Hot girl with cool car
问题描述 :
Unlike other girls, Huahua have a special hobby, that she is a professional fan of automobile race game. Her interest ranging widely from real car racing such as Formula 1, Dakar Rally, Le Mans World Endurance Championship, even to virtual games ,for instance, Need for Speed. Just because of this, Huahua is extremely popular in boys’ eyes. It is a universally truth that hot girl with powerful cool car, everybody becomes blood surge!
Now Huahua got an idea. You know in professional racing game, choose a most suitable path when steer is very important. It can even decide the result. Driver must know very well about the road condition, control car speed at the braking point before entering curve, and turn wheel immediately at the beginning of the curve. But when is the right time to turn? Which is the best path? Huahua rise this technical problem to you.
Suppose there is a racing track shown in Graph 1, and we are facing a regular curve. Huahua will tell you the road condition: w (Unit: Meter) stands for the track wide, r (Unit: Meter) for the turning radius (inside the track), and θ ( 0°< θ <=180°) for the the angle of the curve we discussing. Since larger turning radius can provide driver better control experience and gain more time, your task is to tell Huahua the largest turning radius driver can pick. The one who first slove this problem will become the lucky dog and able to dating with Huahua on Saint Valentine’s Day!
输入:
For each case:
Three postive real number: r, w, θ, as described above.
输出:
For each case:
Three postive real number: r, w, θ, as described above.
样例输入:
30 70 90
样例输出:
268.995
#include<iostream> #include<cstdio> #include<cstring> #include<string> #include<algorithm> #include<sstream> #include<map> #include<set> #include<cmath> #include<iomanip> #include<cstdlib> #include<cctype> #include<assert.h> #include<stack> #include<queue> #include<vector> #include<list> using namespace std; double pi=acos(-1); double w,r,sita; int main() { while(~scanf("%lf%lf%lf",&r,&w,&sita)) { sita/=180.; sita*=pi; double umc=cos(sita/2.)-1.; r-=w/umc; printf("%.3f\n",r); } return 0; }
只有我觉得这图有点怪么，像是成年人被压扁了
只有我觉得这图有点怪么，像是成年人被压扁了
只有我觉得这图有点怪么，像是成年人被压扁了
只有我觉得这图有点怪么，像是成年人被压扁了
只有我觉得这图有点怪么，像是成年人被压扁了
只有我觉得这图有点怪么，像是成年人被压扁了
只有我觉得这图有点怪么，像是成年人被压扁了
只有我觉得这图有点怪么，像是成年人被压扁了
有些说不通吧，只有1个孩子肯定是男孩了
有点意思
int half(int *array,int len,int key)
{
int l=0,r=len;
while(l<r)
{
int m=(l+r)>>1;
if(key>array )l=m+1;
else if(key<array )r=m;
else return m;
}
return -1;
}
这种就能避免一些Bug
l,m,r
左边是l,m;右边就是m+1,r;
对于输出格式不用控制？？还是直接使用cout输出。？？
真考人啊
因为要修改链表头(指针)，所以要用指针的指针
这道题目的核心一句话是：取还是不取。
如果当前取，则index+1作为参数。如果当前不取，则任用index作为参数。
必须试过啊
很好。代码比书上的简练！
2的64次方是多少？ 这到底是在考什么啊
书上的解法更巧妙一些，在九度OJ实测的效率差不多
这配图…..
这是研发类的题还是算法类？
思路二可以用一个长度为k的队列来实现，入队后判断下队尾元素的next指针是否为空，若为空，则出队指针即为所求。


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We are a student organization at the University of Chicago Harris School for Public Policy created to foster data skills and analytical expertise among public policy students.
Looking to gain more data skills? Want to share the skills you already have? Fill out a quick survey telling us what you'd like to learn, and whether you can help. We're hoping to put on several data training sessions this year based on your input.
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Bad practice
Heading goes here
Strong is already implied because the heading tag has semantic meaning.
Strong inside a heading tag may cause a red flag with major search engines.
Good practice
Heading goes here
Or if you want the heading to be bold for example
Heading goes here
We essentially have a typography partial (SASS) which includes a whole list of formatting properties
Bad practice
Find land
Parcel ID:
Parcel size:
Element <div> not allowed as child of element <h3> in this context
Element <dt> not allowed as child of element <h3> in this context
Good practice
Find land
- Parcel ID:
- Parcel Size:
Or you could even use a description list…
Find land
- Parcel ID:
- Value
- Parcel Size:
- Value
Description list was previously known as a Definition list in HTML4
Bad practice
1. Who do you want to give permissions to?
I had to comment out the <p> tags because the syntax highlighter corrected the mistake automatically.
Correct practice
1. Who do you want to give permissions to?
A heading tag should most likely be used here.
Bad practice
You have merged parcels which are:
- Some text was here and some more text
I had to comment out the <p> tags because the syntax highlighter corrected the mistake automatically.
Strong is incorrectly used here. If you want bold text use the <b> tag for presentation.
Screen readers render the <strong> tag with a 'LOUDER VOICE' - (200 instances).
This is not valid, and should not be formatted in this way.
Good practice
You have merged parcels which are:
- Item 1
- Item 2
- Item 3
If the results will never be >1, then a UL or OL should not really be used.
Bad practice
{{errorMessage}}
Example, customer reference '1234567890'
I had to comment out the <p> tags because the syntax highlighter corrected the mistake automatically.
Nesting P tags inside of other P tags is invalid HTML.
Poor HTML / No meaningful structure
Bad practice
We suggest these permission levels for
These are the permission levels for
{{assignedPerson.firstName}} {{assignedPerson.lastName}},
{{role.name}} for {{organisation.name}}.
Strong is incorrectly used here.
Inline styles have the highest precedence, which will cause issues long term
Bad practice
I had to comment out the <div> tag because the syntax highlighter corrected the mistake automatically.
Inline styles have the highest precedence, which will cause issues long term
This is not how you close a div tag
Bad practice
I had to comment out the <form> tags because the syntax highlighter corrected the mistake automatically.
Nested forms are not allowed.
Check your HTML fully to avoid errors like these.
Bad practice
A <legend> tag defines a caption for the <fieldset>.
Use <fieldset> and <legend> to group logically related form controls.
Good practice
Clean. Accessible and Semantic HTML
Associates a label to a form control. Good for accessibility.Bad practice
I had to comment out the <input> tag because the syntax highlighter corrected the mistake automatically.
An input is self-closing you can't wrap a closing input tag on it
This would fail validation and cause accessibility problems.
Good practice
Wrapping a <label> around an <input> is perfectly valid and has certain advantages.
Bad practice
I had to comment out the <textarea> tag because the syntax highlighter corrected the mistake automatically.
Textareas work differently to standard inputs. You don't close them like this!
We also have a duplication of name attribute
Good practice
The <label> is associated with the form control
A few other important pointers…
http://line25.com/articles/youre-doing-it-wrong-common-html-tag-misuse
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MdMenuModule
This directive is intended to be used in conjunction with an md-menu tag. It is responsible for toggling the display of the provided menu instance.
| Name | Description |
|---|---|
@Input('mdMenuTriggerFor')
menu
|
References the menu instance that the trigger is associated with. |
@Output() onMenuOpen
|
Event emitted when the associated menu is opened. |
@Output() onMenuClose
|
Event emitted when the associated menu is closed. |
menuOpen
|
Whether the menu is open. |
dir
|
The text direction of the containing app. |
| toggleMenu | |
|---|---|
| Toggles the menu between the open and closed states. |
| openMenu | |
|---|---|
| Opens the menu. |
| closeMenu | |
|---|---|
| Closes the menu. |
| destroyMenu | |
|---|---|
| Removes the menu from the DOM. |
| focus | |
|---|---|
| Focuses the menu trigger. |
| Name | Description |
|---|---|
positionX
|
Position of the menu in the X axis. |
positionY
|
Position of the menu in the Y axis. |
templateRef
|
|
items
|
|
@Input('class')
classList
|
This method takes classes set on the host md-menu element and applies them on the menu template that displays in the overlay container. Otherwise, it's difficult to style the containing menu from outside the component. |
@Output() close
|
Event emitted when the menu is closed. |
| focusFirstItem | |
|---|---|
| Focus the first item in the menu. This method is used by the menu trigger to focus the first item when the menu is opened by the ENTER key. |
| setPositionClasses | |
|---|---|
| It's necessary to set position-based classes to ensure the menu panel animation folds out from the correct direction. | |
| Parameters | |
|
posX MenuPositionX
|
|
|
posY MenuPositionY
|
This directive is intended to be used inside an md-menu tag. It exists mostly to set the role attribute.
| Name | Description |
|---|---|
@Input() disabled
|
Whether the menu item is disabled. |
isAriaDisabled
|
Sets the aria-disabled property on the menu item. |
| focus | |
|---|---|


In this section, we wil use the processed data from tweets to analysis
| Hashtags | |
| Melbourne | 9Married, democratically, envious, envy, GMS, GMSequation, jealous, peace |
| Sydney | 9Married, jealous, JustDessertsAU, MarriedAtFirstSight, VMAs, VoteDNCE |
| Newcastle | FoxSportsLive, NUFC, Pokemon3, selfie |
| Brisbane | qanda, StevenUniverse, TheresOnlyOne |
| Education Level | Correlations (%) |
| Persons with Postgraduate degree | 0.61 |
| Persons With Post School Qualification | 0.57 |
| Completed Year 12 or equivalent | 0.52 |
| Completed Year 9 or equivalent | -0.31 |
| Did not go to school | -0.05 |
| Employment Type | Correlations (%) |
| Clerical, Administrative Workers | -0.42 |
| Community, Personal Service Workers | -0.37 |
| Labourers | -0.62 |
| Machinery Operators, Drivers | -0.59 |
| Managers | 0.35 |
| Professionals | 0.7 |
| Sales Workers | -0.63 |
| Technicians and Trades Workers | -0.62 |
| Unemployment rate | 0.38 |
| Income | Correlations (%) |
| Median Total income | 0.29 |
| Median equivalised total household income (weekly) | 0.39 |
| Total income earners - median age | -0.61 |
| Gini coefficient | 0.61 |
| Correlations (%) | |
| Born in Americas | 0.5 |
| Born in Asia | 0.57 |
| Born in Europe | 0.08 |
| Born in North Africa, Middle East | 0.5 |
| Born in Oceania, Antarctica (exc. Australia) | -0.15 |
| Total Born Overseas | 0.5 |


