Fundamental units
Kilogram (kg), metre (m), second (s), kelvin (K), mole (mol), ampere (A), and candela (cd).
Random error
An error due to inexperience of the observer and the difficulty of reading instruments. It can be reduced by repeated measurements.
Systematic error
An error due to incorrectly calibrated instruments – it is the same for all data points and cannot be reduced by repeated measurements.
Scalar
A physical quantity with magnitude only.
Vector
A physical quantity with magnitude and direction.
Acceleration
Rate of change of velocity with time.
Centripetal acceleration
The acceleration due to a changing velocity direction. It points toward the centre of the circular path and equals (v^2)/r.
Centripetal force
The name of any force or resultant of individual forces that points towards the centre of a circular path.
Displacement
The displacement in a given direction from a fixed origin. It is a vector.
Efficiency
The ratio of useful output work (or power) to input work (or power).
Energy conservation
Energy cannot be destroyed or created. It can be transformed from one form into another.
Equipotential surface
The set of points that have the same gravitational potential.
Escape speed
Speed of object at Earth’s surface so that it will escape from the gravitational field / travel to infinity.
Gravitational field strength
The force per unit mass exerted on a point/small mass.
Gravitational potential
The work done per unit mass in bringing a small/point mass from infinity to the point (in the gravitational field).
Gravitational potential energy
The work done to move a body from infinity to a point in a gravitational field.
Hooke's Law
The tension in a spring is proportional to its extension and opposite to it.
Impulse
The total change in the momentum of a system as a result of a force acting on it.
Law of gravitation
There is an attractive force between any two points masses.
Momentum conservation
If the net external force on a system is zero, the total momentum of the system stays the same.
Newton's 1st Law
An object will remain in a constant velocity (or at rest) unless a resultant external force acts upon it.
Newton's 2nd Law
The rate of change of momentum of a body is proportional to the net force acting on it.
Newton's 3rd Law
When two bodies A and B interact the force that A exerts on B is equal and opposite to the force that B exerts on A.
Orbit
The path of an object when under the influence of just the force of gravitation.
Orbital speed
The speed of a body in an orbit.
Power
The rate at which energy is transferred (or the rate at which work is done).
Translational equilibrium
The state of a system where the net external force is zero.
Velocity
The rate of change with time of the displacement.
Weight
The force of gravitational attraction on a body.
Work
The product of the force times the distance moved by its point of application in the direction of the force.
Adiabatic
A thermodynamic process in which no thermal energy is exchanged. (Q = 0)
Avagadro constant
The number of molecules in one mole of a substance. (6.02 x 10^23)
Boyle's Law
At constant temperature, a fixed quantity of an ideal gas obeys pV = constant.
Entropy
A measure of the disoder of a thermodynamic system.
1st Law of thermodynamics
The thermal energy, Q supplied to a system equals the change in internal energy, ΔU plus any work done, W. (Q=ΔU+W)
Heat (thermal) capacity
The energy/heat required to raise/change the temperature of a substance by 1 K/°C.
Ideal gas
A gas with no intermolecular force that obeys the ideal gas law, PV = nRT at all temperatures, pressures and volumes.
Internal energy
The total (sum of) kinetic and potential energy of the molecules of a substance.
Isothermal
A thermodynamic process in which the temperature stays the same (remains constant).
Pressure
The force normal to an area per unit area.
Pressure-temperature law
At constant volume, a fixed quantity of an ideal gas obeys P/T = constant.
2nd Law of Thermodynamics
The entropy of an isolated system (a system on which no work is being done from the outside) never decreases.
Specific heat capacity
The amount of thermal energy required to raise the temperature of unit mass by 1 K.
Specific latent heat of fusion/vaporization
The energy required to melt/vaporize a unit mass at constant temperature.
Temperature
A measure of the average kinetic energy of the molecules of a substance. It's also the direction of the flow of thermal energy (heat) from high to low temperature/
Volume-temperature law
At constant pressure, a fixed quantity of an ideal gas obeys V/T = constant.
Work
The work done by an ideal gas equals the area under the graph of pressure verses volume. (W = PΔV)
Amplitude
Magnitude of the maximum displacement from the equilibrium position. (The square of the amplitude is proportional to the energy carried by the wave (per unit length/area of the wavefront).
Brewster angle
The angle of incidence for which the reflected light is 100% plane-polarized parallel to the reflecting surface.
Brewster's law
The Brewster angle θa is given by tan θa = n1/n2 when light from a medium with refractive index n1 is incident on a medium with refractive index n2.
Coherent
Two sources of identical waves are in constant phase difference between them.
Electrical conductor
The material that allows the flow of charge through it.
Electrical insulator
The material that does not allow the flow of charge through it.
Law of conservation of electric charge
The total charge of an isolated system cannot change. This means that the total charge before any process should be equal to the total charge afterwards.
Coulomb’s Law
The electrostatic force between two point charges is directly proportional to the product of the two charges and inversely proportional to the square of the distance between them.
Electric field strength
It is defined as the force per unit charge experience by a small positive test charge.
Electric potential difference
The work done per unit charge to move a small positive test charge between two points.
Electronvolt
The work done when a charge equals to one electron charge is taken across a potential difference of 1V.
Electric current
The rate of flow of electrical charge.
Resistance
The ratio of potential difference to the current.
Ohm’s law
The current through the conductor is directly proportional to the potential difference across it, provided the temperature remains constant.
Electromotive force
It is the electrical power supplied by the source per unit current delivered by the source.
Ideal ammeter
The ammeter that has zero resistance.
Ideal voltmeter
The voltmeter that has infinite resistance.
LDR
Increase in light intensity, decrease in resistance of LDR.
Thermistor
Increase in temperature, decrease in resistance of thermistor.
Strain gauge
