moving bits of hardware, and access to games from multiple regions. Pictured with Sega Genesis Mini Tower of Power accessories. Price: ~$70
Sony WF-1000MX3 Wireless Earbuds
They may not have the same cultural style as AirPods, but Sony's wireless earbuds have a different trick up their sleeve: they pack Sony's fantastic noise-cancellation technology into the truely wireless buds along with great sound quality. Price: ~$230
Shark Socks
They're socks. They're sharks. They're shark socks!  What else do you need? Price: ~$10
Saga: Compendium One
Whether you're new to graphic novels or not, Saga: Compendium One is an incredible, sprawling tale told from the perspective of a child raised by parents of a war-torn universe. There's humor, action, loss, and the art is staggeringly beautiful. Price: ~$44
RAVPower Wireless charging stand
Wireless chargers are a great accessory for your phone, and RavPower's pads (whether you prefer a stand or a flat pad) are the best around. They charge fast, they come with a wall brick in the box, and they look great on your desk or nightstand. Price: ~$50
Teenage Engineering Pocket Operator 170
Teenage Engineering's first modular line is loads of fun to assemble, play with, and, perhaps most importantly, it's approachable for beginners. The 170 is an analog monophonic synthesizer with a programmable sequencer that comes with a 70-page illustrated manual, including several sample patch diagrams to get you started. Price: ~$399
Philips Hue with Bluetooth
Philip's Hue bulbs are a great place to start if you're looking to dip your toe into a smart light system. The company's latest Bluetooth-enabled smart bulbs make that even easier by removing the need to get a wired hub first. Price: ~$25
Solar Puff outdoor lamp
This is the perfect wireless lamp for when you want a little mood lighting on the go, outside, or wherever. It charges off a solar panel hidden on the bottom of the cube, and it flattens for easy packing. It also has an adjustable velcro strap that can be used for hanging or as a handle. Price: ~$30
Waterfield Designs Vitesse Cycling Musette
While its name might suggest that it's only meant for cyclists, this bag is a great way to carry around your everyday essentials. It's especially handy on vacation or any other time you might be looking for a simple, lightweight solution to your carrying needs. Price: ~$89
Oculus Quest
The Oculus Quest hits a sweet spot of power and convenience for virtual reality headsets, offering room-scale tracking and full-fledged hand controllers in a self-contained, user-friendly package. It's especially good paired with Beat Saber, a kinetic rhythm game played with virtual lightsabers, which is one of the best experiences VR has to offer. Price: ~$399
Roku Streaming Stick+
This stick offers a ton of power in a small package and at a small price, too. It lets you quickly give any television access to 4K HDR streaming video without another device cluttering up your entertainment center or dangling precariously off your wall-mounted screen. Price: ~$50
Kakao Friend Airpods case
AirPods cases are the new phone cases, meaning it's yet another gadget you can adorn with protective, cute covers that show off your personality. These Kakao characters are all the rage in Korea, with Ryan being an especially hot item. Price: ~$28
Mophie Powerstation XXL
There are some battery packs you can easily slip into a back pocket and carry around on a day-to-day basis. This isn't one of those. This is a brick of a battery that's designed for trips when you might need to recharge a phone or Nintendo Switch. Price: ~$78
Rode NT-USB
Add a podcast microphone to your 2020 starter kit. You're going to need it. This model has everything you need to record yourself, including a pop shield. It's both iPad and laptop compatible. Price: ~$169
Wemo Smart Plug
This smart plug is a great and inexpensive way to turn not-smart devices, like lamps, into something you can control with your preferred virtual assistant. It’s also a great first smart device for someone who isn’t sure if they really want or need a home full of smart devices. Price: ~$22
Mophie wireless car charger
Listening to your music or running Maps — or both — while you're driving can run down your phone's battery in no time. This vent mount will hold your phone safely while wirelessly keeping it charged. Price: ~$70
Apple iPad
If you're looking to give a gadget to someone who shuns plastic straws and water bottles, they might be happy to know that this is the first iPad to feature an enclosure made with 100 percent recycled aluminum. It's also got a bigger screen and can connect to Apple's Smart Keyboard. Price: ~$330
Hydro Flask 32 oz Wide Mouth
There isn’t much more you could ask for from a water bottle. It has a great capacity, a wide-mouth opening to help fill it faster, and it is insulated enough to keep hot drinks warm for 12 hours and cold drinks cold for 24 hours. Price: ~$40
Fitbit Charge 3
Fitbit makes a lot of fitness trackers, but the Charge 3 checks all of the boxes: great battery life, tons of fitness tracking options, sleep tracking, and a stylish look. It even does some basic smartwatch functions, like call and text notifications. Price: ~$149
Google Nest Hub
Google's Nest Hub smart display is many things: a TV-like device that can play YouTube videos, a command center for smart home gadgets, and, most importantly, an excellent digital photo frame for your Google Photos collection. Price: ~$130
iFixit Mako Driver Kit
When you are looking to fix a device, you don’t want to spend time looking for the right bit for your screwdriver. Not only does iFixit’s kit probably include every bit you could possibly need, but they are all nicely laid out. That makes it easy to see which one you need, grab it, and get back to what you were fixing. Price: ~$30
Inkkas Star Wars shoes
If you want to walk like an Ewok, then you may want to try out the Star Wars boots designed by Inkkas. The fabric footwear includes a variety of styles inspired by the sci-fi film series (for example, the Death Star High Top), and a percentage of each sale goes toward reforestation. Price: ~$149
Citizen Eco Drive Watches
Finding the right watch for you or a loved one can be challenging. Citizen's Eco-Drive watches look great, and they can last basically forever, thanks to their ability to recharge from the sun. If the watch dies, just stick it in sunlight for a few minutes to bring it back. Price: ~$180
Uniqlo Pile-lined hoodie
You can never have too many comfortable hoodies, and this one has a super soft interior, thanks to the pile lining. The cozy fabric will keep you extra warm this winter, and it works great as an extra layer under a coat or jacket if you have to go outside. Price: ~$40
Verge Merch
If you’re reading this, then you probably read The Verge, which means you probably know someone else who also reads The Verge. So they’d probably like a Verge shirt or hoodie as a gift — or maybe you would. Here is a discount code either way: HGG2019 Price: Varies
Credits
Editorial lead: Michael Moore
Art direction: William Joel
Photography: Amelia Holowaty Krales
Retouching and stop-motion animation: Michele Doying
Retouching: Daniel J. Decker
Contributors
Russell Brandom, Justine Calma, Dani Deahl, Cameron Faulkner, Chaim Gartenberg, Loren Grush, Barbara Krasnoff, Dami Lee, Andru Marino, Jay Peters, Jon Porter, Adi Robertson, Dan Seifert, Nick Statt, Kara Verlaney, Adia Watts, and Cory Zapatka.
Special Thanks
Grayson Blackmon, Ashley Carman, Becca Farsace, Megan Farokhmanesh, Mary Beth Griggs, Kaitlin Hatton, Helen Havlak, Andrew Hawkins, Brennan King, Sean O’Kane, Sarah Smithers, Bijan Stephen, and Sarah Bishop Woods.
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We just release ZPTKit 0.1, a library to integrate Zope Page Templates into Webware. It's the first open source software that Imaginary Landscape has released; there's a certain challenge to getting something out there, since it is true that this doesn't offer any immediate benefit to the company. Though at the same time this sort of infrastructure (since this is just a library, it doesn't do anything) is the kind of thing where open source benefits require the least investment -- by both using open tools and building open tools, it gets us to produce a solid foundation of software. And that is very beneficial, without any question -- all the difficulty in open sourcing something is almost completely in polishing the software so it's fit for external consumption. But in many ways it is to an organization's disadvantage to build things that are obscure and require undocumented knowledge. So it's good process.
Imaginary Landscape has been using the library internally for maybe six months -- as soon as we developed applications in Webware (before we just used Zope), I wanted to keep some common technology, and ZPT was a good candidate -- it's already packaged separately, it's a part of the system (templates) that gets exposed to lots of people in the organization, and it's just a good templating system. A little verbose at times, but it always lets me do what I need to do, which is far more important.
I've been very happy with out it has worked, and how it both fits into the structure of the applications, and helps direct that structure. It encourages model-view-controller design without being heavy-handed or even explicit about it; it's just the natural way applications evolve when the tools are there. I hope to work out a basic framework of a Webware application, that is less free-form than the standard examples (along the lines of tell me what to do); but that's something we're still working out internally, even if we've gotten closer.
Well, next off to PyCon. I'll be at the WSGIKit Sprint on Monday and Tuesday; I'll be in DC on Saturday and Sunday, but I thought I'd actually see a little of the city this year, and Emily will also be there (she's in Baltimore right now attending the yearly conference for National Council on Education for the Ceramic Arts).