These are alerts generated by Sweet Security
| Source | Message | Device | Date | Addressed On |
|---|---|---|---|---|
| {{alert['_source']['source']|safe}} | {{alert['_source']['message']|safe}} | {{alert['_source']['mac']|safe}} | {{alert['_source']['firstSeen']|safe}} | {{alert['_source']['addressedDate']|safe}} |


** out of ****
Year: 2000. Starring the voices of Matt Damon, Drew Barrymore, Bill Pullman, Nathan Lane, Janeane Garofalo, John Leguizamo, Tone Loc, Jim Breuer, Alex D. Linz, Ron Perlman. Story by Hans Bauer and Randall McCormick. Screenplay by Ben Edlund, John August, and Joss Whedon. Directed by Don Bluth and Gary Goldman. Rated PG.
"Titan A.E." is a frustrating movie. You watch it, and you get the idea that it's trying really, really hard to be a great film, a modern classic. But then you come up with an unshakable feeling that the movie just isn't working, and no matter how many stops it pulls out, you just can't shake that feeling. That's what happened to me while watching "Titan A.E." It's an ambitious film, but it's nowhere close to greatness. And the more I think about it, the more its failures stand out.
The film takes place roughly a thousand years in the future, where an evil race made of pure energy called the Drej has destroyed Earth. Humans now exist as an "orphan" species, drifting from outpost to outpost without finding any real home. Cale (voice of Alex D. Linz) was a young boy when Earth was destroyed, and his father was one of the principal officials in charge of evacuating the planet. But Cale's father disappeared after Earth's destruction, never to be heard from again. Now a cynical survivor (and now voiced by Matt Damon), Cale stumbles upon a ship with a partially human crew at a space dock. He's startled to find that the captain of the ship, gruff Commander Korso (Bill Pullman), has actually been looking for him. Korso, a friend of Cale's father, reveals that Cale actually holds the key to the humans' last hope at finding a new home: His father left him a genetically-encoded map pinpointing the whereabouts of the Titan, a planet-sized space station hidden somewhere in outer space. Unfortunately, the Drej are interested in finding the Titan as well, and they are hunting Cale down in order to pry the information from him. Not allowed much of a choice after the Drej attack his current residence, Cale agrees to go with Korso.
The story sounds fine, like a pretty good opportunity for an exciting space adventure. It's derivative, sure, but most movies of this kind are, and "Titan A.E." can hardly be faulted for cribbing ideas when the films it's cribbing from ("Star Wars," "Star Trek") would have to plead guilty to the same charge. But that doesn't let it off the hook for getting its premise all wrong.  "Titan A.E." presents no such depth, because the writers haven't paid much attention to the details of their own plot. For example, it's established that the Drej want to destroy the human race, but we never find out why they want to do that. What threat do the humans pose to them? Who knows? Supporting characters are introduced without any reason given for them to be there. How did Commander Korso put together such a diverse crew? Who knows? Korso remarks that he's been looking for Cale "for many years," so he can find the Titan, for which he's also been searching "for many years." A single person is easier to find in the vast expanse of space than a planet-sized spaceship? Why not just look for the Titan itself? Who knows?
The script fails at proper characterization, too. The heroes in a space opera don't have to be deep, but they should at least be likeable. "Titan A.E." fails on both counts. The apparent good guys are only good in the sense that they don't wish anyone else any specific harm. Cale may be blond and fresh-faced, but he's so bland, and so self-pitying, it's hard to really root for him. Japanese space-punk Akima (Drew Barrymore) serves as Cale's love interest, and she's not very interesting either. Nor is her character consistent: Sometimes she's tough, sometimes she's helpless, depending on what the rote story demands. Korso comes off as equally subject to the whims of the script. His motivations change back and forth without much conviction; by the end, you're wondering if this guy believes in anything at all. It doesn't help that the big-name cast turns in mostly uninspiring voice performances. Damon, Barrymore, Pullman, and Janeane Garofalo sound bored. Nathan Lane and John Leguizamo (as the ostensibly "colorful" sidekicks) are at least enthusiastic, but still unfocused. Most of the actors' dialogue is horribly concocted: The "funny" lines induce cringing, the serious ones occasional giggling.
"Titan A.E." does contain some breathtaking imagery. Visuals, not surprisingly, are the film's saving grace. Two action set-pieces, one during the Earth's destruction and another in a field of ice crystals, are about as exciting as anything you're going to see this year. But they're oases in a desert, because "Titan A.E." doesn't make these or any other scenes feel necessary.  It doesn't move.
What "Titan A.E." forgets about making a fun space adventure is that the adventure is supposed to be *fun*. Almost every plot point is treated with such grim portentousness that any and all vitality is sucked right out of the production. Obviously, a film of this nature can't goof its way through the story, and some things need to be treated seriously (like the Force, for example). But there also needs to be a sense of giddy enthusiasm, an indication that the filmmakers were having as much fun making their movie as they expect the audience to have watching it. This film gives no such indication.  This is not the stuff of a modern classic.
-reviewed by Shay Casey
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| M2dude 12th Sep 2010, 12:05 permalink Post: 329 |
Hi Steve, good question. You could not prime Alt ACQ directly from MAX CLIMB/MAX CRUISE, but I'm sure the guys would confirm that FL600 was nonetheless set in the AFCS altitude window. If you did come close to FL600, then you would get an altitude alert audio and visual warning anyway, but the crew would obviously know anyway. The guys will have to confirm this but I think that ALT HOLD would be selected at this point, and the autopilot would now constrain the altitude by varying pitch attitude. You would normally be flying in nice cold conditions for this to occur, hardly ever on the North Atlantic, but on the LHR-BGI sector it would occur as often as not. (As usual, apologies to my all flying pals if I'm talking rubbish again
).
Dude |
||
| spfoster 12th Sep 2010, 15:39 permalink Post: 330 |
Hi Dude,
Thanks for the reply, I never knew you couldn't prime ALT ACQ from MAX CLIMB / MAX CRUISE. I was thinking though that if you had ALT HOLD selected then the autopilot wouldn't be able to vary the pitch attitude and it would hold at the ALT HOLD level. Once there it wouldn't be able to use pitch to increase or decrease speed if necessary. I can see how the autothrottles could hold the speed back but if it were to get warmer then even at full power it may not be able to maintain speed at a fixed altitude. I'm sure there is a simple answer which will leave us saying "oh yeah, how obvious, didn't think of that" Just strange it doesn't seem to be written anywhere. Thanks, Steve. |
||
| M2dude 13th Sep 2010, 01:18 permalink Post: 336 |
spfoster
Quote:
Dude |
||
| Bellerophon 3rd Dec 2010, 13:37 permalink Post: 829 |
M2Dude
Quote:
Deciding that they would like to maintain this groundspeed, they went ALT HOLD and MACH HOLD at around FL530. They maintained their groundspeed, so the story goes, but the autothrottle then progressively reduced the N1, as the aircraft weight reduced, over the next couple of hours, into the prohibited range! Did you ever hear of any such event? Best Regards Bellerophon |
||
| M2dude 4th Dec 2010, 09:17 permalink Post: 832 |
Bellerophon
Quote:
ChristiaanJ
Quote:
The lighting of a reheat flame can be achieved in three ways: 1) By using an electric arc ignitor.. the least reliable system, although relatively simple in concept. 2) Catalytic ignition, where the reheat fuel is sprayed over a platinum based catalyst, spontaneously igniting. I recall that although generally reliable, eventually the catalyst compound erodes away and you are left with no ignition source. 3) Hot streak injection (or ignition). I this case a sizable jet of fuel is injected through a single injector placed the the combustion chamber of the engine, a powerful streak of flame then 'shoots out' of the turbine, and ignites the reheat fuel. Generally reliable as long as the injector itself does not carbon up (as our new friend Howiehowie93 pointed out). What amazed me with this system when we were looking at it for Concorde, was that the Olympus 593 designer I spoke to at Rolls-Royce told me that it has a negligible effect on turbine blade life, as the hottest part of the flame does not hit the blades themselves, and also of course it is a very short duration burn anyway (1 - 2 seconds). And Christian my friend, you should indeed 'rabbit on' here about some of your observations regarding Concorde electronics technology, you have a unique insight here as (probably) the only Concorde systems designer that regularly visits 'here'. I'm sure I speak for many of us here when I say that your experiences are unique and your contributaions are always illuminating. Come on, let's have some Volts/Amps and Ohms Best Regards Dude |
||
| Bellerophon 22nd Feb 2014, 03:16 permalink Post: 1789 |
ruddman
...Being that the Concorde looks like a slippery sob, how were the descents planned?... The distance required to decel/descend from M2.0 in cruise/climb down to 3,000 at 250 kts was obtained from a checklist chart. Entering with the (expected) FL at Top of Descent and then correcting for the average wind component expected in the descent and also for the temperature deviation from ISA gave the required track miles. It wasn\x92t used a lot, because generally the more critical descent requirement was to decelerate so as to be (just) below M1.0 at a specified point on the arrival route, for noise reasons, to avoid booming land. There was a second chart, utilised in the same way as the first, which provided this information. Sometimes this distance might need to be increased a little, as, if a subsonic cruise was expected before continuing the approach, the engines were \x93warmed\x94 up at M0.97 and after passing FL410, by the application of power, for one minute, by the Flight Engineer. ...Did you just pull the throttles back to flight idle?... Only if you were willing to run the risk four pop surges from the engines and the near certainty of a clip round the ear from your Flight Engineer. Usually the pilots handled the throttles from \x93Power Up to Gear Up\x94 and from \x93Gear Down to Shut Down\x94. The Flight Engineer generally did all the rest, which, thankfully, left all the tricky drills and procedures as his responsibility. ...Or was there a little more engine management and more gradual handling of the engines and descent?... On a normal decel/descent, the handling pilot would select ALT HOLD and then ask the Flight Engineer to reduce power to 18\xba TLA (Throttle Lever Angle). The speed would decay to 350 kts IAS (Indicated Air Speed) IAS HOLD was engaged and the descent flown at 350 kts IAS. The next power reduction (32\xba TLA) came when, still flying at 350 kts IAS, the Mach number reduced through M1.50. ...And I'm guessing the approach speeds were fairly high so hitting the touchdown zone was pretty important?... In terms of not running off the end of the runway, touching down in the correct spot was as important on Concorde as on other aircraft types. However, due to the geometry of Concorde on landing, the tail, engine pods and reverser buckets were already fairly close to the runway. Add in a \x93firm\x94 touchdown, or if the wings are not completely level, and ground clearance becomes marginal, so a prolonged flare and floated landing, with an increasing aircraft attitude, was not acceptable. The risk of a pod, tail or a reverser bucket scrape on Concorde was greater than on most conventional jet aircraft. ... So if things got out of shape a little, and a G/A was required, how do you handle what looks like 4 rockets on the wings and applying the right amount of power?...
|
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Oruko Pius
Senior Computer Science + Software Developer
Oruko is a goal oriented and force driven individual who is currently pursuing a Computer Science degree in his senior year. His main stack is Python, Django, Flask, PostgreSQL and React.js. My interest in Software Engineering, web development track started way back in 2019 where I attended a bootcamp and get introduced into array of cool stuff. I have not backed down since then purposing on trying out new challenging projects in sharpening my skills in readyong for the job market.
Technology is the next big thing in driving the civilization to a better future in promoting sustainablble energy, reducing hunger through use of advanced AI systems, mass internet access via deploying internet into space among many things that will change the picture of humanity once and for all. I would love to be part of this change.
Featured Projects
View selected projects below. More information can be found at orukopius.com.
Instabook
Lorem ipsum, or lipsum as it is sometimes known, is dummy text used in laying out print, graphic or web designs. The passage is attributed to an unknown typesetter in the 15th century who is thought to have scrambled parts of Cicero's De Finibus Bonorum et Malorum for use in a type specimen book. It usually begins with:
View project / case studyInstagramClone
Lorem ipsum, or lipsum as it is sometimes known, is dummy text used in laying out print, graphic or web designs. The passage is attributed to an unknown typesetter in the 15th century who is thought to have scrambled parts of Cicero's De Finibus Bonorum et Malorum for use in a type specimen book. It usually begins with:
View project / case studyWork Experience
Optional paragraph for work experience summary. Not a part of the job details. Delete if not being used.
Engineering Education Contributor
Section.io
Jan 2021-Present
Contributing to articles around but not limited to technology, cloud services, engineering to help the growing tech community.
Software Engineering Intern
Talinda East Africa
July 2019-August 2019
I was in charge of redesigning the companies website in ensuring maximum leads through simplfying the web basics.
Key Contributions:
- Designing B2B ecommerce shop using Shopify API.
- Styling the site using Sass an advance CSS3
- Web process mapping,graphic and SEO basics
- Payment Gateaway integrations using Mpesa API and Flutterwave by Rave
- Increased the number of leads by 4.7% due to easy surfing by customers in the website reducing incomplete search and site abandoning.
Software Engineering Intern
Rabbii Technology Solutions Limited
June 2019-July 2019
Working closely with the CTO in creating the backend API for an online education system using python3 flask.
Key Contributions:
- Created the system wireframes using Figma
- databases scripts using PostgreSQL
- Executing any delegated tasks.
Education
Kenyatta University - Nairobi City
Bsc Computer Science, 2021
Summary or accomplishments.
Moringa School - Nairobi City
Diploma Software Development, 2019
I attended this 6 months bootcamp and learnt the basics of HTML5, JavaScript, Python and its framework.