Increase in length, increase in resistance.
In a magnetic field
F on moving charge is always at right angle to velocity=>circular motion=>Fcircular=Fmagnetic.
If charge enters field at an angle, the path will be a spiral one.
Uniform circular motion
Motion in a circle of constant radius at constant speed.
Angular displacement
Angle through which the object moves (when in circular motion).
Centripental force
Net force acting on an object experiencing acceleration a. Provided by friction, gravity, tension, normal force or others.
Newton's Law of Universal Gravitation
Every point particle in the universe attracts every other point particle with a force that is directly proportional to the product of their masses and inversely proportional to the square of the distance between them. Only for point masses that have equal and opposite forces, they are always attractive and act between all objects in the universe. (F=GMm/r^2)
Gravitational field strength
It is defined as the force per unit mass exerted on a test mass placed at that point. (We assume that all masses are concentrated at its centre.)
Acceleration due to gravity
It varies due to altitude, local geology and shape of the earth (it is not absolutely spherical).
Neutral point
The point between two masses which net gravity is zero.
Nucleons
Protons or neutrons.
Isotopes
Nuclides of the same element with the same proton number but different neutron number.
Coulomb interaction
Repulsive force arising from the protons with the atom being all positive in charge. (long-ranged)
Strong nuclear force/strong interaction
Strong FOA between hadrons that can overcome coulomb interaction. (experienced by both protons and neutrons, short-ranged)
Radioactive half-life
The time taken for half the unstable nuclei in a given sample to decay.
Unified atomic mass
1/12 the mass of a Carbon-12 atom.
Mass detect
The difference between the total mass of the constituents of a nucleus and the mass of the nucleus.
Binding energy
Amount of energy that is released when a nucleus is assembled from its component nucleons.
Binding energy per nucleon
Amount of energy that is released when a nucleus is assembled from its component nucleons divided by the number of nucleons making up the nucleus.
Coming soon in our next update!
Modulation
Intensities of the maxima of the double slit pattern is enveloped and "bounded" by the intensity distribution of the single slit pattern.
Resolution
Minimum distance between distinguisable objects in an image.
Angular resolution
Smallest angular distance between two light sources that can be resolved.
Rayleigh Criterion
Two sources are just resolvable when the first minimum of the diffraction pattern of one of the sources falls on the central maximum of the diffraction pattern of the other source.
Resolvance or Diffraction grating
Ration of the wavelength λ of the light to the smallest difference in wavelength that can be resolved by the diffraction grating Δλ.
Dopple effect
Change in the measured frequency of a wave that results from the relative motion of a source and/or an observer relative to the medium in which the wave is propagated.
Gravitational Potential Energy
Work done by an external force in moving it from infinity to that point. (ΔGPE=Kinetic Energy=>Vesc).
Gravitational Potential
Work done per unit mass by an external force to bring a test mass from infinity to that point.
Electric potential
Work done per unit charge in moving a small positive charge from infinity to that point.
Coming soon in our next update!
Coming soon in our next update!
Absolute magnitude
A measure of how bright an object appears from a distance of 10pc (apparent magnitude).
Apparent brightness
A measure of the brightness of a star as it appears from Earth. (Power/rate of energy received per unit area at Earth).
Apparent magnitude
A measure of the brightness of a star as it appears from Earth in a relative classification/logarithmic scale.
Binary star system
Two stars orbiting a common centre.
Cepheid variable
A star whose luminosity changes periodically due to contractions and expansions of its surface.
Chandrasekhar limit
The largest mass a white dwarf can have. It is about 1.4 solar masses (1.4M)
Constellation
A collection of stars that form a recognizable pattern as viewed from Earth that look close together.
Cosmic microwave background radiation (CMB)
An electromagnetic radiation in the microwave-region that fills in the universe. It has a blackbody spectrum corresponding to a temperature of about 2.7K. It’s also the remnant of the high temperature at time of the Big Bang and provides one of the strong pieces of evidence for the model.
Critical density
The density at which universe will expand forever but rate of expansion will approach zero / the density at which the universe will begin to contract after infinite amount of time.
Galaxy
A collection of 100 billion stars.
Hubble’s law
Distant galaxies are moving away from Earth with speed v that is proportional to their distance d from Earth. (v = Hd) H is Hubble’s constant.
Main sequence
Star undergoing nuclear fusion of hydrogen into helium. They lie on a strip on the HR diagram from top left to bottom right.
Neutron star
An end stage in the evolution of high-mass stars. A collapsed star compose almost entirely of neutrons whose degeneracy pressure balance inward pressure due to gravity. It is very dense and often has a very strong magnetic field and rotates.
Olber’s paradox
The night sky would be bright if there were an infinite number of stars in an eternal universe.
Oppenheimer-Volkoff limit
The largest mass a neutron star can have. It is about 2-3 solar masses. The uncertainty in this limit comes from the fact that the equation of state of the matter inside a neutron star is not precisely known.
Parallax method
A method for measuring the distances to nearby stars that relies on the fact that star appears displaced relative to the background of distant stars when viewed from two different positions in space.
Planetary nebula
The ejection of mass from an exploding red giant star.
Pulsars
Rotating neutron stars emitting radio waves.
Spectral class
A classification of stars according to surface temperature and colour. The classes are OBAFGKM.
Spectroscopic parallax
A method for measuring the distance to a main-sequence star.
Stellar evolution
The evolution of a star from its birth to its life on the main sequence.
Supernova
The ejection of mass from an exploding supergiant star.
White dwarf
An end stage in the evolution of low-mass stars. It is a stable star in which the degeneracy pressure of electrons balances the inward pressure due to gravity.
Wien displacement law
The wavelength at which most of the energy from a star is emitted is related to surface temperature through. (λT = 2.90 x 10^-3 Km)