Man, 26, drowns at National Stadium, Surulere
by NANOne Sodiq Yusuf, 26, of No. 26, Horgan Bassey Street, Surulere, has said to have drowned at National Stadium, Surulere.
The police in Lagos on Sunday said that a 26-year-old man, Sodiq Yusuf, had drowned inside the National Stadium swimming pool, Surulere.
Lagos Police Public Relations Officer (PPRO), DSP Bala Elkana, said in a statement that a team of policemen was immediately mobilised to the scene.
He said that the victim was rescued and rushed to Randle General Hospital, Surulere, where he later died.
“The corpse has been deposited at the Mainland General Hospital morgue, Yaba for autopsy.
“Investigation is ongoing,” he said.
Elkana also said that the police and other emergency agencies rescued 11 passengers involved in a boat mishap at Itun Àgan community in Amuwo Odofin area of the state.
Elkana said that 13 passengers were on board a wooden boat fitted with 30HP Yamaha Engine, operated by one Mr Adesuyi John.
“The wooden boat allegedly collided with an NPA TUG Boat with the inscription: ‘Lárana and No 9252723,’ at Itun Àgan area, Amuwo Odofin.
“Consequently, the wooden boat capsised and the passengers got drowned.
“However, teams of marine policemen, firefighters, Lagos State Emergency Management Agency (LASEMA) and other agencies swiftly mobilised to the scene.
“Eleven of the passengers were rescued alive while two others are still missing,” he said.
Elkana, however, said that a search and rescue operation was still ongoing.


Codeine cough syrup | case study of Nigeria's youth
Codeine cough syrup is causing a plague of addiction across youth in Nigeria. This plague is a serious one, it’s biting everybody up, going from one home to another. If you think you are safe you are not. those hooked risk organ failure and even descent into madness. Many of these addicts takes months and even years in withdrawal syndrome. Addicts are being clapped in chains because syrup has turned them into thugs.
It is high time we uncover the crooks, I call on all agencies at all level; journalist, government officials, military personnel to make it a role to expose professionals putting industrial quantities of syrup in Nigeria’s streets. “these products I know if I have one million cartons, I can sell it in a week.”
We would take you into a criminal underworld where pharmaceutical company managers act like drug dealers. Where there are lots of school kids, as soon as they get a taste for it, they keep on demanding for more. Thanks to all anti-drugs squad across Nigeria who have put their lives on the frontline against the war on syrup. The question that keep coming to my mind is “what is the government doing to stop the people behind this?” This drugs are not coming from the moon; they are not coming from under the sea. They are manufactured somewhere. they are transported from one place to another. Are we saying we don’t know? Come on! People all over the world are addicted to cough syrup with codeine. It’s a medicine that has become a street drug.
 On the social media you will find hundreds of videos of people high. It’s in America, it’s in south Africa, it’s in my country Nigeria. In just two states the government says 3.0 million bottles are consumed everyday single day. A lot of people don’t know what they are getting into; cough syrup is very addictive, it will you to places you don’t want to go. SAY NO TO COUGH SYRUP.
there is alot of potential in this country,but it is unfornute that our leaders give little attention to the HDI the human development index of our country is facing death, well, our political have lots of credit in making projects,but many of this projects have little of nothing to do with educating and equipping the youth, few month i wrote an article studing to be unemployed | inside nigeria youth ,our politician have forgetten that it by thier vote that they are where they are now.
it’s so bad that our government is sending armies of drug agents to destroy syrup, they raid our cities in dead of night. The national drug law and enforcement agency or NDLEA are out on the streets every week in northern Nigeria. Squads of agent ready to take on heavily armed drug gangs. The SWAT team storms steadily on hotel is looking for dealers and users. This cough syrup is usually mixed with soft drinks.
am a young writer, with no political affliation,so am writing with no in mind,apart from those thousands of youths hooked in the chains of this "sweet" substance that kills gradually,siphoning every dime the vitmin. feeling to do one more time,this also applys to any other kind of addiction. the huge[feeling] of satisfing one's pleasure is a global diseas. this forms the foundation of many medical disorders [obesity,diabetes e.t.c]


--- layout: post title: Sh*t Runners Say date: 2012-02-23 09:47:37.000000000 +00:00 tags: - humour type: post published: true ---
Runners are strange creatures.  Along with this comes all the banter about these shoes, that injury, and the next best running gadget or race you must run.
Recently talk has turned to barefoot and minimalist running and along with it a whole new topic of discussion for those long Sunday runs. As with anything new or different, you always get the "experts" and those who get a bit over enthusiastic and this is what Steven Sashen of Invisible Shoes has capitalised on for this first video, "Sh*t Barefoot Runners Say"...
Of course, there's also the flip side, which Steven has just captured in his sequel... "Sh*t Runners Say to Barefoot Runners"...
I don't think I've said any of the things in the first, but I've definitely been the recipient of many of the comments in the second.


Automate
we have a services and maintenance team of rich experienced engineers and technicians, we are willing to serve you better. SinCos is committed to after sales service as long as the machines are with our esteemed customer. We are committed to our unfailing after sales support, at all levels.
Machinery
At SinCos we are here to solve your production problems with cost effective manner with our AI rich automation algorithms. we provided machine learning driven automation, which make your work too faster than manually. In other words we provide full automate solutions to our valuable clients.


Comparing Arrays and Hashes
August 10th, 2015
What are Arrays and Hashes?
Arrays and Hashes are both used in Ruby in order to store a bunch of data! While the syntax to write out Arrays and Hashes might be different, they are both used when you want to be able to store a significant ( or just a little ) data so that you can access the information within the Array or Hashes whenever you want. How do you access the data stored in Arrays and Hashes? Good question! Arrays and Hashes are both indexed collections. What do I mean by that? Both can be accessible using certain syntax. With Arrays, the indexes are integers, where the first value in an array starts from the index "0", and goes incrementally up by 1. For Hashes, you can access the "values" using "keys" that are associated with each value in a Hash.
Before I go any further, let me show you how Hashes and Arrays look like.
Ex of an Array:
array = [] <== this is an empty array with no data.
array = ['hello', 'bye', 9] <== as you can see, you can store all types of different objects in an array. Strings and integers are included in the example above, but you can also store any object in Ruby (Hashes, other Arrays, methods!).
Ex of Hashes:
hash = {} - An empty hash
hash = {:ramen => 5, :rice => 1, :beef => 10} - keys and symbols. The key starts with ":" followed by the key name, and it points to the value associated with each key.
Now that you know how arrays and Hashes look like, let me show you how you would create them in Ruby. Both arrays and Hashes can be created using literal and constructor notations.
Arrays:
Array = []
Array.new
Hashes:
hash = Hash.new(0)
hash = {}
As you see from the examples above, Hashes and Arrays are great ways to store a large amount of information. You can easily iterate over both, making life a lot easier for the programmer!


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Various images from travels and adventures


except (AttributeError, KeyError):
// AttributeError if state is None
// KeyError if STATE_ATTR_NEXT_RISING does not exist
return None
def setup(hass, config):
Tracks the state of the sun.
Returns the local datetime object of the next sun rising.
utc_next = next_rising_utc(hass, entity_id)
return dt_util.as_local(utc_next) if utc_next else None
def next_rising_utc(hass, entity_id=None):