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carousel: {{theme_settings.homepage_show_carousel}}
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recent_posts:
limit: {{theme_settings.homepage_blog_posts_count}}
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{{{region name="home_below_carousel"}}}
{{/partial}}
{{#partial "scripts"}}
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{{#partial "page"}}
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{{> components/common/alert-info message}}
{{/each}}
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{{> os/pages/home/featured-products }}
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{{{region name="home_below_featured_products"}}}
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{{> os/pages/home/dividers/bubbly-bottom }}
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Please input students name with their grade separated by comma and space Example: Georgi Petrov 3, Ivan Ivanov 4...


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SM@RT is a great software engineering team of the Reliability of Systems and Software department that specializes in software agility and safety for cyber-physical systems. The team explores new foundations, and develops ground-breaking tools and methods for modeling and software languages (domain-specific languages, specification languages, programming and modeling languages), with a particular focus on the scientific breakthroughs related to socio-technical coordination (heterogeneity of models and execution platforms, final user in the loop, etc.). SM@RT is a leading team in model-driven engineering (MDE) and software language engineering (SLE). The team is highly involved in the international scientific community, and has established strong industrial partnerships (through bilateral and collaborative projects). SM@RT seconds most of the scientific contributions with software developments. The team is also highly involved in various open-source communities (e.g., Eclipse), and contributes to different projects.
An integrated model-based early validation approach for Railway Systems
GEMOC is an open and international initiative that aims to coordinate and disseminate the research results regarding the support of the coordinated use of various modeling languages that will lead to the concept of the globalization of modeling languages.
MOdels and Information Sharing for System Engineering in Extended Entreprise
Ph.D. & M.Sc.


WebViewVC
class WebViewVC : UIViewController
The purpose of the WebViewVC
view controller is to allow user to authenticate via Instagram and provide access of their personal details.
There’s a matching scene in the Authenticate.storyboard file. Go to Interface Builder for details.
The WebViewVC
class is a subclass of the UIViewController
, and it conforms to the WKNavigationDelegate
protocol.
-
Undocumented
Declaration
Swift
@IBOutlet weak var labelTitle: UILabel!
-
Undocumented
Declaration
Swift
@IBOutlet weak var webViewLogin: WKWebView!
-
Undocumented
Declaration
Swift
typealias SuccessHandler = (_ accesToken: String) -> Void
-
Undocumented
Declaration
Swift
var urlRequest: URLRequest?
-
Undocumented
Declaration
Swift
override func viewDidLoad()
-
Undocumented
Declaration
Swift
override func viewWillAppear(_ animated: Bool)
-
Undocumented
Declaration
Swift
override func didReceiveMemoryWarning()
-
This click_Back will be called when user clicks on back button. It will redirect user to previous screen
Declaration
Swift
@IBAction func click_Back(_ sender: Any)
Parameters
sender
a reference to the button that has been touched
Return Value
nil
-
setUpView function is used to setup default values, messages and UI related changes for the current class.
Declaration
Swift
func setUpView()
Return Value
nil
-
unSignedRequest function is used to authenticate user via Instagram and get access token.
Declaration
Swift
func unSignedRequest()
Return Value
nil
-
clearCache function is used to clear all the stored sessions and cache memory.
Declaration
Swift
func clearCache()
Return Value
nil
-
checkRequestForCallbackURL function is used to fetch authentication token from URLRequest
Declaration
Swift
func checkRequestForCallbackURL(request: URLRequest)
Parameters
request
URLRequest
Return Value
nil
-
handleAuth function is used to get user’s Authentication token.
Declaration
Swift
func handleAuth(authToken: String)
Parameters
authToken
user authentication token
Return Value
nil
-
Undocumented
Declaration
Swift
func webView(_ webView: WKWebView, didFinish navigation: WKNavigation!)
-
Undocumented
Declaration
Swift
func webView(_ webView: WKWebView, decidePolicyFor navigationAction: WKNavigationAction, decisionHandler: @escaping (WKNavigationActionPolicy) -> Void)
-
Undocumented
Declaration
Swift
func webView(_ webView: WKWebView, decidePolicyFor navigationResponse: WKNavigationResponse, decisionHandler: @escaping (WKNavigationResponsePolicy) -> Void)


QUESTION #1
Which uAdmin function sends email using system configured variables?
QUESTION #2
What are the required uAdmin functions for sender email configuration?
QUESTION #3
What is the structure of your answer in number 1 to be followed in order to send an email?
QUESTION #4
The name of the sender is John Doe.
Which uAdmin function will match the given statement above?
QUESTION #5
The username of the sender is<EMAIL_ADDRESS>and the password is 123456.
Which uAdmin function will match the given statement above?
QUESTION #6
The SMTP server address is smtp.gmail.com and the SMTP Port is 465.
Which uAdmin function will match the given statement above?
QUESTION #7
The name of the sender is Allen Dale. His username is<EMAIL_ADDRESS>and password is dale123.
Which uAdmin function will match the given statement above?
QUESTION #8
An email will be sent to<EMAIL_ADDRESS>The subject is Greeting and the message is Hello, my friend!.
Which uAdmin function will match the given statement above?
QUESTION #9
The name of the sender is David Price. His username is<EMAIL_ADDRESS>and password is zymurgy. The SMTP server address is smtp.mail.yahoo.com and the SMTP Port is 465.
Which uAdmin function will match the given statement above?
QUESTION #10
An email will be sent to<EMAIL_ADDRESS>and<EMAIL_ADDRESS>with a carbon copy of<EMAIL_ADDRESS>and a blind carbon copy of<EMAIL_ADDRESS>The subject is Field Trip and the message is Hello guys! Are you going to the field trip today?.
Which uAdmin function will match the given statement above?
QUESTION #11
From:
To:
CC:
BCC:
Subject:
Message:
The username of the sender is<EMAIL_ADDRESS>and the password is live0670.
Which uAdmin function will match the given statement above?
QUESTION #12
From:
To:
CC:
BCC:
Subject:
Message:
The username of the sender is<EMAIL_ADDRESS>and the password is dec061971.
Which uAdmin function will match the given statement above?
QUESTION #13
From:
To:
CC:
BCC:
Subject:
Message:
The username of the sender is<EMAIL_ADDRESS>and the password is support123hrservices.
Which uAdmin function will match the given statement above?
QUESTION #14
From:
To:
CC:
BCC:
Subject:
Message:
The username of the sender is<EMAIL_ADDRESS>and the password is miniminimainimo.
Which uAdmin function will match the given statement above?