Hi, I'm Rosslyn
Nice to meet you! I'm a student of code in Northern California, always on the lookout for new tricks to learn and puzzles to crack. Currently satisfying that itch at Dev Bootcamp in SF, where every week I am perscribed a series of coding challenges to sharpen my skills and develop new ones!
Facts About Me
- Ruby is my favourite toy to play with.
- Concise and precise code makes me giddy as a schoolgirl.
- My coding music of choice is loud electronic beats. (Don't worry, I wear headphones.)
- I can and will drink massive amount of tea when made available.
- In my spare time, I enjoy laying in the sun like a cat.
Longing for more?
Let's get to know each other.
Read some stuff I wrote.


In the Getting started series of tutorials, a number of elements are recurring to provide a consistent feeling. In order to make these elements stand out, th following styling options would be added to these elements.
For each of the data sets, some background information on the data used is provided. Still, we do not want it to take too much space. To do so, we make the presentation of each data set collapsible. When clicked on the data set name, more information is provided with also a link to the raw source CSV data:
The titanic data set is available as CSV. The data consists of the following data columns:
The air quality data set is available as CSV....
To raw dataTo make the tasks/questions on what someone wants to do with the data stand out, add this in a callout box:
I'm interested in the age of the titanic passengers.
Similar to the rest of the pandas documentation, these are based on the Bootstrap alerts (as also renderd by sphinx)
Each time a concept is explained, users are also referred to the section in the user guide with more detailed information on the topic. To make it stand out, a badge indicates the reference and the link get special styling:
At the end of each tutorial, a short recap on the main elements to remember is added:


Stereotype Threat
4/12/15
Stereotype threat is a problem faced by millions of individuals around the world. This problem inherently inhibits individuals from pursuing their potential, whether it be in school or the work force. Stereotype threat is defined as the threat of being viewed through a negative lens and feeling obligated to prove the stereotype wrong. This is a huge problem simply because the fear of failure becomes stronger than the drive for success, which creates barriers for the underrepresented individuals seeking equality. Furthermore, this is apparent in their performance for important tests like the SAT, interviews etc.
If I were ever faced with the feeling of stereotype threat I would feel very insecure about my abilities and will likely have a hard time motivating myself to overcome the barriers established by a racist society. The reason for this is because if I am constantly faced with adversity and feel the purpose is hopeless, I will have a harder time motivating myself to face these problems and push through them. If others were suffering from the same problem I would spend time associating myself and inspiring others to associate themselves with groups that create a comfortable environment to talk about their issues. We will devise a plan to take action and speak out against the unfairness in school and the work place.
There are ways to change the environment to make it more welcoming to underrepresented individuals. The first step is educating the mass and provide them with facts debunking the illusion of differences between races. Not only that, we would talk to elected individuals to take action in the ballots and push for further equality and funding for the underrepresented. This would ultimately provide more opportunities for them to speak their opinion and perhaps inspire more to follow. The fact of the matter is, we are all here on this planet and we must learn to coexist. We must also learn to treat others such that we may learn from them becuase there is no legitamate hierarchy in society, only ones devised by uneducated, ignorant individuals.


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You about to delete the entry with the headline {{ ml.markedForRemoval.subEntries[0].headline }}. It will be permanently lost and all the files attached to it will be removed, as well. No take-backs, no do-overs. Are you sure?


In class today, we learn the basic knowledge about electric circuit----the OHM's Law which basically means the voltage across an conductor is directly propotionally to the current through it. We also learn the symbols for resistors, LEDs, switches, capacitors and the other things of the electric circuit.
Since I went to model UN on Friday, I missed the class of soldering. After I came back, Mr.Gerber gave me a electric circuit which is about the voice controlled LED light. If I solder every parts of the circuit right, the brightness of LEDs wwould change according to how loud my voice is. The metal I used for soldering is tin which is unbelievablly soft and malleable. I turned on the the soldering station first and it would heat up in a few seconds. Then I needed to use the pen-like part of the soldering station to melt the tin in order to solder things such as resistors and LEDs on the circuit. The soldering part is acutally really interesting. However, I soldered the integrated circuits on the cricult in a wrong way because I didn't know that the special integrated circuit is consisted of two parts. One of the inconvinience abotu soldering is that once you soldered, you can't really redo it. Next time I need to read the circuit diagram more carefully when I am doing circuit.
In the class, we needed to work on our Arduino IDE projects. There are 15 different circuits that we needed to finish in total.
We need to finish these arduino circuits according to the circuits diagram. Making such Arduino circuits is hard. For such circuits,
if I mess up a single wires or a single resistor, the whole circuit would not work. It's a painful process. Sometimes I really need
to ask for help from my friends near me or Mr.Gerber in order to really figure out what I did wrong. However, overall I enjoyed the
process of making these circuits because they gave me the sense of satisfaction.
Project 1:


The US Department of Veterans Affairs (the VA) developed an app called Mood Coach to help users with clinical depression. It is supposed to do so by implementing behavioral activation, which is based on the user choosing aspects of their lives they value and want to work on and then proceeding to add activities to help them work on these values on a weekly plan basis. Previously a mobile app team aimed at helping veterans with PTSD, the VA is now focused on becoming the world's leading provider of free mental health tools. The project was focused on solving Mood Coach's problem of low user engagement and usability.
Duration: 3 weeks
Team: 3 designers
User interviews, usability testing, design studios, paper prototyping, affinity mapping, sketching, hi-fidelity wireframes, concept mapping, feature prioritization
Although Mood Coach was created by clinical psychologists and is proven to help with depression, the app suffers from low user engagement and usability.
As stated by our client, the current problem was low user engagement and usability in Mood Coach. There were also some key constraints , such as inability to save/share user data, unique to Mood Coach since it is a government product. At first, this seemed to be a setback for our process because we had no information whatsoever about Mood Coach’s user at the beginning of the project. However, we learned that the app aimed at helping everyone with depression, so we had a beginning point for our research.
Design a platform that keeps users motivated through accountability, structure and community support to consequently help them live better lives.
We gathered from our research that motivation to complete mundane tasks was the toughest part about living with depression. We also learned that accountability was incredibly useful in providing motivation to complete these tasks.
Our research showed us that accountability can look like a lot of different things, such as external reminders, nudges, checklists, structure, and community support.
This finding led us to ideate multiple solutions that tied motivation and different types of accountability.
After gathering several conceptual solutions, we performed concept prioritization of the essential and low-effort implementations for Mood Coach, which led us to realize that some concepts of accountability are already implemented in Mood Coach. We had already learned that adding the notion of community support to Mood Coach would be essential to help users with motivation, but we had to understand why the current features of external reminders and structure were not engaging users before adding the concept of community support.
usability tests with users, we learned that confusion around the onboarding process, the values system, and plans in the current version of Mood Coach were responsible for low user engagement and usability. We used this data to validate the design decisions we made to improve Mood Coach's user engagement and usability.
Exploring the problem scope to discover user needs and apply a user-centered solution that would use accountability to motivate clinically depressed users.
Refining the Problem Scope
Even though our client, the VA, expressed that the user group for Mood Coach would be anyone and everyone living with depression, as UX designers we knew that having a clear and refined idea of who the user is is essential for an effective solution. Therefore, we explored the problem space of depression and those living with it by recruiting people with diagnosed depression for interviews. We validated that Mood Coach's users would be people with diagnosed depression, a belief in the power of self-help, and a desire to improve their current situation.
Data Analysis
Our interviews made clear that the commonalities between interviewees included difficulty staying motivated with mundane tasks and a strong desire for a nonjudgmental community. This guided our next set of interviews, which was geared toward understanding what helped people with depression stay motivated.
My team and I learned that accountability in the form of external reminders, nudges, community support, and structure helped them perform these mundane tasks. We immediately knew this would be the solution we had to implement.
Solutions + Mood Coach
We then proceeded to perform usability tests on Mood Coach with our target users and we grasped that the main issue with its usability was confusion revolving the onboarding process, the significance of values, setting up plans, and general functionality. At the same time, we learned that incorporating notifications and reminders in the app would allow for better user engagement since users would be prompted to return to the app and complete their plans.
We sketched out different forms that our solution could take and validated every design decision by going back to our users for usability tests and interviews. We found that the changes we implemented (streamlined onboarding, clarified plan set-up, and facilitated value-activity relationship) have indeed aligned with our users’ needs. By addressing our users’ needs, these feature changes made Mood Coach more engaging and useful to them.


- - - - HOURS - - - -
- Mon - Fri | 9AM - 8PM
- Saturday | 9AM - 7PM
- Sunday | 10AM - 6PM
In preparation for cold season shopping, all stores have been outfitted with Blueair air purifiers. We continue to limit the number of people in the stores at one time, sanitize our spaces regularly, wash our hands and observe social distancing. Please wear a mask at all times when shopping, whether in store or on our lot.
But the BIG news is that there are THREE DIFFERENT WAYS you can shop Mother Earth Gardens this season!
We look forward to seeing your eyeballs during this strange season, whether strolling through our lot, in our funky fun shop or for a hot second to pick up your online order!
Welcome to Mother Earth Gardens, a garden center that specializes in organic gardening, sustainably grown plants, and eco-friendly products.
Open year round, we have different specialties for each season. Throughout the spring and summer, we sell organic seeds, vegetables, and herbs as well as sustainably grown annuals and perennials. We feature the largest selection of native plants of any retail garden center in the Twin Cities.
During autumn, we sell a unique variety of locally grown gourds and pumpkins, along with locally grown branches and bunches, interesting flowering bulbs and numerous varieties of garlic for fall planting.
In the winter, we offer herbicide free Christmas trees, handmade swags, wreaths and centerpieces. We also sell unique gifts including locally made ceramics and jewelry.
Opening back up in mid January, we hit the ground running with an evolving variety of houseplants, succulents and creatively imagined containers to plant them in. Check our hours below and plan a visit!


WITNESS LIST Energy Resources Committee March 9, 2005-8:00A HB 773 Registering, but not testifying: For: Haynes, Adam (TIPRO) On: Mayorga, Jose (Railroad Commission of Texas) Tintera, John (Railroad Commission of Texas) Trevino, Rebecca (Railroad Commission of Texas) HB 1161 On: Fowler, Stacie (Railroad Commission of Texas) LaHood, Debbie (Railroad Commission of Texas) Registering, but not testifying: For: Hodges, Ken (Texas Farm Bureau) Stevens, Bill (Texas Alliance of Energy Producers) On: Seitz, Tommie (Texas Railroad Commission)


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----> Resize the Window to See the navigation bar collapse