Gold steady amid mixed signals on U.S.-China trade talks
by ReutersGold prices were little changed on Friday
as a report of China’s efforts to smooth the way for trade talks
with the United States offset worries that an interim deal might
not occur until next year.
FUNDAMENTALS
* Spot gold was flat at $1,464.99 per ounce by 0106
GMT, while U.S. gold futures inched higher 0.05% to
$1,464.30.
* China has invited top U.S. trade negotiators for a new
round of face-to-face talks in Beijing amid continued efforts to
strike at least a limited deal, the Wall Street Journal reported
on Thursday, citing unnamed sources.
* China will strive to reach the agreement with the United
States as both sides keep communication channels open, the
Chinese commerce ministry said.
* Washington passed two bills earlier this week intended to
support protesters in Hong Kong and send a warning to China on
its human rights policies.
* Asian equities rose but gains were limited by persistent
worries over the trade dispute.
* U.S. President Donald Trump’s former Russia adviser Fiona
Hill urged lawmakers in the House of Representatives impeachment
inquiry on Thursday not to promote “politically driven
falsehoods” that cast doubt on Russia’s interference in the 2016
U.S. election.
* The number of Americans filing applications for
unemployment benefits was unexpectedly unchanged at a five-month
high last week, suggesting some softening in the labor market.
* Japan’s annual core consumer inflation ticked up only
marginally in October despite the boost from a sales tax hike
during the month.
* Silver was little changed at $17.10 per ounce,
palladium was flat at $1,760.76 per ounce and platinum
edged down 0.4%, to $911.66.
* A surge in investment buying will push the global platinum
market into a small deficit this year – the first since 2016 –
but a hefty surplus will return in 2020, the World Platinum
Investment Council said.
DATA/EVENTS (GMT)
0700 Germany GDP Detailed QQ SA, YY NSA Q3
0815 France Markit Mfg, Serv, Comp Flash PMIs Nov
0830 Germany Markit Mfg, Serv, Comp Flash PMIs Nov
0900 EU Markit Mfg, Serv, Comp Flash PMIs Nov
1445 US Markit Mfg, Serv, Comp Flash PMIs Nov
1500 US U Mich Sentiment Final Nov
(Reporting by Diptendu Lahiri in Bengaluru; Editing by
Subhranshu Sahu)


#include <EventStreamClient.h>
◆ ClientConnection() [1/3]
◆ ~ClientConnection()
| Aws::Eventstreamrpc::ClientConnection::~ClientConnection |
( |
| ) |
|
|
noexcept |
◆ ClientConnection() [2/3]
| Aws::Eventstreamrpc::ClientConnection::ClientConnection |
( |
const ClientConnection & |
| ) |
|
|
deletenoexcept |
◆ ClientConnection() [3/3]
| Aws::Eventstreamrpc::ClientConnection::ClientConnection |
( |
ClientConnection && |
rhs | ) |
|
|
noexcept |
◆ Close()
| void Aws::Eventstreamrpc::ClientConnection::Close |
( |
| ) |
|
|
noexcept |
◆ Connect()
◆ IsOpen()
| bool Aws::Eventstreamrpc::ClientConnection::IsOpen |
( |
| ) |
const |
|
inlinenoexcept |
◆ NewStream()
◆ operator bool()
| Aws::Eventstreamrpc::ClientConnection::operator bool |
( |
| ) |
const |
|
inlinenoexcept |
- Returns
- true if the instance is in a valid state, false otherwise.
◆ operator=() [1/2]
◆ operator=() [2/2]
◆ SendPing()
◆ SendPingResponse()
◆ ClientContinuation
◆ ClientOperation::Close
The documentation for this class was generated from the following files:
- /Users/jkl/Documents/AWS/sdk-cpp-workspace/aws-iot-device-sdk-cpp-v2/eventstream_rpc/include/aws/eventstreamrpc/EventStreamClient.h
- /Users/jkl/Documents/AWS/sdk-cpp-workspace/aws-iot-device-sdk-cpp-v2/eventstream_rpc/source/EventStreamClient.cpp


|
Class Summary |
| AddressVerificationTaxProcessorTaxCalculator |
An extension of the TaxProcessorTaxCalculator which optionally verifies
the shipping address about to be taxed, the billing address about to be taxed,
or both. |
| AmountInfo |
Represents price information about an object. |
| AvailableShippingMethodsDroplet |
This Dynamo Servlet Bean is used to display avalable shipping methods for
a particular shipping group. |
| ClosenessQualifierEvaluator |
This class serves as the base class for several specific types of
ClosenessQualiferEvaluators: ItemClosenessQualifierEvaluator,
OrderClosenessQualifierEvaluator, ShippingClosenessQualifierEvaluator,
and TaxClosenessQualifierEvaluator. |
| ConfigurableItemPriceCalculator |
A calculator which calculates the list price of a configurable item
and sets the itemPriceInfo to be that amount. |
| Constants |
This contains all of the non-public constants used by the package,
including messsage strings read from the resource file. |
| DetailedItemPriceInfo |
Represents a breakdown of a CommerceItem's price. |
| DetailedItemPriceTools |
This class provides various methods for manipulating
DetailedItemPriceInfos. |
| DiscountCalculatorService |
A GenericService version of a discount calculator. |
| DoubleRangeShippingCalculator |
An abstract shipping calculator that determines the shipping price based on comparing a value from the
ShippingGroup to a series of ranges. |
| FilteredCommerceItem |
Represents a CommerceItem that's currently participating in a rules evaluation
in the Qualifier. |
| FilteredCommerceItemPropertyMapper |
This class describes a DynamicPropertyMapper for FilteredCommerceItems. |
| FixedPriceShippingCalculator |
A shipping calculator that sets the shipping amount to a fixed price. |
| ItemClosenessQualifierEvaluator |
This class evaluates closenessQualifiers related to item promotions. |
| ItemDiscountCalculator |
Calculates the new price for an item or items based on a given pricing model. |
| ItemListPriceCalculator |
A calculator which determines the list price of an item and sets
the itemPriceInfo to be that amount. |
| ItemPriceCalculator |
Superclass for all CommerceItem calculators. |
| ItemPriceInfo |
Contains information about a CommerceItem's price. |
| ItemPricingDroplet |
An abstract class which is used as the foundation for pricing items and displaying
the results to the user. |
| ItemPricingEngineImpl |
An ItemPricingEngine implementation which computes the price for an order. |
| ItemSalePriceCalculator |
A calculator which determines the sale price of an item and discounts
the itemPriceInfo to that amount, while at the same time maintaining the audit trail of
the ItemPriceInfo. |
| NoTaxCalculator |
Creates a new TaxPriceInfo that specifies no tax. |
| OrderClosenessQualifierEvaluator |
This class evaluates closenessQualifiers related to order promotions. |
| OrderDiscountCalculator |
Calculates OrderPriceInfos for Orders which the calculator is given. |
| OrderPriceInfo |
Contains the following information about the price of an Order:
taxableShippingItemsSubtotalPriceInfos is a map of shipping group IDs to OrderPriceInfos
that describe the prices of the totals of the taxable items in the order's shippinggroups. |
| OrderPricingEngineImpl |
An OrderPricingEngine implementation which computes the price for an order. |
| OrderSubtotalCalculator |
Computes the rawSubtotal and amount of an OrderPriceInfo
that corresponds to
the input Order. |
| PriceChanged |
This event gets generated everytime an order is repriced and the
price changed. |
| PriceEachItemDroplet |
This Dynamo Servlet Bean is used to price a collection of items. |
| PriceItemDroplet |
This Dynamo Servlet Bean is used to price a single item. |
| PriceRangeShippingCalculator |
A shipping calculator that determines the shipping price based on the subtotal of all the items
in the shipping group. |
| PricingAdjustment |
Represents an element of a price's audit trail. |
| PricingCommerceItem |
A simple CommerceItem that is used just as a placeholder while pricing items. |
| PricingEngineService |
A GenericService version of a PricingEngine. |
| PricingModelComparator |
A comparator used for sorting pricing models by priority. |
| PricingModelHolder |
A session-scoped component which is intended to hold all the active promotions (aka pricing models)
of a user while they are using the web application. |
| PricingModelProperties |
Stores names of pricing model properties, so that they pricing model property names
may be internationalized or otherwise changed to suit a particular installation. |
| PricingServices |
Exposes pricing functionality for use in web services. |
| PricingTools |
A class which can perform a variety of pricing functions across different types of
PricingEngine. |
| PromotionClosenessMessage |
This class is the base for two types of JMS messages:
- A PromotionClosenessQualificationEvent indicates that an order has met a
closenessQualification of a given promotion. |
| PropertyRangeShippingCalculator |
A shipping calculator that determines the shipping price based on the summing the values of
a specific property of all the items in the shipping group. |
| QualifiedItem |
Holds information about a CommerceItem that has qualified for a discount. |
| Qualifier |
A Helper class for discount calculators. |
| ShipItemRelPriceDroplet |
Given a shipping group commerce item relationship, return the amount. |
| ShippingCalculatorImpl |
This abstract class is a starting point for some general functionality on calculating
pricing for shipping groups. |
| ShippingClosenessQualifierEvaluator |
This class evaluates closenessQualifiers related to shipping promotions. |
| ShippingDiscountCalculator |
Calculates ShippingPriceInfos for ShippingGroups which the calculator is given. |
| ShippingPriceInfo |
Contains information about the price of shipping the input ShippingGroup. |
| ShippingPricingEngineImpl |
A ShippingPricingEngine implementation which computes the shipping price for an order. |
| TaxClosenessQualifierEvaluator |
This class evaluates closenessQualifiers related to tax promotions. |
| TaxDiscountCalculator |
Calculates TaxPriceInfos for Orders which the calculator is given. |
| TaxPriceInfo |
Represents tax price information. |
| TaxPricingEngineImpl |
A TaxPricingEngine implementation which computes the tax for an order. |
| TaxProcessorTaxCalculator |
Uses the atg.payment.tax package to calculate tax for an order. |
| WeightRangeShippingCalculator |
This calculator will calculate shipping costs based upon the total weight of an
order. |