This repository contains **Dockerfile** of [nginx](http://nginx.org/) for [Docker](https://www.docker.com/)'s [automated build](https://registry.hub.docker.com/u/alexisvincent/nginx/) published to the public [Docker Hub Registry](https://registry.hub.docker.com/).
### Base Docker Image
* [alexisvincent/ubuntu](https://registry.hub.docker.com/u/alexisvincent/ubuntu/)
### Installation
1. Install [Docker](https://www.docker.com/).
2. Download [automated build](https://registry.hub.docker.com/u/alexisvincent/nginx/) from public [Docker Hub Registry](https://registry.hub.docker.com/): `docker pull alexisvincent/nginx`
(alternatively, you can build an image from the Dockerfile: `docker build -t="alexisvincent/nginx" github.com/alexisvincent/nginx`)
### Usage
docker run -d -p 80:80 alexisvincent/nginx
#### Attach persistent/shared directories
docker run -d -p 80:80 -v :/etc/nginx/sites-enabled -v :/etc/nginx/certs alexisvincent/nginx
After few seconds, open `http://` to see the welcome page.


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An asynchronous job.
Public Properties | |
| final const | STATUS_ACTIVE = 'in_progress' |
| final const | STATUS_FAIL = 'failed' |
| final const | STATUS_QUEUED = 'not_started' |
| final const | STATUS_SUCCESS = 'succeeded' |
| final const | TYPE = 'job' |
| Public Properties inherited from AbstractEntity | |
| const | TYPE = '' |
All entity classes must redeclare this to match their resource_type . More... | |
Protected Properties | |
| final const | DIR = 'jobs' |
| const | MAP |
| Protected Properties inherited from AbstractEntity | |
| const | DIR = '' |
| All entity classes must redeclare this to match their REST directory. More... | |
| const | OPT_FIELDS = [] |
| Protected Properties inherited from Data | |
| readonly Api Api | $api |
| array array self[] AbstractEntity[] | $data = [] |
| array bool[] | $diff = [] |
| const | MAP = [] |
Public Methods | |
| magic null Project | getNewProject () |
| magic null Task | getNewTask () |
| magic string | getResourceSubtype () |
| magic string | getStatus () |
| bool | isActive () |
| Whether the job is in progress. More... | |
| bool | isDone () |
| Whether the job has completed successfully or failed. More... | |
| bool | isFailed () |
| Whether the job failed. More... | |
| bool | isQueued () |
| Whether the job has yet to be started. More... | |
| bool | isSuccessful () |
| Whether the job completed successfully. More... | |
| magic bool | ofDuplicateProject () |
| magic bool | ofDuplicateTask () |
| $this | wait (callable $spinner=null) |
| Sleeps a few seconds between reloads until the job completes successfully or fails. More... | |
| Public Methods inherited from AbstractEntity | |
| string | __toString () |
| The entity's canonical REST path. More... | |
| null string | getGid () |
| bool | hasGid () |
| $this | reload () |
| Fully reloads the entity from Asana. More... | |
| Public Methods inherited from Data | |
| mixed | __call (string $method, array $args) |
| Magic method handler. More... | |
| __construct (Api|self $caller, array $data=[]) | |
| array | __serialize () |
| void | __unserialize (array $data) |
| bool | isDiff () |
| Whether the instance has changes. More... | |
| array | jsonSerialize () |
| bool | offsetExists (mixed $offset) |
| mixed | offsetGet (mixed $offset) |
| void | offsetSet (mixed $offset, mixed $value) |
| void | offsetUnset (mixed $offset) |
| array | toArray (bool $diff=false) |
| Dehydrated data. More... | |
| Public Methods inherited from ImmutableArrayTrait | |
| void | offsetSet (mixed $offset, mixed $value) |
| Throws unless overridden. More... | |
Additional Inherited Members | |
| Protected Methods inherited from AbstractEntity | |
| mixed | _get (string $field) |
| Lazy-loads missing fields. More... | |
| void | _reload (string $field) |
| void | _setData (array $data) |
| Protected Methods inherited from Data | |
| bool | _has (string $field) |
Magic method: hasField() More... | |
| T | _hydrate (string $class, $item) |
| Sub-data factory that draws from the entity pool. More... | |
| bool | _is (string $field) |
Magic method: isField() More... | |
| bool | _of (string $resourceSubtype) |
Magic method: ofResourceSubtypeValue() More... | |
| array | _select (string|iterable $subject, callable $filter,... $args) |
Magic method: selectField(callable $filter) More... | |
| $this | _set (string $field, $value) |
Magic method: setField(mixed $value) More... | |
| void | _setField (string $field, $value) |
| Sets a value, hydrating if mapped, and clears the diff. More... | |
|
protected |
| magic null Project getNewProject | ( | ) |
| magic null Task getNewTask | ( | ) |
| magic string getResourceSubtype | ( | ) |
| magic string getStatus | ( | ) |
|
final |
Whether the job is in progress.
|
final |
Whether the job has completed successfully or failed.
|
final |
Whether the job failed.
|
final |
Whether the job has yet to be started.
|
final |
Whether the job completed successfully.
| magic bool ofDuplicateProject | ( | ) |
| magic bool ofDuplicateTask | ( | ) |


The Blue Hour อนธการ
(Original Motion Picture Soundtrack)
Music by Chapavich Temnitikul
Won 2 Best Original Score awarded by Starpics Thai Film Awards 13th and Bangkok Critics Assembly 26th
Available now
Won 2 Best Original Score awarded by Starpics Thai Film Awards 13th and Bangkok Critics Assembly 26th
Available now
Available now


Note: During scale-down instances will wait in a Terminating state for 10 minutes to allow for connection draining before termination.
Please Note: AWS will always keep instances balanced across availability zones.
Make sure that the minimum number of required up-to-date instances are present in each AZ before using scale-in to remove out-of-date instances.
Instances with Instance Protection are never terminated!


| Pesticides |
Agriculture, landscape |
Dermal, inhalation, ingestion |
Numerous: carcinogenic, Asthma, COPD, cardiopulmonary etc. |
Increase in plant disease |
| Veterinary medicines |
Veterinary, agriculture |
Dermal, ingestion |
Antimicrobial resistance |
Increased temperature |
| Ozone |
Construction, transportation, energy, agriculture, traffic warden, oil and gas etc. |
Inhalation |
Asthma, COPD, cardiopulmonary |
Increased temperature |
| PAHs |
Construction, transportation, energy, agriculture, traffic warden, oil and gas, firefighting etc. |
Inhalation |
Cardiopulmonary, carcinogenic |
Increased dust, forest fires |
| Pathogenic microorganism |
Fishing, agriculture, sanitation, most outdoor work |
Dermal, Inhalation, ingestion |
Infectious disease |
Increased flooding, soil and water contamination |
| Vector-borne infectious agents |
Food-animal production, most outdoor work |
Dermal |
Infectious disease |
Increased range of vectors |
| Soil dust |
Agriculture, construction, most outdoor work |
Inhalation, ingestion |
Silicosis, cardiopulmonary |
Drier conditions |
| Industrial processing chemicals |
Chemical manufacture, emergency response operations |
Dermal, Inhalation, ingestion |
Numerous: Carcinogenic, Asthma, COPD, cardiopulmonary etc. |
Flood, wildfires |
| Wildfire smoke |
Firefighting, agriculture, |
Inhalation |
Respiratory |
Drier conditions |
| Exposure to extreme condition (temperature and humidity) |
Firefighting, oil and gas workers, and all outdoor workers exposed to direct sun, |
Dermal, Inhalation, Ingestion |
Heat exhaustion, heat stroke, chronic kidney disease, chemical poisoning, injury |
Extreme condition |
| Other indirect climate-related hazards |
Low-income groups with limited health protection; workers with existing non-climate health problems affected by heat |
Dermal, inhalation, Ingestion, other |
Infectious diseases, non-communicable diseases, mental health issues, etc. |
Others |


Tame "Animal"
"The Animal" is a marginally inspired comedy that only manages to lumber along, generating just enough momentum to keep it from stalling. It's clunky and slow, like watching an 18-wheeler trying to accelerate up a hill. There are certainly better things you can do with your time.
Actually, if you've seen the trailer, then you already know the plot and have seen its funniest moments. The story centers on bland Marvin (Rob Schneider), who is an Evidence Clerk at the local police department that yearns to be a real officer. But he's afflicted with Loser-itis.   This is actually bad because you can't like a character if you can't develop sympathy for him. We never do, and it may be just as well that he drives off a cliff and plummets to the canyon floor.
However, Marvin is found by an eccentric doctor (Michael Caton) who uses a radical and experimental procedure to save him, implanting our doofus with various animal parts and organs. As a result, Marvin develops heightened senses and increased agility and speed. He can smell drugs hidden anywhere on a body, swim with the speed of a dolphin, and can run as fast as a cheetah. Imagine the comedic possibilities that arise from this operation. With his enhanced abilities, he could now reap vengeance on all those who have shunned him.
However, the spirit of the film takes a raunchy turn, and instead, Marvin spends most of his time trying to subdue or satiate his voracious appetite and his animalistic, sexual urges. Goats beware! He also chases cats, urinates to mark his territory, or growls at his enemies. What he should've done was stick his head in the sand like an ostrich.
 "It's reverse racism," he declares as he blows smoke into the faces of strangers but none of them says anything. This element doesn't work the first time it's mentioned, and it becomes increasingly trite with every recurrence.
You don't have to be as wise as an owl to realize that "The Animal" is tame. If there's any reason to see this film, it's to see Colleen Haskell who makes her big screen debut. Remember her? She was voted off in week 11 of the 13-week program, "Survivor." Here, she plays Marvin's sunny love interest. While her role required very little actual acting, she seemed very comfortable (even when Marvin licks the side of her face like a lapping dog...yuck!). With her adorable disposition, radiant smile, and playful innocence, she could be a Meg Ryan in the making. It's too bad that she's in such a mediocre offering
Grade: C-
S: 1 out of 3 L: 0 out of 3 V: 1 out of 3
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