The Bistro is open
NEW TEMPORARY TAKEOUT HOURS:
TUESDAY - SUNDAY
12 - 3PM,
4PM - 8PM
Closed Mondays,
Our Wine & Beer list is available!
Credit cards only please.
We will accept CC info via phone and bring your order curbside if you prefer.
For reservations call<PHONE_NUMBER>
We want to let our customers know that,
as a company, we have always maintained
a high sanitary environment. With that
said, we have increased sanitary best
practices even more. Employees are washing
their hands more, sanitizing our work space
constantly, and overall being vigilant about
cleanliness.We are confident in our preparation
and welcome you soon.
The Bistro handles Social Distancing
with a no contact - safe & friendly staff!
The Bistro is open
NEW TEMPORARY TAKEOUT HOURS:
TUESDAY - SUNDAY
12 - 3PM,
4PM - 8PM
Closed Mondays,
Our Wine & Beer list is available!
Credit cards only please.
We will accept CC info via phone and bring your order curbside if you prefer.
For reservations call<PHONE_NUMBER>
We want to let our customers know that,
as a company, we have always maintained
a high sanitary environment. With that
said, we have increased sanitary best
practices even more. Employees are washing
their hands more, sanitizing our work space
constantly, and overall being vigilant about
cleanliness.We are confident in our preparation
and welcome you soon.
The Bistro handles Social Distancing
with a no contact - safe & friendly staff!


%# Copyright 2006 University of Chicago %# %# Licensed under the UChicago-STAT Public License, (the "License"); %# you may not use this file except in compliance with the License. %# You may obtain a copy of the License in the "license.txt" file %# distributed with this Work, or download it at %# http://jcs.uchicago.edu/download/stat/license.txt %# %# Unless required by applicable law or agreed to in writing, software %# distributed under the License is distributed on an "AS IS" BASIS, %# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. %# See the License for the specific language governing permissions and %# limitations under the License. %# <%args> $path %args>
<% $m->comp("$path:help", path => $path, %ARGS) %> % if ( $path =~ /login/ ) { Back to Login Page % } else { Back to <% $m->comp("$path:page_title") %> % }


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Welcome to my landing page. You can see all of the work that I have done during Software Engineering class with Pogue during the fall semester of 2020. The work is grouped by sprints. Click in each link to see the small project.
My favorite Hobby
Syllabus
Dice Roll
RegExp
Node
New Landing Page
COMING SOON


by shiawuen
What I going to talk about are extracts from project I currently working on.
IT MIGHT NOT WORK FOR YOUR CASE.
When your page resize, elements will not stay at the same place where it should be.
Then you end up reposition your elements using JavaScript (ninja!), plus it don’t work well…
YES, you still have to use JavaScript to manually set width and height for some elements.
Yup, but this makes maintenance easier for me. =P
When size of elements on page depend on the width/height of the screen, you can easily have element position at correct position and same proportions without using JavaScript.
Changing the display-state on iOS is like adding or removing an element to and from the DOM and is therefor a very heady calculation depending on how many items you have in your DOM that can easyly cause the UI to freeze for a second or more.
iOS6 html hardware acceleration changes and how to fix them by Olaf
iOS6 html hardware acceleration changes and how to fix them by Olaf
fin.


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{% load staticfiles %}
{% csrf_token %}
Installed Apps
Install Custom Apps
{% include 'wapp_management/installed_apps_section.html' %} {% include 'wapp_management/custom_app_install_section.html' %}