File.Exists returns true if a file by the name of pathName exists. It will return false if pathName is a directory.
Details
If the File.Exists returns false, you can examine Error.Last or Error.LastMsg for more information (i.e. whether the path failed or the file was simply not found).
Example
This program loops until the user types in a path name that either doesn't already exist or is allowed to be overwritten.
var pathName : string
var choice : string
loop
put "Enter file name to write results to" ..
get pathName
if File.Exists (pathName) then
put "Overwrite ", pathName, "?" ..
get choice
exit when choice = "y"
else
exit
end if
end loop
Execute
An example program is available that creates a file in the current
directory, tests for its existence using File.Exists and
deletes the file using File.Delete.
Status
Exported qualified.
This means that you can only call the function by calling File.Exists, not by calling Exists.


This nested loop overrides the index variable of its parent.
And companion warning "This parent loop has its index variable overridden."
for((i=0; i<10; i++))
do
for i in *
do
echo "$i"
done
done
for((i=0; i<10; i++))
do
for j in *
do
echo "$j"
done
done
When nesting loops, especially arithmetic for loops, using the same loop variable can cause unexpected results.
In the problematic code, i
will contain the last filename from the inner loop, which will be interpreted as a value in the next iteration out the outer loop. This results in either an infinite loop or a syntax error, depending on whether the last filename is a valid shell variable name.
In nested for-in loops, variable merely shadow each other and won't cause infinite loops or syntax errors, but reusing the variable name is rarely intentional.
None.


Enter your new dogs name here to see what we think!
So you want do adopt a puppy?
Our Mission
Did you ever hear the tragedy of Darth Plagueis The Wise? I thought not. It's not a story the Jedi would tell you. It's a Sith legend. Darth Plagueis was a Dark Lord of the Sith, so powerful and so wise he could use the Force to influence the midichlorians to create life… He had such a knowledge of the dark side that he could even keep the ones he cared about from dying.

We greatly appreciate any donations recieved. 100% of our donations go to our animals!


The Android Manifest is an XML file which contains important metadata about the Android app. This includes the package name, activity names, main activity (the entry point to the app), configurations, Android version support, hardware features support, and permissions.
For more information about the Android Manifest file, refer to the Android Developer documentation on Android Manifests.
When building your app, Unity automatically generates the Android Manifest, following the steps below:
Unity takes the main Android Manifest.
Unity finds all the Android Manifests of your plug-ins (AARs and Android Libraries).
Manifests from plug-ins are merged into the main Manifest using Google’s manifmerger class.
Unity modifies the Manifest, automatically adding permissions, configuration options, features used, and other information to the Manifest.
Although Unity generates a correct Manifest for you, in some cases you might want direct control over its contents.
To use an Android Manifest that you have created outside of Unity, import your Android Manifest file to the following location: Assets/Plugins/Android/AndroidManifest.xml. This overrides the default Unity-created Manifest.
In this situation, Android Libraries’ Manifests are later merged into your main Manifest, and the resulting Manifest is still tweaked by Unity to make sure the configuration is correct. For full control of the Manifest, including permissions, you need to export the Project and modify the final Manifest in Android Studio.
Unity automatically adds the necessary permissions to the Manifest based on the Player Settings and Unity APIs that your app calls from the script. For example:
Network classes add the INTERNET
permission
Using vibration (such as Handheld.Vibrate) adds VIBRATE
The InternetReachability property adds ACCESS_NETWORK_STATE
Location APIs (such as LocationService) adds ACCESS_FINE_LOCATION
WebCamTexture APIs add CAMERA
permission
The Microphone class adds RECORD_AUDIO
For more information about permissions, see the Android Manifest Permissions page of the Android Developer documentation.
Note that if your plug-ins require a permission by declaring it in their Manifests, the permission is automatically be added to the resulting Android Manifest during the merge stage. Any Unity APIs called by the plug-ins also contribute to the permission list.
If your app is running on a device with Android 6.0 (Marshmallow) or later and also targets Android API level 23 or higher, your app uses the Android Runtime Permission System.
The Android Runtime Permission System asks the app’s user to grant permissions while the app is running, instead of when the app is first installed. App users can usually grant or deny each permission when the app needs them while the app is running (for example, requesting camera permission before taking a picture). This allows an app to run with limited functionality without permissions.
Unity does not support the Runtime Permission System, so your app prompts the user to allow what Android calls “dangerous” permissions on startup. See Android’s documentation on dangerous permissions for more information.
Prompting your user to allow dangerous permissions is the only way to ensure plug-ins don’t cause crashes when they are missing a permission. However, if you don’t want your Unity Android app to ask for permissions on startup, you can add the following to your Manifest in either the Application or Activity sections.
<meta-data android:name="unityplayer.SkipPermissionsDialog" android:value="true" />
Adding this completely suppresses the permission dialog shown on startup, but you must handle runtime permissions carefully to avoid crashes. This method is only recommended for advanced Android app developers.
For further information about the Runtime Permission System and handling permissions, see the Requesting Permissions section of the Android Developer documentation.
To examine the final Android Manifest that Unity has generated for your app, open the Temp/StagingArea/AndroidManifest.xml file after you have built your Project but before exiting the Unity Editor.
The Manifest is stored in binary format in the output package (APK). To check the contents of a Manifest inside an APK, you can use the Android Studio APK Analyzer or another third-party tool (such as Apktool).


SECRET PARTNER, THE (director/writer: Basil Dearden; screenwriters: David Pursall/Jack Seddon; cinematographer: Harry Waxman; editor: Ray Poulton; cast: Stewart Granger (John Brent), Haya Harareet (Nicole Brent), Bernard Lee (Detective Superintendent Hanbury), Norman Bird (Dr. Ralph Beldon), Hugh Burden (Charles Standish), Lee Montague (Detective Inspector Tom Henderson), Melissa Stribling (Helen Standish), Conrad Phillips (Dr. Alan Richford), John Lee (Clive Lang); Runtime: 91; MGM; 1961-UK)
Reviewed by Dennis Schwartz
An atmospheric, thrilling whodunit, that is full of surprises, is fast-paced, and is well-acted.  She claims he must have another woman, as he is having financial difficulties. But it's also clear she's fooling around with her interior decorator, Clive Lang (John Lee), and with the medical doctor at the shipping company, Dr. Alan Richford (Phillips).
Brent's financial difficulties abound because he's being blackmailed by a sleazy looking, alcoholic dentist, Ralph Beldon (Bird). He was a prison dentist when Brent served time as John Wilson and he doesn't want his shipping company to know that, therefore he continues to pay the blackmail.
The plot gets twisted when the dentist is visited by a mysterious hooded stranger, with a disguised voice, who threatens him to follow orders or else. He relates that he knows he's blackmailing Brent; he offers him big money if he gets Brent under sedation of a truth serum to reveal the combination to his company's safe and to also get an impression of the key he has to the room where the safe is kept. Things become complex in a Hitchcockian way when the heist works and $130,000 is robbed.
Superintendent Frank Hanbury (Bernard Lee) is soon to retire, turning over his job to his assistant, Tom Henderson (Montague), and he wants to make his swan song clean--leaving no loose ends. But the case puzzles him as all the clues so easily point to Brent, it's as if the ex-con has been framed. Therefore the suspicions go to the wife and any of her lovers.
The complexity of the case made for a diverting mystery tale, as the fun is in trying to unravel who pulled off the heist and who is the secret partner.
REVIEWED ON 9/14/2001 GRADE: B
Dennis Schwartz: "Ozus' World Movie Reviews"
http://www.sover.net/~ozus
<EMAIL_ADDRESS>© ALL RIGHTS RESERVED DENNIS SCHWARTZ
========== X-RAMR-ID: 29456 X-Language: en X-RT-SourceID: 873 X-RT-AuthorID: 1315 X-RT-RatingText: B
The review above was posted to the
rec.arts.movies.reviews newsgroup (de.rec.film.kritiken for German reviews).
The Internet Movie Database accepts no responsibility for the contents of the
review and has no editorial control. Unless stated otherwise, the copyright
belongs to the author.
Please direct comments/criticisms of the review to relevant newsgroups.
Broken URLs inthe reviews are the responsibility of the author.
The formatting of the review is likely to differ from the original due
to ASCII to HTML conversion.
Related links: index of all rec.arts.movies.reviews reviews