The DCOMPERM
sample provides source code and several wrapper functions to simplify the
process of manipulating the access and launch permissions for a COM server.
Additionally, this sample provides code which demonstrates how to set and retrieve
the RunAs password for a COM server.
DWORD ChangeDefaultAccessACL ( LPTSTR tszPrincipal, BOOL fSetPrincipal, BOOL fPermit, DWORD dwAccessMask ); |
Description:
Modify the default access access control list. The system
uses the default access ACL to determine if a principal is allowed to access
the COM server if the COM server does not have its own access ACL in the AppID section of the registry.
Parameters:
|
tszPrincipal |
Name of user or group (e.g. "redmond\johndoe") |
|
fSetPrincipal |
TRUE if you want to add/update the principal's entry in the ACL,
FALSE if you want to remove the principal from the ACL |
|
fPermit |
TRUE if you want to allow the principal to access the object, FALSE
if you want to prevent the principal from accessing the object |
|
dwAccessMask |
Specifies what type of access the principal is to be given. Can be any combination of the COM_RIGHTS_*
values |
(Note that the
Permit flag applies only when SetPrincipal is TRUE.)
DWORD ChangeAppIDAccessACL ( LPTSTR tszAppID, LPTSTR tszPrincipal, BOOL fSetPrincipal, BOOL fPermit, DWORD dwAccessMask ); |
Modify an AppID's access access control
list. The system uses the AppID access ACL to
determine if a principal is allowed to access the COM server associated with
the AppID.
Parameters:
|
tszAppID |
The Application ID you wish to modify (e.g.
"{99999999-9999-9999-9999-00AA00BBF7C7}") |
|
tszPrincipal |
Name of user or group (e.g. "redmond\johndoe") |
|
fSetPrincipal |
TRUE if you want to add/update the principal's entry in the ACL,
FALSE if you want to remove the principal from the ACL |
|
fPermit |
TRUE if you want to allow the principal to access the object,
FALSE if you want to prevent the principal from accessing the object |
|
dwAccessMask |
Specifies what type of access the principal is to be given. Can be any combination of the COM_RIGHTS_*
values |
(Note that the
Permit flag applies only when SetPrincipal is TRUE.)
DWORD ChangeDefaultLaunchACL ( LPTSTR tszPrincipal, BOOL fSetPrincipal, BOOL fPermit, DWORD dwAccessMask ); |
Modify the
default launch access control list. The system uses the default launch ACL to
determine if a principal is allowed to launch a COM server if the COM server
does not have its own launch ACL in the AppID section
of the registry.
Parameters:
|
tszPrincipal |
Name of user or group (e.g. "redmond\johndoe") |
|
fSetPrincipal |
TRUE if you want to add/update the principal's entry in the ACL,
FALSE if you want to remove the principal from the ACL |
|
fPermit |
TRUE if you want to allow the principal to launch the object
FALSE if you want to prevent the principal from launching the object |
|
dwAccessMask |
Specifies what type of access the principal is to be given. Can be any combination of the COM_RIGHTS_*
values |
(Note that the
Permit flag applies only when SetPrincipal is TRUE.)
DWORD ChangeMachineAccessACL ( LPTSTR tszPrincipal, BOOL fSetPrincipal, BOOL fPermit, DWORD dwAccessMask ); |
Modify the
machine-wide access access control list. The system
uses the machine-wide access ACL to determine the type of access a principal
has to servers on this machine. This
value will override any default or application specific settings.
Parameters:
|
tszPrincipal |
Name of user or group (e.g. "redmond\johndoe") |
|
fSetPrincipal |
TRUE if you want to add/update the principal's entry in the ACL,
FALSE if you want to remove the principal from the ACL |
|
fPermit |
TRUE if you want to allow the principal to access the object, FALSE
if you want to prevent the principal from accessing the object |
|
dwAccessMask |
Specifies what type of access the principal is to be given. Can be any combination of the COM_RIGHTS_*
values |
(Note that the
Permit flag applies only when SetPrincipal is TRUE.)
DWORD ChangeMachineLaunchACL ( LPTSTR tszPrincipal, BOOL fSetPrincipal, BOOL fPermit, DWORD dwAccessMask ); |
Modify the
machine-wide launch access control list. The system uses the machine-wide launch
ACL to determine the type of launch and/or activation privileges a principal
has for servers on this machine. This
value will override any default or application specific settings.
Parameters:
|
tszPrincipal |
Name of user or group (e.g. "redmond\johndoe") |
|
fSetPrincipal |
TRUE if you want to add/update the principal's entry in the ACL,
FALSE if you want to remove the principal from the ACL |
|
fPermit |
TRUE if you want to allow the principal to access the object,
FALSE if you want to prevent the principal from accessing the object |
|
dwAccessMask |
Specifies what type of access the principal is to be given. Can be any combination of the COM_RIGHTS_*
values |
(Note that the
Permit flag applies only when SetPrincipal is TRUE.)
DWORD ChangeAppIDLaunchACL ( LPTSTR tszAppID, LPTSTR tszPrincipal, BOOL fSetPrincipal, BOOL fPermit, DWORD dwAccessMask ); |
Modify an AppID's launch access control list. The system uses the AppID launch ACL to determine if a principal (a user or
group of users) is allowed to launch the COM server associated with the AppID.
Parameters:
|
tszAppID |
The Application ID you wish to modify (e.g.
"{99999999-9999-9999-9999-00AA00BBF7C7}") |
|
tszPrincipal |
Name of user or group (e.g. "redmond\johndoe") |
|
fSetPrincipal |
TRUE if you want to add/update the principal's entry in the ACL,
FALSE if you want to remove the principal from the ACL |
|
fPermit |
TRUE if you want to allow the principal to launch the object
FALSE if you want to prevent the principal from launching the object |
|
dwAccessMask |
Specifies what type of access the principal is to be given. Can be any combination of the COM_RIGHTS_*
values |
(Note that the
Permit flag applies only when SetPrincipal is TRUE.)
DWORD GetRunAsPassword ( LPTSTR tszAppID, LPTSTR tszPassword ); |
Retrieves the RunAs password for an AppID.
Parameters:
|
tszAppID |
The Application ID you wish to modify (e.g. "{99999999-9999-9999-9999-00AA00BBF7C7}") |
|
tszPassword |
Password of the user you have specified in the RunAs named value under the AppID
registry key. |
DWORD SetRunAsPassword ( LPTSTR tszAppID, LPTSTR tszPrincipal, LPTSTR tszPassword ); |
Sets the RunAs password for an AppID. Note that if you have specified the RunAs named value to "Interactive User" you do
not need to set the RunAs password.
Parameters:
|
tszAppID |
The Application ID you wish to modify (e.g. "{99999999-9999-9999-9999-00AA00BBF7C7}") |
|
tszPrincipal |
Name of the principal you have specified in the RunAs named value under the AppID
registry key |
|
tszPassword |
Password of the user you have specified in the RunAs named value under the AppID
registry key. |


A document‚s hash value is a number which calculates the hash function from the information provided in the document. Hash values for different documents should be as different as possible.


Result
| ID | Subject | Assignment Marks | Exam Marks | Status |
|---|---|---|---|---|
| {{ row.id }} | {{ row.subject_id.subject_name }} | {{ row.subject_assignment_marks }} | {{ row.subject_exam_marks }} | {% if row.subject_exam_marks >= 40 %} PASS {% else %} FAIL {% endif %} |
| ID | Subject | Assignment Marks | Exam Marks | Status |
|---|---|---|---|---|
| {{ row.id }} | {{ row.subject_id.subject_name }} | {{ row.subject_assignment_marks }} | {{ row.subject_exam_marks }} | {% if row.subject_exam_marks >= 40 %} PASS {% else %} FAIL {% endif %} |


Homemade Turkish Yogurt
May 29, 2020
As an expat I am not sure if I should consider myself as expat or immigrant. , I miss sour Turkish yogurt. The best alternative I could find was Bulgarian yogurt trivia: my grandparents from both sides are immigrants from Bulgaria. at Wholefoods. But you can easily make your own sour Turkish yogurt.
Step 0: Ingredients
- Whole milk as much as your glass container(s) can contain
- Tablespoon of starter yogurt
- Thermometer
- Glass container(s) with a lid
- Your favorite blanket
Step 1: Boil the Milk
Boil the milk and pour to your containers. Wait till the temperature drops to 115F.
Normally you wouldn’t have to boil milk to get to fermentation temperature if your house is warm enough. But the bacteria working for us are active at 110F - 115F temperatures. Thus, pouring milk to containers while it’s super hot will heat the containers which will help us keep the temperature in the right range longer.
Step 2: Mix the Starter
Take few tablespoons of milk and mixed it with yogurt till the mixture is smooth in a small bowl. Add this mixture to the milk in 115F and stir it gently. Put the lids on, and cover the containers with a blanket. Put it in the warmest spot in your house.
Step 3: Wait
Wait for at least 12 hours while your bacteria are doing their job, then put it in the fridge. Do the tasting after the yogurt is cold.
Optional: Drained Yogurt
For many mezes we prepare for Raki tables There should be a blogpost for Turkish Raki tables and my meze recipes we use a dense version of Yogurt. To get the right viscosity for your mezes, you can pour yogurt to a strainer and keep it in the fridge overnight. The next morning you’ll have a perfect drained yogurt. Do not throw away the water (or juice?) add it to your hummus or shakes.
Optional: DIY Yogurt Machine:
The longer the milk is in the right temperature range, the more sour your yogurt will be. So it is essential to have a setup where you can keep the temperature the same for a long time. Below is an image for my DIY yogurt machine. Here I use a box, styrofoam, and aluminium bag, and styrofoam stand to put the containers in. It works like a charm!