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Check the included documentation file and start adding your components here. It's really simple.
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The Four Million
by O. Henry
"Memoirs of a Yellow Dog" The Four Million
Additional Information
- Year Published: 1906
- Language: English
- Country of Origin: United States of America
- Source: O. Henry, The Four Million (Doubleday, Page & Company; New York: 1906) Henry, O. (1906). The Four Million. Doubleday, Page & Company; New York.
 Mr. Kipling and a good many others have demonstrated the fact that animals can express themselves in remunerative English, and no magazine goes to press nowadays without an animal story in it, except the old–style monthlies that are still running pictures of Bryan and the Mont Pélee horror.
But you needn't look for any stuck–up literature in my piece, such as Bearoo, the bear, and Snakoo, the snake, and Tammanoo, the tiger, talk in the jungle books.
I was born a yellow pup; date, locality, pedigree and weight unknown.  Old Mother Hubbard was boosting me to beat the band as a genuine Pomeranian–Hambletonian–Red–Irish–Cochin–China–Stoke–Pogis fox terrier. The fat lady chased a V around among the samples of gros grain flannelette in her shopping bag till she cornered it, and gave up. From that moment I was a pet—a mamma's own wootsey squidlums. Say, gentle reader, did you ever have a 200–pound woman breathing a flavour of Camembert cheese and Peau d'Espagne pick you up and wallop her nose all over you, remarking all the time in an Emma Eames tone of voice: "Oh, oo's um oodlum, doodlum, woodlum, toodlum, bitsy–witsy skoodlums?"
From a pedigreed yellow pup I grew up to be an anonymous yellow cur looking like a cross between an Angora cat and a box of lemons. But my mistress never tumbled. She thought that the two primeval pups that Noah chased into the ark were but a collateral branch of my ancestors. It took two policemen to keep her from entering me at the Madison Square Garden for the Siberian bloodhound prize.
I'll tell you about that flat. The house was the ordinary thing in New York, paved with Parian marble in the entrance hall and cobblestones above the first floor. Our fiat was three—well, not flights—climbs up. My mistress rented it unfurnished, and put in the regular things—1903 antique unholstered parlour set, oil chromo of geishas in a Harlem tea house, rubber plant and husband.
By Sirius! there was a biped I felt sorry for. He was a little man with sandy hair and whiskers a good deal like mine. Henpecked?—well, toucans and flamingoes and pelicans all had their bills in him. He wiped the dishes and listened to my mistress tell about the cheap, ragged things the lady with the squirrel–skin coat on the second floor hung out on her line to dry. And every evening while she was getting supper she made him take me out on the end of a string for a walk.
If men knew how women pass the time when they are alone they'd never marry. Laura Lean Jibbey, peanut brittle, a little almond cream on the neck muscles, dishes unwashed, half an hour's talk with the iceman, reading a package of old letters, a couple of pickles and two bottles of malt extract, one hour peeking through a hole in the window shade into the flat across the air–shaft—that's about all there is to it. Twenty minutes before time for him to come home from work she straightens up the house, fixes her rat so it won't show, and gets out a lot of sewing for a ten–minute bluff.
I led a dog's life in that flat.  I slept sometimes and had pipe dreams about being out chasing cats into basements and growling at old ladies with black mittens, as a dog was intended to do. Then she would pounce upon me with a lot of that drivelling poodle palaver and kiss me on the nose—but what could I do?
I began to feel sorry for Hubby, dog my cats if I didn't. We looked so much alike that people noticed it when we went out; so we shook the streets that Morgan's cab drives down, and took to climbing the piles of last December's snow on the streets where cheap people live.
One evening when we were thus promenading, and I was trying to look like a prize St. Bernard, and the old man was trying to look like he wouldn't have murdered the first organ–grinder he heard play Mendelssohn's wedding–march, I looked up at him and said, in my way:
"What are you looking so sour about, you oakum trimmed lobster?  You don't have to sit on her lap and listen to talk that would make the book of a musical comedy sound like the maxims of Epictetus. You ought to be thankful you're not a dog. Brace up, Benedick, and bid the blues begone."
The matrimonial mishap looked down at me with almost canine intelligence in his face.
"Why, doggie," says he, "good doggie.  What is it, doggie—Cats?"
Cats! Could speak!
But, of course, he couldn't understand. Humans were denied the speech of animals. The only common ground of communication upon which dogs and men can get together is in fiction.
In the flat across the hall from us lived a lady with a black–and–tan terrier. Her husband strung it and took it out every evening, but he always came home cheerful and whistling. One day I touched noses with the black–and–tan in the hall, and I struck him for an elucidation.
"See, here, Wiggle–and–Skip," I says, "you know that it ain't the nature of a real man to play dry nurse to a dog in public. I never saw one leashed to a bow–wow yet that didn't look like he'd like to lick every other man that looked at him. But your boss comes in every day as perky and set up as an amateur prestidigitator doing the egg trick. How does he do it?
"Him?" says the black–and–tan. "Why, he uses Nature's Own Remedy. He gets spifflicated. At first when we go out he's as shy as the man on the steamer who would rather play pedro when they make 'em all jackpots.  I've lost two inches of my tail trying to sidestep those swinging doors."
The pointer I got from that terrier—vaudeville please copy—set me to thinking.
One evening about 6 o'clock my mistress ordered him to get busy and do the ozone act for Lovey. I have concealed it until now, but that is what she called me. The black–and–tan was called "Tweetness." I consider that I have the bulge on him as far as you could chase a rabbit. Still "Lovey" is something of a nomenclatural tin can on the tail of one's self respect.
 I made a dead–ahead scramble for the doors, whining like a dog in the press despatches that lets the family know that little Alice is bogged while gathering lilies in the brook.
 Lemme see—how long's it been since I saved shoe leather by keeping one foot on the foot–rest? I believe I'll—"
I knew I had him. Hot Scotches he took, sitting at a table. For an hour he kept the Campbells coming. I sat by his side rapping for the waiter with my tail, and eating free lunch such as mamma in her flat never equalled with her homemade truck bought at a delicatessen store eight minutes before papa comes home.
When the products of Scotland were all exhausted except the rye bread the old man unwound me from the table leg and played me outside like a fisherman plays a salmon. Out there he took off my collar and threw it into the street.
"Poor doggie," says he; "good doggie.  'S a darned shame.
I refused to leave. I leaped and frisked around the old man's legs happy as a pug on a rug.
"You old flea–headed woodchuck–chaser," I said to him—"you moon–baying, rabbit–pointing, egg–stealing old beagle, can't you see that I don't want to leave you?  Why not cut that all out and be pards forever more?"
Maybe you'll say he didn't understand—maybe he didn't. But he kind of got a grip on the Hot Scotches, and stood still for a minute, thinking.
"Doggie," says he, finally, "we don't live more than a dozen lives on this earth, and very few of us live to be more than 300. If I ever see that flat any more I'm a flat, and if you do you're flatter; and that's no flattery. I'm offering 60 to 1 that Westward Ho wins out by the length of a dachshund."
There was no string, but I frolicked along with my master to the Twenty–third street ferry. And the cats on the route saw reason to give thanks that prehensile claws had been given them.
On the Jersey side my master said to a stranger who stood eating a currant bun:
"Me and my doggie, we are bound for the Rocky Mountains."
But what pleased me most was when my old man pulled both of my ears until I howled, and said:
"You common, monkey–headed, rat–tailed, sulphur–coloured son of a door mat, do you know what I'm going to call you?"
I thought of "Lovey," and I whined dolefully.
"I'm going to call you 'Pete,'" says my master; and if I'd had five tails I couldn't have done enough wagging to do justice to the occasion.


{% load static %} {% include 'head.html' %}
PawPrints is taking a nap.
In the meantime check out
naps.rit.edu
.