WARNING: Some coeficients and limitations aren't used in the formula, so the calibers fall way further that they should. I will add wind and humidity later in a further version.


public interface TaskService
Task
and form related operations.| Modifier and Type | Method and Description |
|---|---|
void |
addCandidateGroup(String taskId,
String groupId)
Convenience shorthand for
addGroupIdentityLink(String, String, String) ; with type IdentityLinkType.CANDIDATE |
void |
addCandidateUser(String taskId,
String userId)
Convenience shorthand for
addUserIdentityLink(String, String, String) ; with type IdentityLinkType.CANDIDATE |
Comment |
addComment(String taskId,
String processInstanceId,
String message)
Add a comment to a task and/or process instance.
|
Comment |
addComment(String taskId,
String processInstanceId,
String type,
String message)
Add a comment to a task and/or process instance with a custom type.
|
void |
addGroupIdentityLink(String taskId,
String groupId,
String identityLinkType)
Involves a group with a task.
|
void |
addUserIdentityLink(String taskId,
String userId,
String identityLinkType)
Involves a user with a task.
|
void |
claim(String taskId,
String userId)
Claim responsibility for a task: the given user is made assignee for the task.
|
void |
complete(String taskId)
Called when the task is successfully executed.
|
void |
complete(String taskId,
Map<String,Object> variables)
Called when the task is successfully executed,
and the required task parameters are given by the end-user.
|
void |
complete(String taskId,
Map<String,Object> variables,
boolean localScope)
Called when the task is successfully executed,
and the required task paramaters are given by the end-user.
|
void |
complete(String taskId,
Map<String,Object> variables,
Map<String,Object> transientVariables)
Similar to
complete(String, Map) , but allows to set transient variables too. |
Attachment |
createAttachment(String attachmentType,
String taskId,
String processInstanceId,
String attachmentName,
String attachmentDescription,
InputStream content)
Add a new attachment to a task and/or a process instance and use an input stream to provide the content
|
Attachment |
createAttachment(String attachmentType,
String taskId,
String processInstanceId,
String attachmentName,
String attachmentDescription,
String url)
Add a new attachment to a task and/or a process instance and use an url as the content
|
NativeTaskQuery |
createNativeTaskQuery()
Returns a new
NativeQuery for tasks. |
TaskQuery |
createTaskQuery()
Returns a new
TaskQuery that can be used to dynamically query tasks. |
void |
delegateTask(String taskId,
String userId)
Delegates the task to another user.
|
void |
deleteAttachment(String attachmentId)
Delete an attachment
|
void |
deleteCandidateGroup(String taskId,
String groupId)
Convenience shorthand for
deleteGroupIdentityLink(String, String, String) ; with type IdentityLinkType.CANDIDATE |
void |
deleteCandidateUser(String taskId,
String userId)
Convenience shorthand for
deleteUserIdentityLink(String, String, String) ; with type IdentityLinkType.CANDIDATE |
void |
deleteComment(String commentId)
Removes an individual comment with the given id.
|
void |
deleteComments(String taskId,
String processInstanceId)
Removes all comments from the provided task and/or process instance
|
void |
deleteGroupIdentityLink(String taskId,
String groupId,
String identityLinkType)
Removes the association between a group and a task for the given identityLinkType.
|
void |
deleteTask(String taskId)
Deletes the given task, not deleting historic information that is related to this task.
|
void |
deleteTask(String taskId,
boolean cascade)
Deletes the given task.
|
void |
deleteTask(String taskId,
String deleteReason)
Deletes the given task, not deleting historic information that is related to this task..
|
void |
deleteTasks(Collection<String> taskIds)
Deletes all tasks of the given collection, not deleting historic information that is related
to these tasks.
|
void |
deleteTasks(Collection<String> taskIds,
boolean cascade)
Deletes all tasks of the given collection.
|
void |
deleteTasks(Collection<String> taskIds,
String deleteReason)
Deletes all tasks of the given collection, not deleting historic information that is related to these tasks.
|
void |
deleteUserIdentityLink(String taskId,
String userId,
String identityLinkType)
Removes the association between a user and a task for the given identityLinkType.
|
Attachment |
getAttachment(String attachmentId)
Retrieve a particular attachment
|
InputStream |
getAttachmentContent(String attachmentId)
Retrieve stream content of a particular attachment
|
Comment |
getComment(String commentId)
Returns an individual comment with the given id.
|
List<Comment> |
getCommentsByType(String type)
All comments of a given type.
|
Event |
getEvent(String eventId)
Returns an individual event with the given id.
|
List<IdentityLink> |
getIdentityLinksForTask(String taskId)
Retrieves the
IdentityLink s associated with the given task. |
List<Attachment> |
getProcessInstanceAttachments(String processInstanceId)
The list of attachments associated to a process instance
|
List<Comment> |
getProcessInstanceComments(String processInstanceId)
The comments related to the given process instance.
|
List<Comment> |
getProcessInstanceComments(String processInstanceId,
String type)
The comments related to the given process instance.
|
List<Task> |
getSubTasks(String parentTaskId)
The list of subtasks for this parent task
|
List<Attachment> |
getTaskAttachments(String taskId)
The list of attachments associated to a task
|
List<Comment> |
getTaskComments(String taskId)
The comments related to the given task.
|
List<Comment> |
getTaskComments(String taskId,
String type)
The comments related to the given task of the given type.
|
List<Event> |
getTaskEvents(String taskId)
The all events related to the given task.
|
Object |
getVariable(String taskId,
String variableName)
get a variables and search in the task scope and if available also the execution scopes.
|
<T> T |
getVariable(String taskId,
String variableName,
Class<T> variableClass)
get a variables and search in the task scope and if available also the execution scopes.
|
List<org.activiti.engine.impl.persistence.entity.VariableInstance> |
getVariableInstancesLocalByTaskIds(Set<String> taskIds)
get all variables and search only in the task scope.
|
Object |
getVariableLocal(String taskId,
String variableName)
checks whether or not the task has a variable defined with the given name.
|
<T> T |
getVariableLocal(String taskId,
String variableName,
Class<T> variableClass)
checks whether or not the task has a variable defined with the given name.
|
Map<String,Object> |
getVariables(String taskId)
get all variables and search in the task scope and if available also the execution scopes.
|
Map<String,Object> |
getVariables(String taskId,
Collection<String> variableNames)
get values for all given variableNames and search only in the task scope.
|
Map<String,Object> |
getVariablesLocal(String taskId)
get all variables and search only in the task scope.
|
Map<String,Object> |
getVariablesLocal(String taskId,
Collection<String> variableNames)
get a variable on a task
|
boolean |
hasVariable(String taskId,
String variableName)
checks whether or not the task has a variable defined with the given name, in the task scope and if available also the execution scopes.
|
boolean |
hasVariableLocal(String taskId,
String variableName)
checks whether or not the task has a variable defined with the given name, local task scope only.
|
Task |
newTask()
Creates a new task that is not related to any process instance.
|
Task |
newTask(String taskId)
create a new task with a user defined task id
|
void |
removeVariable(String taskId,
String variableName)
Removes the variable from the task.
|
void |
removeVariableLocal(String taskId,
String variableName)
Removes the variable from the task (not considering parent scopes).
|
void |
removeVariables(String taskId,
Collection<String> variableNames)
Removes all variables in the given collection from the task.
|
void |
removeVariablesLocal(String taskId,
Collection<String> variableNames)
Removes all variables in the given collection from the task (not considering parent scopes).
|
void |
resolveTask(String taskId)
Marks that the assignee is done with this task and that it can be send back to the owner.
|
void |
resolveTask(String taskId,
Map<String,Object> variables)
Marks that the assignee is done with this task providing the required
variables and that it can be sent back to the owner.
|
void |
resolveTask(String taskId,
Map<String,Object> variables,
Map<String,Object> transientVariables)
Similar to
resolveTask(String, Map) , but allows to set transient variables too. |
void |
saveAttachment(Attachment attachment)
Update the name and decription of an attachment
|
void |
saveTask(Task task)
Saves the given task to the persistent data store.
|
void |
setAssignee(String taskId,
String userId)
Changes the assignee of the given task to the given userId.
|
void |
setDueDate(String taskId,
Date dueDate)
Changes the due date of the task
|
void |
setOwner(String taskId,
String userId)
Transfers ownership of this task to another user.
|
void |
setPriority(String taskId,
int priority)
Changes the priority of the task.
|
void |
setVariable(String taskId,
String variableName,
Object value)
set variable on a task.
|
void |
setVariableLocal(String taskId,
String variableName,
Object value)
set variable on a task.
|
void |
setVariables(String taskId,
Map<String,? extends Object> variables)
set variables on a task.
|
void |
setVariablesLocal(String taskId,
Map<String,? extends Object> variables)
set variables on a task.
|
void |
unclaim(String taskId)
A shortcut to
claim(java.lang.String, java.lang.String) with null user in order to unclaim the task |
Task newTask()
saveTask(Task)
'manually'.void saveTask(Task task)
task
- the task, cannot be null.void deleteTask(String taskId)
taskId
- The id of the task that will be deleted, cannot be null. If no task
exists with the given taskId, the operation is ignored.ActivitiObjectNotFoundException
- when the task with given id does not exist.ActivitiException
- when an error occurs while deleting the task or in case the task is part
of a running process.void deleteTasks(Collection<String> taskIds)
taskIds
- The id's of the tasks that will be deleted, cannot be null. All
id's in the list that don't have an existing task will be ignored.ActivitiObjectNotFoundException
- when one of the task does not exist.ActivitiException
- when an error occurs while deleting the tasks or in case one of the tasks
is part of a running process.void deleteTask(String taskId, boolean cascade)
taskId
- The id of the task that will be deleted, cannot be null. If no task
exists with the given taskId, the operation is ignored.cascade
- If cascade is true, also the historic information related to this task is deleted.ActivitiObjectNotFoundException
- when the task with given id does not exist.ActivitiException
- when an error occurs while deleting the task or in case the task is part
of a running process.void deleteTasks(Collection<String> taskIds, boolean cascade)
taskIds
- The id's of the tasks that will be deleted, cannot be null. All
id's in the list that don't have an existing task will be ignored.cascade
- If cascade is true, also the historic information related to this task is deleted.ActivitiObjectNotFoundException
- when one of the tasks does not exist.ActivitiException
- when an error occurs while deleting the tasks or in case one of the tasks
is part of a running process.void deleteTask(String taskId, String deleteReason)
taskId
- The id of the task that will be deleted, cannot be null. If no task
exists with the given taskId, the operation is ignored.deleteReason
- reason the task is deleted. Is recorded in history, if enabled.ActivitiObjectNotFoundException
- when the task with given id does not exist.ActivitiException