Why Queen is said to be a big fan of Kate Middleton
Queen Elizabeth II is said to have a lot of respect for her granddaughter-in-law
by Milo BoydThe Duchess of Cambridge has won praise from her husband's granddaughter, with the Queen apparently impressed by her 'keep calm' attitude.
Kate Middleton has a big fan in the form of Queen Elizabeth, reports The Mirror .
While the two royals don't have a close and intimate relationship, a royal insider says the Queen respects Prince William's wife for her "keep calm and carry on attitude".
“The Queen is a fan,” a source told Vanity Fair.
“Kate is unflappable. Her mantra is very like the Queen’s keep calm and carry on approach in life, and she has the added benefit of making the Royal Family seem almost normal and in touch.”
At the end of last year The Queen made a very public gesture of friendship towards Kate.
The monarch handed her granddaughter-in-law the Royal Family Order - the highest honour a female member of the family can receive.
According to Claudia Joseph, who has written a book about Kate's life, the mum-of-three is having a bumper year.
She said: "It feels very much like this has been Kate’s year, she looks happy, in control and there’s a new confidence about her.”
For the latest news in and around Bristol, check back on Bristol Live's homepage


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{% load otree staticfiles %}
You are randomly paired with another experimental participant from this session. You will not know who this participant is, and neither will he/she know who you are.
There are two roles in this experiment: Participant 1 and Participant 2. . All participants will be randomly assigned to one of these roles. Before you start the experiment, all of you will learn your roles.
After all participants learn their roles, Participant 1 receives the initial amount in ECU. Participant 1 decides how many ECU (s)he decides to transfer to Participant 2.
Participant 2 may agree with this proposal of Participant 1, in which case both participants receive the shares proposed by Participant 1. If Participant 2 does ot agree with this proposal of Participant 1 --- both participants receive 0.


9.3. Type System
The Type interface in Presto is used to implement a type in the SQL language. Presto ships with a number of built-in types, like VarcharType and BigintType. A Plugin can provide new types by returning them from getServices(). Below is a high level overview of the Type interface, for more details see the JavaDocs for Type.
Native container type:
All types define the getJavaType() method, frequently referred to as the “native container type”. This is the Java type used to hold values during execution and to store them in a Block. For example, this is the type used in the Java code that implements functions that produce or consume this Type.
Native encoding:
The interpretation of a value in its native container type form is defined by its Type. For some types, such as BigintType, it matches the Java interpretation of the native container type (64bit 2’s complement). However, for other types such as TimestampWithTimeZoneType, which also uses long for its native container type, the value stored in the long is a 8byte binary value combining the timezone and the milliseconds since the unix epoch. In particular, this means that you cannot compare two native values and expect a meaningful result, without knowing the native encoding.
Type signature:
The signature of a type defines its identity, and also encodes some general information about the type, such as its type parameters (if it’s parametric), and its literal parameters. The literal parameters are used in types like VARCHAR(10).


Discord has introduced a new feature, slash commands. You can see an example here.
Using these requires a new thing when inviting the bot, so servers that have previously had the bot in them will need to reinvite it.
You can find an invite here, or by using the f!invite command.
I highly recommend using the slash command variant of a command if it exists. They come with better help than we can supply.


Born and Raised between France and the US, I am interested in the intersection between Business, Technology and Humanity. I was educated in Business and Software Engineering, and I have always been fond of helping people find solutions to their problems, by using cutting edge Technologies.


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dpkg-source in dpkg 1.3.0 through 1.18.23 is able to use a non-GNU patch program and does not offer a protection mechanism for blank-indented diff hunks, which allows remote attackers to conduct directory traversal attacks via a crafted Debian source package, as demonstrated by use of dpkg-source on NetBSD.
In Libgcrypt before 1.7.7, an attacker who learns the EdDSA session key (from side-channel observation during the signing process) can easily recover the long-term secret key. 1.7.7 makes a cipher/ecc-eddsa.c change to store this session key in secure memory, to ensure that constant-time point operations are used in the MPI library.
libpcre1 in PCRE 8.40 and libpcre2 in PCRE2 10.23 allow remote attackers to cause a denial of service (segmentation violation for read access, and application crash) by triggering an invalid Unicode property lookup.
The _pcre32_xclass function in pcre_xclass.c in libpcre1 in PCRE 8.40 allows remote attackers to cause a denial of service (invalid memory read) via a crafted file.
Stack-based buffer overflow in the pcre32_copy_substring function in pcre_get.c in libpcre1 in PCRE 8.40 allows remote attackers to cause a denial of service (WRITE of size 4) or possibly have unspecified other impact via a crafted file.
The xdr_bytes and xdr_string functions in the GNU C Library (aka glibc or libc6) 2.25 mishandle failures of buffer deserialization, which allows remote attackers to cause a denial of service (virtual memory allocation, or memory consumption if an overcommit setting is not used) via a crafted UDP packet to port 111, a related issue to CVE-2017-8779.
The pop_fail_stack function in the GNU C Library (aka glibc or libc6) allows context-dependent attackers to cause a denial of service (assertion failure and application crash) via vectors related to extended regular expression processing.
The iconv program in the GNU C Library (aka glibc or libc6) 2.25 and earlier, when invoked with the -c option, enters an infinite loop when processing invalid multi-byte input sequences, leading to a denial of service.
An issue was discovered in certain Apple products. iOS before 10.3.2 is affected. macOS before 10.12.5 is affected. tvOS before 10.2.1 is affected. watchOS before 3.2.2 is affected. The issue involves the "SQLite" component. A use-after-free vulnerability allows remote attackers to execute arbitrary code or cause a denial of service (application crash) via a crafted SQL statement.
An issue was discovered in certain Apple products. iOS before 10.3.2 is affected. macOS before 10.12.5 is affected. tvOS before 10.2.1 is affected. watchOS before 3.2.2 is affected. The issue involves the "SQLite" component. It allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption and application crash) via a crafted SQL statement.
An issue was discovered in certain Apple products. iOS before 10.3.2 is affected. macOS before 10.12.5 is affected. The issue involves the "SQLite" component. It allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption and application crash) via a crafted web site.
An issue was discovered in certain Apple products. iOS before 10.3.2 is affected. macOS before 10.12.5 is affected. tvOS before 10.2.1 is affected. watchOS before 3.2.2 is affected. The issue involves the "SQLite" component. It allows remote attackers to execute arbitrary code or cause a denial of service (buffer overflow and application crash) via a crafted SQL statement.


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The best pizza you'll ever taste
Order your pizza and we wil deliver it to your location.
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Amor De Mi Vida
Te amo desde el fondo de mi corazón
Hello baby! HAPPY THIRD MONTHSARY!! but here we are spending it at home and apart. We could've been at wingers or samgyup but this pandemic
is stopping us in doing so huhu NEVERTHELESS! I made a simple gesture to make you kilig and happy (maybe) at least for an
itty bitty hehe I hope we will get through this relationship being apart and not seeing each other. I hope your love for me will not fade.
I hope we will get past this with you still by my side. I'm sorry baby, this is all I can do for now, given our situation huhu
but I am trying my best!