Greece
Arachne
In a small town of Ledia, in Northern Greece, there once lived a beautiful maid with the name Arachne. Arachne was famous in town for being a very skillful weaver and spinner and every day many girls and nymphs were stopping by to see her weave. However, Arachne was a very vain girl and couldn’t stop boasting about her talent. She claimed that she had learned the skill all by herself and that there was no one else in the world who could weave as delicately as her... she even felt that she could compete against Athena, the goddess of skill, and win her with ease. When Athena heard these words, she got disappointed and decided to disguise as an old lady and appear in front of Arachne. "My dear", she told Arachne, "I am old and have much experience from life, so let me give you one advice: don’t ever mess up with a goddess! No mortal can compete against Athena. Take back your words and kindly ask for forgiveness..." Arachne got furious and threw the thread against the old woman, telling her: "I don’t need your advice, I know best what I can do! If Athena really dares, then she should come here and compete against me!" At that moment, the old woman transformed herself into the radiant goddess Athena. On her sight, everybody in the room kneeled down in awe... not so Arachne, who couldn't wait to compete against her. Soon the competition started and both contestants were doing really well. Athena was weaving the Parthenon and her contest with god Poseidon. Arachne, on the other hand, was making fun of the gods by weaving scenes of gods full of weaknesses and fears. Arachne’s work seemed to be perfect technically, yet it was not beautiful because it was showing disregard of the gods. When she saw this, Athena became very offended and told Arachne: "You may be foolish and stubborn, but you seem to love your work. So why don’t you go ahead and spin forever!" Immediately, Athena sprinkled her with the juice of magical herbs and the body of Arachne transformed into a small and ugly animal, which nowadays is known as the spider.
Source: Here