- when an error occurs while deleting the task or in case the task is part
of a running processvoid deleteTasks(Collection<String> taskIds, String deleteReason)
taskIds
- The id's of the tasks that will be deleted, cannot be null. All
id's in the list that don't have an existing task will be ignored.deleteReason
- reason the task is deleted. Is recorded in history, if enabled.ActivitiObjectNotFoundException
- when one of the tasks does not exist.ActivitiException
- when an error occurs while deleting the tasks or in case one of the tasks
is part of a running process.void claim(String taskId, String userId)
setAssignee(String, String)
is that here
a check is done if the task already has a user assigned to it.
No check is done whether the user is known by the identity component.taskId
- task to claim, cannot be null.userId
- user that claims the task. When userId is null the task is unclaimed,
assigned to no one.ActivitiObjectNotFoundException
- when the task doesn't exist.ActivitiTaskAlreadyClaimedException
- when the task is already claimed by another user.void unclaim(String taskId)
claim(java.lang.String, java.lang.String)
with null user in order to unclaim the tasktaskId
- task to unclaim, cannot be null.ActivitiObjectNotFoundException
- when the task doesn't exist.void complete(String taskId)
taskId
- the id of the task to complete, cannot be null.ActivitiObjectNotFoundException
- when no task exists with the given id.ActivitiException
- when this task is DelegationState#PENDING
delegation.void delegateTask(String taskId, String userId)
DelegationState#PENDING
.
If no owner is set on the task, the owner is set to the current assignee
of the task.taskId
- The id of the task that will be delegated.userId
- The id of the user that will be set as assignee.ActivitiObjectNotFoundException
- when no task exists with the given id.void resolveTask(String taskId)
DelegationState#PENDING
delegation.
After this method returns, the delegationState
is set to DelegationState#RESOLVED
.taskId
- the id of the task to resolve, cannot be null.ActivitiObjectNotFoundException
- when no task exists with the given id.void resolveTask(String taskId, Map<String,Object> variables)
DelegationState#PENDING
delegation. After this
method returns, the delegationState
is
set to DelegationState#RESOLVED
.taskId
- variables
- ProcessEngineException
- When no task exists with the given id.void resolveTask(String taskId, Map<String,Object> variables, Map<String,Object> transientVariables)
resolveTask(String, Map)
, but allows to set transient variables too.void complete(String taskId, Map<String,Object> variables)
taskId
- the id of the task to complete, cannot be null.variables
- task parameters. May be null or empty.ActivitiObjectNotFoundException
- when no task exists with the given id.void complete(String taskId, Map<String,Object> variables, Map<String,Object> transientVariables)
complete(String, Map)
, but allows to set transient variables too.void complete(String taskId, Map<String,Object> variables, boolean localScope)
taskId
- the id of the task to complete, cannot be null.variables
- task parameters. May be null or empty.localScope
- If true, the provided variables will be stored task-local,
instead of process instance wide (which is the default for complete(String, Map)
).ActivitiObjectNotFoundException
- when no task exists with the given id.void setAssignee(String taskId, String userId)
taskId
- id of the task, cannot be null.userId
- id of the user to use as assignee.ActivitiObjectNotFoundException
- when the task or user doesn't exist.void setOwner(String taskId, String userId)
taskId
- id of the task, cannot be null.userId
- of the person that is receiving ownership.ActivitiObjectNotFoundException
- when the task or user doesn't exist.List<IdentityLink> getIdentityLinksForTask(String taskId)
IdentityLink
s associated with the given task.
Such an IdentityLink
informs how a certain identity (eg. group or user)
is associated with a certain task (eg. as candidate, assignee, etc.)void addCandidateUser(String taskId, String userId)
addUserIdentityLink(String, String, String)
; with type IdentityLinkType.CANDIDATE
taskId
- id of the task, cannot be null.userId
- id of the user to use as candidate, cannot be null.ActivitiObjectNotFoundException
- when the task or user doesn't exist.void addCandidateGroup(String taskId, String groupId)
addGroupIdentityLink(String, String, String)
; with type IdentityLinkType.CANDIDATE
taskId
- id of the task, cannot be null.groupId
- id of the group to use as candidate, cannot be null.ActivitiObjectNotFoundException
- when the task or group doesn't exist.void addUserIdentityLink(String taskId, String userId, String identityLinkType)
taskId
- id of the task, cannot be null.userId
- id of the user involve, cannot be null.identityLinkType
- type of identityLink, cannot be null (@see IdentityLinkType
).ActivitiObjectNotFoundException
- when the task or user doesn't exist.void addGroupIdentityLink(String taskId, String groupId, String identityLinkType)
taskId
- id of the task, cannot be null.groupId
- id of the group to involve, cannot be null.identityLinkType
- type of identity, cannot be null (@see IdentityLinkType
).ActivitiObjectNotFoundException
- when the task or group doesn't exist.void deleteCandidateUser(String taskId, String userId)
deleteUserIdentityLink(String, String, String)
; with type IdentityLinkType.CANDIDATE
taskId
- id of the task, cannot be null.userId
- id of the user to use as candidate, cannot be null.ActivitiObjectNotFoundException
- when the task or user doesn't exist.void deleteCandidateGroup(String taskId, String groupId)
deleteGroupIdentityLink(String, String, String)
; with type IdentityLinkType.CANDIDATE
taskId
- id of the task, cannot be null.groupId
- id of the group to use as candidate, cannot be null.ActivitiObjectNotFoundException
- when the task or group doesn't exist.void deleteUserIdentityLink(String taskId, String userId, String identityLinkType)
taskId
- id of the task, cannot be null.userId
- id of the user involve, cannot be null.identityLinkType
- type of identityLink, cannot be null (@see IdentityLinkType
).ActivitiObjectNotFoundException
- when the task or user doesn't exist.void deleteGroupIdentityLink(String taskId, String groupId, String identityLinkType)
taskId
- id of the task, cannot be null.groupId
- id of the group to involve, cannot be null.identityLinkType
- type of identity, cannot be null (@see IdentityLinkType
).ActivitiObjectNotFoundException
- when the task or group doesn't exist.void setPriority(String taskId, int priority)
taskId
- id of the task, cannot be null.priority
- the new priority for the task.ActivitiObjectNotFoundException
- when the task doesn't exist.void setDueDate(String taskId, Date dueDate)
taskId
- id of the task, cannot be null.dueDate
- the new due date for the taskActivitiException
- when the task doesn't exist.TaskQuery createTaskQuery()
TaskQuery
that can be used to dynamically query tasks.NativeTaskQuery createNativeTaskQuery()
NativeQuery
for tasks.void setVariable(String taskId, String variableName, Object value)
void setVariables(String taskId, Map<String,? extends Object> variables)
void setVariableLocal(String taskId, String variableName, Object value)
void setVariablesLocal(String taskId, Map<String,? extends Object> variables)
Object getVariable(String taskId, String variableName)
<T> T getVariable(String taskId, String variableName, Class<T> variableClass)
boolean hasVariable(String taskId, String variableName)
Object getVariableLocal(String taskId, String variableName)
<T> T getVariableLocal(String taskId, String variableName, Class<T> variableClass)
boolean hasVariableLocal(String taskId, String variableName)
Map<String,Object> getVariables(String taskId)
getVariables(String, Collection)
for better performance.Map<String,Object> getVariablesLocal(String taskId)
getVariablesLocal(String, Collection)
for better performance.Map<String,Object> getVariables(String taskId, Collection<String> variableNames)
Map<String,Object> getVariablesLocal(String taskId, Collection<String> variableNames)
List<org.activiti.engine.impl.persistence.entity.VariableInstance> getVariableInstancesLocalByTaskIds(Set<String> taskIds)
void removeVariable(String taskId, String variableName)
void removeVariableLocal(String taskId, String variableName)
void removeVariables(String taskId, Collection<String> variableNames)
void removeVariablesLocal(String taskId, Collection<String> variableNames)
Comment addComment(String taskId, String processInstanceId, String message)
Comment addComment(String taskId, String processInstanceId, String type, String message)
Comment getComment(String commentId)
void deleteComments(String taskId, String processInstanceId)
void deleteComment(String commentId)
ActivitiObjectNotFoundException
- when no comment exists with the given id.List<Comment> getTaskComments(String taskId)
List<Comment> getTaskComments(String taskId, String type)
Event getEvent(String eventId)
List<Comment> getProcessInstanceComments(String processInstanceId)
List<Comment> getProcessInstanceComments(String processInstanceId, String type)
Attachment createAttachment(String attachmentType, String taskId, String processInstanceId, String attachmentName, String attachmentDescription, InputStream content)
Attachment createAttachment(String attachmentType, String taskId, String processInstanceId, String attachmentName, String attachmentDescription, String url)
void saveAttachment(Attachment attachment)
Attachment getAttachment(String attachmentId)
InputStream getAttachmentContent(String attachmentId)
List<Attachment> getTaskAttachments(String taskId)
List<Attachment> getProcessInstanceAttachments(String processInstanceId)
void deleteAttachment(String attachmentId)
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PHY321: Classical Mechanics 1
Contents
PHY321: Classical Mechanics 1¶
Homework 3, due February 4
Date: Jan 31, 2022
Practicalities about homeworks and projects¶
You can work in groups (optimal groups are often 2-3 people) or by yourself. If you work as a group you can hand in one answer only if you wish. Remember to write your name(s)!
Homeworks are available ten days before the deadline.
How do I(we) hand in? You can hand in the paper and pencil exercises as a scanned document. For this homework this applies to exercises 1-5. Alternatively, you can hand in everything (if you are ok with typing mathematical formulae using say Latex) as a jupyter notebook at D2L. The numerical exercise(s) (exercise 6 here) should always be handed in as a jupyter notebook by the deadline at D2L.
Introduction to homework 3¶
This week’s sets of classical pen and paper and computational exercises deal with the motion of different objects under the influence of various forces. The relevant reading background is
chapter 2 of Taylor (there are many good examples there) and
chapters 5-7 of Malthe-Sørenssen.
In both textbooks there are many nice worked out examples. Malthe-Sørenssen’s text contains also several coding examples you may find useful.
There are several pedagogical aims we have in mind with these exercises:
Get practice in setting up and analyzing a physical problem, finding the forces and the relevant equations to solve;
Analyze the results and ask yourself whether they make sense or not;
Finding analytical solutions to problems if possible and compare these with numerical results. This teaches us also how to understand errors in numerical calculations;
Being able to solve (in mechanics these are the most common types of equations) numerically ordinary differential equations and compare the solutions where possible with analytical solutions;
Getting used to studying physical problems using all possible tools, from paper and pencil to numerical solutions;
Then analyze the results and ask yourself whether they make sense or not.