Hi,
I recently posted a question on a local (NZ) forum asking some questions about my proposed PV diversion design, as I have a slightly unusual setup in terms of my hot water cylinder wiring.
As part of that discussion a user posted this comment;
I am assuming that the designer of the system you have linked to is on a "nett metered" billing plan for his grid connected solar. Which means he can "get away" with a system that simply switches the element on in bursts. In NZ you have to have a meter that separately records imported and exported power. Which means that a system that can only control the element in bursts could actually cause higher power bills.
So from what I understand, in NZ we have a special import/export meter installed when we get solar PV installed. This records both import and export on separate meters. We then get a bill with a charge for the total import, and a separate line item with a credit for any export. I believe this is different to how your grid connected systems are metered in the UK?
Is what he is saying correct, in that by using a PV diverter (based on Robin's design) using bursts of power to the cylinder element, the import meter will pick up anything in excess of what is being generated by the PV panels, and charge me?
Or will the diverter cycle the load quick enough to ensure the load/import never gets registered? Can the SSR cycle it quick enough to do this, seeing as it can only 'switch' on zero crossings?
I am new to all this stuff and am trying my hardest to get my head around it all!
Here is the forum thread if you are interested; http://www.geekzone.co.nz/forums.asp?forumid=73&topicid=153861
Best regards,
Ben
Re: PV diversion - will it still work with separate import/export meter registers?
I think the meters the Brits use generally only count energy in the forward direction. Once the energy reverses or drops below the anti-creep threshold they stop counting. The meters you guys use in NZ sound like the ones we use here in Aus. When the power is below the anti-creep threshold nothing gets counted, otherwise it's always getting counted in one of two registers (import or export) depending on the power direction.
I think your poster is claiming that because the meter needs to keep track of both directions accurately, it's going to be much more sensitive to direction changes, i.e. have a much smaller "sweet spot". That's certainly possible, but I don't know that it's inevitable.
There's a long discussion here: http://openenergymonitor.org/emon/node/5237 on meter sweet spots. In that thread, I posted the attached scope trace that shows just how quickly typical metering ICs can detect power reversal when configured to do so. There are more details on my test conditions in the original post, but the red trace is the current, and the yellow trace is the /IRQ signal to alert me the power has changed directions. Whether or not the firmware in your meter does this is another question. I suspect the only way to determine that is to test it.
Re: PV diversion - will it still work with separate import/export meter registers?
Very interesting, thanks dBC. This sort of thing is definitely a little out of my league in terms of having a good understanding, but I will read that thread and try to grasp some more! It is good to know that this system is working for you on a similar type of meter as ours here in NZ. I had always assumed it would, as I know of a few guys here in NZ that have Robins Mk2PVRouter running and according to them it is working well.
I think it might just be a case of hooking it all up and then checking the import/export readings after a month. Currently I have an EmonTX v2 Arduino shield monitoring my feed and it is reporting within 1% of what my electricity provider is billing me - according to their online portal which shows daily totals for both the import/export registers.
So I am pretty confident the EmonTX is accurate - meaning once I hook the PV diversion up I should know pretty quickly if I am being charged for exceeding my 'sweet spot'.
Thanks again for the detailed post.
Ben
Re: PV diversion - will it still work with separate import/export meter registers?
It is good to know that this system is working for you
Actually, I don't have a diverter. I get paid 50c for each kWH I export, with no upper limit. That's way more than I pay for my imports, so if anything I need the opposite of a diverter. The stuff coming off my roof is liquid gold so long as I send it out to the grid rather than use it myself.
Re: PV diversion - will it still work with separate import/export meter registers?
Jeepers - that is pretty generous - whereabouts in Oz are you?
Re: PV diversion - will it still work with separate import/export meter registers?
@dBC - this is the response I received on the Geekzone thread earlier today (apologies for the cross posting but I am a little lost with all this stuff and am trying to get a complete picture using the expertise from both forums!).
Has anyone on the OEM forum tried this sort of approach? Using a variable controller to adjust the amount of power diverted to the HWC? Rather than pulsing/bursting?
In theory it sounds quite promising, but I am completely lost when things like power factors and reactive power are talked about...
Is there any reason this type of diversion hasn't been attempted before (or perhaps it already has and was no good?)? Or is there another reason this won't work?
Appreciate you sharing your expertise in this!
Re: PV diversion - will it still work with separate import/export meter registers?
whereabouts in Oz are you?
SEQ, grandfathered in on a scheme that's no longer available.
I'll leave your diverter switching control question to those who know far more about the options than I do. I just measure it, I don't switch it.
Re: PV diversion - will it still work with separate import/export meter registers?
What you're describing with the "really high current leading edge light dimmer" is phase angle control. It's explained in Robin's article about his diverter. But to avoid problems with interference generated by the fast rising edges (which can go from audio frequencies right up into the radio bands), you need big and expensive filters. That's the main reason why everyone here has opted for burst fire - which has its own problems with flicker if you are on a weak supply. Robin has published a sketch for phase angle control, so it does work.
I'm reasonably certain that phase angle control would work with those pesky meters that don't have a dead band within which you can freely import and export without incuring a charge.
Re: PV diversion - will it still work with separate import/export meter registers?
I'm reasonably certain that phase angle control would work with those pesky meters that don't have a dead band within which you can freely import and export without incurring a charge.
I couldn't get it to work with my 5219 meter.
Re: PV diversion - will it still work with separate import/export meter registers?
"I couldn't get it to work with my 5219 meter." So you're saying that the meter detects and differentiates export and import within one half-cycle then? Do you have any idea about how it responds with a purely reactive load?
Re: PV diversion - will it still work with separate import/export meter registers?
I just tested my energy monitor with ideal inputs of 230V and 2A offset by 90 degrees.
It reads -459.6 VAR and -0.3W so it has ever so slightly flipped into the wrong quadrant (the sign of the reactive is correct, but the real should be 0). But I had to disable the anti-creep feature to see that. With anti-creep enabled it reads -459.6 VAR and 0W.
Re: PV diversion - will it still work with separate import/export meter registers?
That sounds good to me. I won't argue with 0.3 W in 460 var. I've used a capacitor to calibrate Phasecal, and it seems a more positive method to adjust to a reasonably well-defined zero rather than trying to find a flat-topped maximum. But I don't expect everyone to have suitable capacitors to hand. I'm hoping Nick has so that he can enlighten us about his meter.
Re: PV diversion - will it still work with separate import/export meter registers?
I'm lucky enough to have access to a calibrated calibrator, that lets me dial up pretty much anything I want, although this particular model won't let me inject harmonics.
Re: PV diversion - will it still work with separate import/export meter registers?
I'm afraid I don't have much equipment at all.
I tried Robins Phase burst sketch with the meter and it always measured some import. It was some months ago and I used either a kettle or heater as the load.
I then devised a simple mechanism using an Arduino as a timer to control 4 SSR's wired so I could swap the direction the power was going through the meter. Using a 40w bulb and various times I couldn't get the meter not to register some import.
Edit- Robert if you have the equipment I'm happy to put the meter in the post to you, as long as you send it back!!
Re: PV diversion - will it still work with separate import/export meter registers?
Thanks for the offer, but I don't think I'll take you up on that - knowing how stuff can get damaged or go missing in the post! If you're where I think you are, it's too far to come and collect (or deliver). Reactive loads and phase controlled loads (which look reactive on account of the current wave being displaced from the voltage wave) are of course quite different to a burst fired resistive load.


UPDATED: Twelve corpses burnt in OAU mortuary fire
by https://www.facebook.com/CheerfulpraiseAdesoji Adeniyi, Osogbo
Twelve corpses were burnt by fire at the morgue of the Obafemi Awolowo University, Ile-Ife, Osun State.
It was gathered that there was fire outbreak following a power surge around 3.00 an on Tuesday at the Department of Anatomy and Cell Biology at the Obafemi Awolowo University, Ile-Ife, where the corpses were kept.
An informed source disclosed that twelve out of 102 bodies that were kept in the morgue were affected by the fire outbreak.
According to the source, who preferred not to be named, it was combined efforts of the Security and Fire Services Unit of the university that averted the spread of the fire.
Read Also; Fire burns 12 corpses in OAU’s morgue
Meanwhile, the university authorities have made an arrangement to inform those who have kept bodies (corpses) in the morgue about the incident.
The Public Relations Officer of the university, Mr. Abiodun Olarewaju, in a statement, said the Vice Chancellor, Prof. Eyitope Ogunbodede, had led principal officers of the OAU to the scene of the incident to assess the level of damage.
Olarewaju, who said the vice chancellor during his visit ordered immediate repairs of the affected areas, disclosed that the Vice-Chancellor has also constituted a three-member committee to look into the immediate and remote causes of the fire outbreak.


Basics of the Web
The web is a collection of documents which are made out of HTML. HTML stands
for Hypertext Markup Language.
HTML glues everything (text, videos, images, etc)
together. Documents can contain links to other HTML documents.
This interconnection
of documents gives the Web its name.
Major Components of the Web
Your computer uses an application called a browser to view HTML documents that reside on other servers on the Internet.Composition of HTML
HTML is made up of:HTML uses tags to change the appearance of content in a document. They start
with an opening tag and end with the closing tag.
The closing tag shares the
same name as the opening tag but also has a slash in front of the tag's name.
The content being modified by the tag lies between
the opening and closing tag.
HTML attributes
HTML attributes are tags that include attributes within them. These attributes have values.
Examples are:anchor tag - links to another page
attribute: href
value: url of page
image tag - displays an image on the page
attribute: src
value: location of image
attribute: alt
value: text if image doesn't appear
Some tags do not have closing tags if there is no content - the image tag is one of these.
Whitespace:
In HTML, all whitespace turns into a single space. We use tags to control
how whitespace appears on our page.
Example tags:
br - line break (void tag)
p - paragraph - has opening and closing tag - content between tags will
be contained in the paragraph
Block vs Inline
Inline tags are just text. Block tags draw invisible boxes around its content and can have a height and width.
HTML structure
A complete HTML document includes:
doctype: type of document
html tag: at beginning and end of document
head tag: contains title tag and other meta data (CSS and JavaScript)
body tag: contains document content
We are human but computers are not...
Computers can only do what we ask them to do. If we make a mistake in our
programming, unexpected results may occur.
If we forget how to do something,
we know we can always look it up. It's impossible to remember everything.


An object that is in motion will not change its velocity unless a force acts upon it. This is known as uniform motion.
This star is alone (no surrounding forces) and moves the length of its diameter every second.
Elapsed time: 0s


--- layout: archive title: Zulip Chat Archive permalink: /stream/113489-new-members/topic/Weird.20error.20message.html ---
I'm trying to use nat.prime.coprime_iff_not_dvd, which has signature nat.prime.coprime_iff_not_dvd : nat.prime ?M_1 → (nat.coprime ?M_1 ?M_2 ↔ ¬?M_1 ∣ ?M_2). But when I try to call it, I get an "maximum class-instance resolution depth has been reached" error, and I have no idea why.
We need more context
Could you try to get a minimized version of your code, still showing the error, but not much more?
I have p and q that are nats and I write
"have iffconc: nat.prime p → (nat.coprime p q ↔ ¬ p | q), from apply nat.prime.coprime_iff_not_dvd,"
which is the line that gives the error message.
maybe your p and q are integers
The context says "p q : ℕ", so I don't think so?
You may have the wrong vertical bar
right, make sure that it is \|
which results in a different bar than |
Oh great, that fixed it! Thanks so much
also, from apply
doesn't mean anything
No problem. Welcome to Lean Zulip!
The vertical bar thing drives me nuts. I've been using this notation for years and I still mix the two up periodically. It never sticks in my brain.
to tack onto this question, what exactly does the "maximum class-instance resolution depth has been reached" error message mean, in general? Every time I see it I know it just means I have a type error somewhere but the error never helps me find it and part of that is because I don't know what it means.
Do you know the basics of the type class system?
What it actually means is that Lean was trying to solve a typeclass problem, and it failed because it gave up
because things weren't looking good
What is misleading about the message is that sometimes Lean is trying to solve a completely random problem which you had no intention of making it solve; that's what was happening above.
The real error was some subtle syntax error (|
instead of \|
) and Lean got completely confused; the error message was ultimately irrelevant.
yeah Lean can work on its error messages
The |
indicates the end of something, so Lean was faced with ¬ p
with p : nat
but again, [insert saying about how it's easy to complain]
If you had to choose three error messages that you want to be more informative, which ones would it be?
Error message craft is highly non-trivial. In this case I would say that maximal depth error message would be much easier if it included an indication of what type class problem it failed to solve
That one would certainly be in my top 3
import data.nat.prime example (p : ℕ) : ¬ p := sorry /- maximum class-instance resolution depth has been reached yada yada -/
-- import data.nat.prime example (p : ℕ) : ¬ p := sorry /- type mismatch at application ¬p term p has type ℕ but is expected to have type Prop -/
Excellent. How would you feel about a sort of introductory paragraph (or link to one) about type class search, instance problem and the main candidates tried?
So it's the import which causes it, on this occasion. Of course, the input is garbage
Whenever I see it I assume it's user error (i.e. my fault) rather than Lean actually failing to do type class inference
@Patrick Massot It might be worth opening an issue to start pitching specific improvements
Simon, I don't understand. Do you mean you want a link in the error message?
opening an issue where?
In the community fork?
@Travis Hance the answer to your question is that there's a thing called typeclass inference, which is invoked whenever you leave out an input to a function but the input is in []
square brackets. Lean invokes an algorithm called the type class inference algorithm, which searches through a database trying to find the term you didn't supply explicitly. If the algorithm is called accidentally then of course it can fail -- the unhelpful error message just means "you called typeclass inference and it didn't work"
@Patrick Massot yes community fork. And the link I'm talking about is like Rust errors: https://doc.rust-lang.org/edition-guide/rust-2018/the-compiler/improved-error-messages.html
When you have an error in Rust, it gives you a rule number and if you query the compiler about that rule it explains why it's there.
Printing the failing problem would be nice. But a lot of time time, the question isn't really which problem it failed to solve, it's why the search went deep before failing.
In this case Lean saw ¬ p
and thought "hmm, p
is a natural and it's supposed to be a proposition, that must mean that there is a coercion from naturals to propositions, I'll pass that over to the type class inference system because that handles coercions, and I'll leave it looking for a natural map from natural numbers to true/false statements". Lean fails to find that natural map, because nobody told Lean such a map, but unfortuately along the way it gets very keen on the idea of using canonically_ordered_comm_semiring
in some way, and ends up in an infinite loop.
In Kevin's example, the culprit is with_top.canonically_ordered_comm_semiring
looping for some reason.
 When I read Kevin's message I thought it was a joke, because we suffered of lot with with_zero
and ordered commutative monoids in the perfectoid project. But it seems with_top.canonically_ordered_comm_semiring
is indeed involved here
Printing the failing problem would be nice. But a lot of time time, the question isn't really which problem it failed to solve, it's why the search went deep before failing.
I think what you ask is complicated. Displaying the failing problem would already be immensely useful
for instance, you could see immediately that Lean went looking for a coercion from nat to Prop in that case
I agree, that would be a good start
data.nat.basic
imports algebra.ordered_ring
which contains the offending instance.
Is that in mathlib? Is it universally problematic?
Yes this is all mathlib
It doesn't sound quite right that basics of natural numbers involves canonically ordered commutative semi-ring. That must be my mathematician bad habits...
it's OK, I don't think data.nat.basic is used very much
sounds pretty obscure to me
to be honest I am extremely surprised I didn't see this loop earlier
If you had to choose three error messages that you want to be more informative, which ones would it be?
deterministic timeout
was my #1 choice last week when we were in perfectoid hell
It should have said "just change that Type*
to Type u
and I'll stop complaining"
I think what you ask is complicated. Displaying the failing problem would already be immensely useful
Oh, of course. "Why the search went deep" doesn't really have a well-defined answer. Printing the failing target is helpful when you accidentally invoke type class problems, and it's simple enough to do. But in that situation, you often don't want type class inference to time out, you want it to fail fast. It would be better to see a standard type checking error there than any kind of type class message.
Without the import you get the standard typechecking error, as you know
Right. That instance is worrying. It seems like there are too many metavariables for it to be applied here, so I'm not sure exactly why it's looping.
But it's late, I'm exhausted, not gonna investigate now.
Have a good night! (I should go to bed too)
There is nothing wrong with that instance as written. I assume it is trying to solve a canonically_ordered_comm_semiring ?
kind of problem?
Here's an abbreviated trace:
[class_instances] class-instance resolution trace [class_instances] (0) ?x_3 : has_coe_to_sort ℕ := @coe_sort_trans ?x_5 ?x_6 ?x_7 ?x_8 [class_instances] (1) ?x_7 : has_coe_t_aux ℕ ?x_6 := @coe_base_aux ?x_9 ?x_10 ?x_11 [class_instances] (2) ?x_11 : has_coe ℕ ?x_10 := @nat.cast_coe ?x_14 ?x_15 ?x_16 ?x_17 [class_instances] (3) ?x_16 : has_one (with_zero ?x_18) := @with_zero.has_one ?x_24 ?x_25 [class_instances] (4) ?x_25 : has_one ?x_24 := @with_top.has_one ?x_26 ?x_27 ?x_28 [class_instances] (5) ?x_27 : canonically_ordered_comm_semiring ?x_26 := @with_top.canonically_ordered_comm_semiring ?x_29 ?x_30 ?x_31 ?x_32 ?x_33 [class_instances] (6) ?x_30 : canonically_ordered_comm_semiring ?x_29 := @with_top.canonically_ordered_comm_semiring ?x_34 ?x_35 ?x_36 ?x_37 ?x_38 ...
The problem is a confusion of whether typeclass parameters are supposed to be input or output parameters. The canonically_ordered_comm_semiring
instance assumes it will only ever be called on a concrete type, so the metavariable indicates the problem lies elsewhere. Similarly, with_zero.has_one
assumes it is being called on a concrete type. So we must conclude that for nat.cast_coe
to work correctly, it must only be called on concrete types. But that's not how the coe
instances work, in particular coe_sort_trans
:
instance coe_sort_trans {a : Sort u₁} {b : Sort u₂} [has_coe_t_aux a b] [has_coe_to_sort.{u₂ u₃} b] : has_coe_to_sort.{u₁ u₃} a
This is an instance which invents b
from nothing, as a metavariable. It solves has_coe_to_sort a
by trying to solve has_coe_t_aux a ?b
(which quickly boils down to solving has_coe a ?b
) and then if that is successful it looks for has_coe_to_sort b
. This kind of forward searching doesn't work with the mathlib instances, since you can't enumerate all the types which have coercions from nat (there are infinitely many). In fact due to the DFS search order it never gets around to checking any of them and instead builds infinitely large instances and overflows.
It would be nice if type class inference stops when its argument is a metavariable (note: I'm not saying it should stop when its argument contains a metavariable), so that nat.cast_coe
would just fail, because the type class inference gives up once it has to find an instance of has_one ?x
. If we ever rely on type class inference continuing in these cases, we should just provide more information.
We could have a marker in_param
that says "this argument must be a concrete type for this to trigger", or at least it shouldn't instantiate a metavariable in this slot. Better yet, it seems like this should be the default behavior for anything other than out_param
In this case, that means that canonically_ordered_comm_semiring ?x_26 := @with_top.canonically_ordered_comm_semiring
would not unify, because the metavar ?x_26
is treated as a constant
Of course this sort of defeats the purpose of using a metavariable to begin with, but like I said, has_coe
seems confused about whether its inputs are outputs or not
coe_sort_trans
seems like a very suspicious instance
Still on the thread of weird error messages, why might Lean be giving me an "unexpected end of comment block" error on a blank line?
Hmm never mind I solved it--an earlier comment was causing problems and the error message just manifested on an unrelated line.
the location of this error could be improved (logically it should go on the comment open token, or the entire unclosed comment region)
Mostly what threw me off was that there were several (correct) theorems between the problematic comment and the error message.
Error messages are not the best in Lean 3. I remember realising how much better I had become at fixing up my own code when I had started getting the hang of working out what they were actually telling me. Another tip: don't try and debug the third error message -- the problem might be the unintended chaos caused by the first one.
That's generally true in any programming language, I think. Compilers try their best to recover from an error but it's rarely successful
{% endraw %}Last updated: Apr 24 2020 at 19:02 UTC


In that intense start up haze we occupy, the fact that OpenSensors has turned 1 this month completely passed me by! I feel that occasion should be marked with at least a post to reflect on how far we have come in a year.
An ODI startup
The highlight of the year has to be our inclusion to the Open Data Institute’s startup program.
The ODI’s mission is to unlock the potential of public data held by governments and businesses to help solve the world’s hard problems. As our mission is to build a connected world based on open data and technologies, being part of the ODI’s network of like minded people is the natural home for OpenSensors.
Engineering Middleware is Hard
The original middleware we designed and prototyped for OpenSensors has long been thrown out, actually rewritten several times. We have spent hundreds of engineering hours making it fast and secure. We can now comfortably process millions of messages per second from hundreds of thousands of devices. And most importantly we let each of our users get their own real time feeds of data that they are interested in.
If you told me a year ago that it would take this long to build the middleware we would be happy with, how I would have laughed at you….
Hardware is very Hard
After spending some time working under the radar, towards the middle of 2014 the Internet of Things hypecycle suddenly went into overdrive.
That being said designing and manufacturing hardware products at scale is a significantly different proposition to scaling software. The skill sets necessary to build and manufacture electronics products is rare and laborious. We have found ourselves in the surprising position of prototyping hardware for clients and cities as well as learning the process of manufacturing.
Aims for the coming year
Our central ambition for the next year is to make it very easy for people to find and contribute to rich sources of real time data that is of interest to them.
We have some exciting partnerships and projects with various cities and groups in parking, disability accessibility and smart buildings all publishing open data. We also want to help showcase the excellent work of the many community based environmental sensing projects.
Sunsetting the early access period
As of the 1st of December 2014, we will be charging for private use of the service. Open Data projects will always be free. Private projects will incur a small monthly cost towards the service based on the number of devices you run.
For a full details of the pricing, see https://opensensors.io/pricing


2 references to BeginGetRunspace
System.Management.Automation (2)
engine\hostifaces\PowerShell.cs (2)
4568
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4914
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