The above steps outline important elements of our understanding of the scientific method. Furthermore, there are also explicit coding skills we aim at such as setting up arrays, solving differential equations numerically and plotting your results. Coding practice is also an important aspect. The more we practice the better we get (hopefully). From a numerical mathematics point of view, we will solve the differential equations using Euler’s method (forward Euler).
The code we will develop can be reused as a basis for coming homeworks. We can also extend the numerical solver we write here to include other methods (later) like the modified Euler method (Euler-Cromer, midpoint Euler) and more advanced methods like the family of Runge-Kutta methods and the Velocity-Verlet method.
At the end of this course, we will thus have developed a larger code (or set of codes) which will allow us to study different numerical methods (integration and differential equations) as well as being able to study different physical systems. Combined with analytical skills, the hope is that this can allow us to explore interesting and realistic physics problems. By doing so, the hope is that can lead to deeper insights about the laws of motion which govern a system.
And hopefully you can reuse many of the above solvers in other courses (our ideal).
Exercise 1 (20 pt), Electron moving into an electric field¶
An electron is sent through a varying electrical field. Initially, the electron is moving in the \(x\)-direction with a velocity \(v_x = 100\) m/s. The electron enters the field when it passes the origin. The field varies with time, causing an acceleration of the electron that varies in time
1a (4pt) Find the velocity as a function of time for the electron.
1b (4pt) Find the position as a function of time for the electron.
The field is only acting inside a box of length \(L = 2m\).
1c (4pt) How long time is the electron inside the field?
1d (4pt) What is the displacement in the \(y\)-direction when the electron leaves the box. (We call this the deflection of the electron).
1e (4pt) Find the angle the velocity vector forms with the horizontal axis as the electron leaves the box.
Exercise 2 (10 pt), Drag force¶
Taylor exercise 2.3
Exercise 3 (10 pt), Falling object¶
Taylor exercise 2.6
Exercise 4 (10 pt), and then a cyclist¶
Taylor exercise 2.26
Exercise 5 (10 pt), back to a falling ball and preparing for the numerical exercise¶
Useful material: Malthe-Sørenssen chapter 7.5 and Taylor chapter 2.4.
In this example we study the motion of an object subject to a constant force, a velocity dependent force. We will reuse the code we develop here in homework 4 for a position-dependent force.
Here we limit ourselves to a ball that is thrown from a height \(h\) above the ground with an initial velocity \(\boldsymbol{v}_0\) at time \(t=t_0\). We assume the air resistance is proportional to the square velocity, Together with the gravitational force these are the forces acting on our system. Note that due to the specific velocity dependence, we cannot find an analytical solution for motion in the \(x\) and \(y\) directions, see the discussion in Taylor after eq. (2.61). In order to find an analytical solution we need to assume that the object is falling in the \(y\)-direction (negative direction) only.
The position of the ball as function of time is \(\boldsymbol{r}(t)\) where \(t\) is time. The position is measured with respect to a coordinate system with origin at the floor.
We assume we have an initial position \(\boldsymbol{r}(t_0)=h\boldsymbol{e}_y\) and an initial velocity \(\boldsymbol{v}_0=v_{x,0}\boldsymbol{e}_x+v_{y,0}\boldsymbol{e}_y\).
In this exercise we assume the system is influenced by the gravitational force
and an air resistance given by a square law
The analytical expressions for velocity and position as functions of time will be used to compare with the numerical results in exercise 6.
5a (3pt) Identify the forces acting on the ball and set up a diagram with the forces acting on the ball. Find the acceleration of the falling ball.
5b (4pt) Assume now that the object is falling only in the \(y\)-direction (negative direction). Integrate the acceleration from an initial time \(t_0\) to a final time \(t\) and find the velocity. In Taylor equations (2.52) to (2.58) you will find a very good discussion of this.
5c (4pt) Find thereafter the position as function of time starting with an initial time \(t_0\). Find the time it takes to hit the floor. Here you will find it convenient to set the initial velocity in the \(y\)-direction to zero. Taylor equations (2.52)-(2.58) should contain all relevant information for solving this part as well.
We will use the above analytical results in our numerical calculations in exercise 6. The analytical solution in the \(y\)-direction only will serve as a test for our numerical solution.
Exercise 6 (40pt), Numerical elements, solving exercise 5 numerically¶
This exercise should be handed in as a jupyter-notebook at D2L. Remember to write your name(s).
Last week we:
Gained more practice with plotting in Python
Became familiar with arrays and representing vectors with such objects
This week we will:
Learn and utilize Euler’s Method to find the position and the velocity
Compare analytical and computational solutions
Add additional forces to our model
%matplotlib inline
# let's start by importing useful packages we are familiar with
import numpy as np
import matplotlib.pyplot as plt
%matplotlib inline
We will choose the following values
mass \(m=0.2\) kg
accelleration (gravity) \(g=9.81\) m/s\(^{2}\).
initial position is the height \(h=2\) m
initial velocities \(v_{x,0}=v_{y,0}=10\) m/s
Can you find a reasonable value for the drag coefficient \(D\)? You need also to define an initial time and the step size \(\Delta t\). We can define the step size \(\Delta t\) as the difference between any two neighboring values in time (time steps) that we analyze within some range. It can be determined by dividing the interval we are analyzing, which in our case is time \(t_{\mathrm{final}}-t_0\), by the number of steps we are taking \((N)\). This gives us a step size \(\Delta t = \dfrac{t_{\mathrm{final}}-t_0}{N}\).
With these preliminaries we are now ready to plot our results from exercise 5.
6a (10pt) Set up arrays for time, velocity, acceleration and positions for the results from exercise 5. Define an initial and final time. Choose the final time to be the time when the ball hits the ground for the first time. Make a plot of the position and velocity as functions of time. Here you could set the initial velocity in the \(y\)-direction to zero and use the result from exercise 5. Else you need to try different initial times using the result from exercise 5 as a starting guess. It is not critical if you don’t reach the ground when the initial velocity in the \(y\)-direction is not zero.
We move now to the numerical solution of the differential equations as discussed in the lecture notes or Malthe-Sørenssen chapter 7.5. Let us remind ourselves about Euler’s Method.
Suppose we know \(f(t)\) and its derivative \(f'(t)\). To find \(f(t+\Delta t)\) at the next step, \(t+\Delta t\), we can consider the Taylor expansion:
\(f(t+\Delta t) = f(t) + \dfrac{(\Delta t)f'(t)}{1!} + \dfrac{(\Delta t)^2f''(t)}{2!} + ...\)
If we ignore the \(f''\) term and higher derivatives, we obtain
\(f(t+\Delta t) \approx f(t) + (\Delta t)f'(t)\).
This approximation is the basis of Euler’s method, and the Taylor expansion suggests that it will have errors of \(O(\Delta t^2)\). Thus, one would expect it to work better, the smaller the step size \(h\) that you use. In our case the step size is \(\Delta t\).
In setting up our code we need to
Define and obtain all initial values, constants, and time to be analyzed with step sizes as done above (you can use the same values)
Calculate the velocity using \(v_{i+1} = v_{i} + (\Delta t)*a_{i}\)
Calculate the position using \(pos_{i+1} = r_{i} + (\Delta t)*v_{i}\)
Calculate the new acceleration \(a_{i+1}\).
Repeat steps 2-4 for all time steps within a loop.
6b (20 pt) Write a code which implements Euler’s method and compute numerically and plot the position and velocity as functions of time for various values of \(\Delta t\). Comment your results.
6c (10pt) Compare your numerically obtained positions and velocities with the analytical results from exercise 5. In order to do this, you need to take out the motion in the \(x\)-direction. Comment again your results.
Classical Mechanics Extra Credit Assignment: Scientific Writing and attending Talks¶
The following gives you an opportunity to earn five extra credit points on each of the remaining homeworks and ten extra credit points on the midterms and finals. This assignment also covers an aspect of the scientific process that is not taught in most undergraduate programs: scientific writing. Writing scientific reports is how scientist communicate their results to the rest of the field. Knowing how to assemble a well written scientific report will greatly benefit you in you upper level classes, in graduate school, and in the work place.
The full information on extra credits is found at https://github.com/mhjensen/Physics321/blob/master/doc/Homeworks/ExtraCredits/. There you will also find examples on how to write a scientific article. Below you can also find a description on how to gain extra credits by attending scientific talks.
This assignment allows you to gain extra credit points by practicing your scientific writing. For each of the remaining homeworks you can submit the specified section of a scientific report (written about the numerical aspect of the homework) for five extra credit points on the assignment. For the two midterms and the final, submitting a full scientific report covering the numerical analysis problem will be worth ten extra points. For credit the grader must be able to tell that you put effort into the assignment (i.e. well written, well formatted, etc.). If you are unfamiliar with writing scientific reports, see the information here
The following table explains what aspect of a scientific report is due with which homework. You can submit the assignment in any format you like, in the same document as your homework, or in a different one. Remember to cite any external references you use and include a reference list. There are no length requirements, but make sure what you turn in is complete and through. If you have any questions, please contact Julie Butler at<EMAIL_ADDRESS>| HW/Project | Due Date | Extra Credit Assignment |
|---|---|---|
| HW 3 | 2-4 | Abstract |
| HW 4 | 2-11 | Introduction |
| HW 5 | 2-18 | Methods |
| HW 6 | 3-18 | Results and Discussion |
| **Midterm 1** | **3-4** | *Full Written Report* |
| HW 7 | 3-25 | Abstract |
| HW 8 | 4-15 | Introduction |
| HW 9 | 4-22 | Results and Discussion |
| **Midterm 2 | ** _4-8_ | *Full Written Report* |
| HW 10 | 4-29 | Abstract |
| **Final** | **5-6** | *Full Written Report* |
You can also gain extra credits if you attend scientific talks. This is described here.
Integrating Classwork With Research¶
This opportunity will allow you to earn up to 5 extra credit points on a Homework per week. These points can push you above 100% or help make up for missed exercises. In order to earn all points you must:
Attend an MSU research talk (recommended research oriented Clubs is provided below)
Summarize the talk using at least 150 words
Turn in the summary along with your Homework.
Approved talks: Talks given by researchers through the following clubs:
Research and Idea Sharing Enterprise (RAISE): Meets Wednesday Nights Society for Physics Students (SPS): Meets Monday Nights
Astronomy Club: Meets Monday Nights
Facility For Rare Isotope Beam (FRIB) Seminars: Occur multiple times a week
If you have any questions please consult Julie or Morten
All the material on extra credits is at https://github.com/mhjensen/Physics321/blob/master/doc/Homeworks/ExtraCredits/.


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Easily create interactive charts by leveraging the 'Echarts Javascript' library which includes 34 chart types, themes, 'Shiny' proxies and animations.
| Version: | 0.2.0 |
| Imports: | htmlwidgets, magrittr, dplyr, purrr, countrycode, d3r, broom, shiny, scales |
| Suggests: | data.tree, jsonlite, knitr, rmarkdown, quantmod, png, tibble, htmltools, tidyr |
| Published: | 2018-11-14 |
| Author: | John Coene [aut, cre] |
| Maintainer: | John Coene <jcoenep at gmail.com> |
| BugReports: | https://github.com/JohnCoene/echarts4r/issues |
| License: | Apache License (≥ 2.0) |
| URL: | http://echarts4r.john-coene.com/ |
| NeedsCompilation: | no |
| Materials: | README NEWS |
| CRAN checks: | echarts4r results |
| Reference manual: | echarts4r.pdf |
| Package source: | echarts4r_0.2.0.tar.gz |
| Windows binaries: | r-devel: echarts4r_0.2.0.zip, r-release: echarts4r_0.2.0.zip, r-oldrel: echarts4r_0.2.0.zip |
| OS X binaries: | r-release: echarts4r_0.2.0.tgz, r-oldrel: echarts4r_0.2.0.tgz |
| Old sources: | echarts4r archive |
Please use the canonical form https://CRAN.R-project.org/package=echarts4r to link to this page.


HTML Lab-4
Type a Number to the Iteration:
Type a Number for Pixel growth:
Type Number for Iteration and One for Pixel Growth and ClickMe!