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This tutorial will bring to bear tools from economics and computer science on a core problem of social good: provision of goods to vulnerable populations. By definition, forms of vulnerability such as poverty preclude access to goods through normal market channels. Without intervention, this can be ruinous individually and greatly suboptimal socially. Universal provision is one often-touted solution, but can be costly and inefficient. Consequently, more targeted approaches are common, but must contend with lack of priors about the population of interest. We survey the rich mechanism design and machine learning questions inherent in the most prevalent approaches to this unique resource allocation problem and suggest directions for future work from the EC community.
Topics:
- Session 1A: Introduction. Targeting Toolbox. Proxy Means Testing. Community-Based Targeting. [Video, Slides]
- Session 1B: Self-targeting. Ordeal-based targeting. In-kind provision. [Video, Slides]
- Session 2A: Consequences of behavioral theories. [Video, Slides]
- Session 2B: Algorithmic issues in information acquisition. Strategic classification. Bayesian learning in networks. [Video, Slides]
Logistics
Target Audience
The tutorial will be self-contained, and designed for students and researchers in computer science and economics without assuming previous knowledge of public / social service provision. It will emphasize applications of tools from machine learning and mechanism design in promoting social good. The audience will be exposed to potentially new models from economics and theoretical computer science which capture key issues in provision. The discussion of empirical work will illustrate the complexities of practical implementation, highlight the importance of experimentation to understanding relevant factors for vulnerable populations in particular, and suggest potential for further theoretical work.
Schedule
Pre-recording will take place over the course of two days.- Session 1: Thursday June 25, 11-11:45am and 12-12:45pm Eastern
- Exercise Session: Thursday June 25, 3-4pm Eastern
- Session 2: Friday June 26, 11-11:45am and 12-12:45pm Eastern
Registration
You have to register for the ACM EC Conference to participate in this tutorial. Please register here. Note, registration is free with a SIGecom membership ($5 for students and $10 for others).References
Session 1A:
- Adams, Alayne M., Timothy G. Evans, Rafi Mohammed, and Jennifer Farnsworth. "Socioeconomic stratification by wealth ranking: Is it valid?." World Development (1997)
- Alatas, Vivi, Ririn Purnamasari, Matthew Wai-Poi, Abhijit Banerjee, Benjamin A. Olken, and Rema Hanna. "Self-targeting: Evidence from a field experiment in Indonesia." Journal of Political Economy (2016)
- Alatas, Vivi, Abhijit Banerjee, Rema Hanna, Benjamin A. Olken, and Julia Tobias. "Targeting the poor: evidence from a field experiment in Indonesia." American Economic Review (2012)
- Alderman, Harold. "Do local officials know something we don't? Decentralization of targeted transfers in Albania." Journal of Public Economics (2002)
- Currie, Janet, and Firouz Gahvari, "Transfers in cash and in-kind: Theory meets the data." Journal of Economic Literature (2008)
- Dworczak, Piotr, Scott Duke Kominers, and Mohammad Akbarpour. "Redistribution through Markets." EC (2018)
- Hanna, Rema, and Benjamin A. Olken. "Universal basic incomes versus targeted transfers: Anti-poverty programs in developing countries." Journal of Economic Perspectives (2018)
- Karlan, Dean, and Bram Thuysbaert. "Targeting ultra-poor households in Honduras and Peru." The World Bank Economic Review (2019)
Session 1B:
- Alatas, Vivi, Ririn Purnamasari, Matthew Wai-Poi, Abhijit Banerjee, Benjamin A. Olken, and Rema Hanna. "Self-targeting: Evidence from a field experiment in Indonesia." Journal of Political Economy (2016)
- Kleven, Henrik Jacobsen, and Wojciech Kopczuk. "Transfer program complexity and the take-up of social benefits." American Economic Journal: Economic Policy (2011)
- Mkandawire, Thandika. "Targeting and universalism in poverty reduction." United Nations Research Institute for Social Development. (2005)
Session 2A:
- Bhargava, Saurabh, and Dayanand Manoli. "Psychological frictions and the incomplete take-up of social benefits: Evidence from an IRS field experiment." American Economic Review (2015)
- Carvalho, Leandro S., Stephan Meier, and Stephanie W. Wang. "Poverty and economic decision-making: Evidence from changes in financial resources at payday." American Economic Review (2016)
- Dohmen, Thomas, Armin Falk, David Huffman, Uwe Sunde, J�rgen Schupp, and Gert G. Wagner. "Individual risk attitudes: Measurement, determinants, and behavioral consequences." Journal of the European Economic Association (2011)
- Falk, Armin, Anke Becker, Thomas Dohmen, Benjamin Enke, David Huffman, and Uwe Sunde. "Global evidence on economic preferences." The Quarterly Journal of Economics (2018)
- Fong, Christina M., and Felix Oberholzer-Gee. "Truth in giving: Experimental evidence on the welfare effects of informed giving to the poor." Journal of Public Economics (2011)
- Haushofer, Johannes, Daniel Schunk, and Ernst Fehr. "Negative income shocks increase discount rates." Working paper. (2019)
- Incekara-Hafalir, Elif, and Sera Linardi. "Awareness of low self-control: Theory and evidence from a homeless shelter." Journal of Economic Psychology (2017).
- Linardi, Sera, and Nita Rudra. "Globalization and Willingness to Support the Poor in Developing Countries: An Experiment in India." Comparative Political Studies (2020)
- Mani, Anandi, Sendhil Mullainathan, Eldar Shafir, and Jiaying Zhao. "Poverty impedes cognitive function." Science (2013)
- Madrian, Brigitte C., and Dennis F. Shea. "The power of suggestion: Inertia in 401 (k) participation and savings behavior." The Quarterly Journal of Economics (2001)
- Petersen, Michael Bang, Daniel Sznycer, Leda Cosmides, and John Tooby. "Who deserves help? Evolutionary psychology, social emotions, and public opinion about welfare." Political Psychology (2012)
- Tanaka, Tomomi, Colin F. Camerer, and Quang Nguyen. "Risk and time preferences: Linking experimental and household survey data from Vietnam." American Economic Review (2010)
Session 2B:
- Alatas, Vivi, Abhijit Banerjee, Arun G. Chandrasekhar, Rema Hanna, and Benjamin A. Olken. "Network structure and the aggregation of information: Theory and evidence from Indonesia." American Economic Review (2016).
- Alatas, Vivi, Abhijit Banerjee, Rema Hanna, Benjamin A. Olken, and Julia Tobias. "Targeting the poor: evidence from a field experiment in Indonesia." American Economic Review (2012)
- Blundell, Richard, and Hilary W. Hoynes. "Has' In-Work' Benefit Reform Helped the Labor Market?" In Seeking a Premier Economy: The Economic Effects of British Economic Reforms, 1980-2000, University of Chicago Press (2004).
- Friedberg, Leora. "The labor supply effects of the social security earnings test." Review of Economics and Statistics (2000)
- Hardt, Moritz, Nimrod Megiddo, Christos Papadimitriou, and Mary Wootters. "Strategic classification." ITCS (2016).
- Hu, Lily, Nicole Immorlica, and Jennifer Wortman Vaughan. "The disparate effects of strategic manipulation." FAT* (2019)
- Maestas, Nicole, Kathleen J. Mullen, and Alexander Strand. "Does disability insurance receipt discourage work? Using examiner assignment to estimate causal effects of SSDI receipt." American Economic Review (2013)
- Milli, Smitha, John Miller, Anca D. Dragan, and Moritz Hardt. "The social cost of strategic classification." FAT* (2019).
Organizers
Sera Linardi, University of Pittsburgh
Sera Linardi is an experimental economist and an associate professor of Economics at Graduate School of Public and International Affairs at the University of Pittsburgh. She holds a PhD in Social Science from California Institute of Technology and is the founding director of Center for Analytical Approaches to Social Innovation (CAASI), which builds interdisciplinary research teams to work on practical problems faced by organizations. She is a co-organizer of the 2020 NSF/CEME Decentralization conference on Mechanism Design for Vulnerable Populations. Her research focuses on the two ends of service provision: donor altruism and client utilization, with field experiments on homelessness and reintegration services. She is currently funded by the NSF, Heinz Foundation, Rapoport Foundation, and the Integrative Social Science Research Initiative.
Email<EMAIL_ADDRESS>Sam Taggart, Oberlin College
Sam Taggart is assistant professor of computer science at Oberlin College. He is co-organizer of the Mechanism Design for Social Good working group on inequality. His research interests lie at the intersection of theoretical computer science and microeconomic theory. Specific interests include applications of tools from mechanism design, statistical learning, and theoretical computer science to problems of social import, the interaction between economic incentives and statistical learning and in obtaining theoretical performance guarantees for practical resource allocation protocols such as the first-price auction. He holds a PhD in Computer Science from Northwestern University.
Email<EMAIL_ADDRESS>Support: Rediet Abebe, Irene Lo, and Ana-Andreea Stoica


Introduction to Computer Science (Udacity) , CS50 (Harvard Univeristy), Introduction to interactive programming in Python (Rice University), Programming Foundations with JavaScript, HTML and CSS (Duke University), Algorithms Part 1 (Princeton University), Building Web Applications in PHP (University of Michigan)


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Utility
Utility functions / methods.
- fw.start() - Start Footwork / initialize application
- fw.guid() - Generate a random GUID.
fw.start()
fw.start( targetElement )
Initialize / start Footwork (optionally on the specified node/element):
// start application (defaults to body element)
fw.start();
// start application on #appContainer element
fw.start(document.getElementById('appContainer'));
NOTE: This is very similar to calling ko.applyBindings(). In fact they are identical except
fw.start() is a simplified version which does not accept a viewModel to bind, it simply causes Footwork
to begin binding (and thus it will initialize any viewModel/router/component/etc definitions it finds in the markup). ko.applyBindings()
does the same, but also requires that you supply a viewModel to bind.
fw.guid()
Generate a random GUID (format: ########-####-####-####-############):
// generate a random GUID
var guid = fw.guid();
// guid === "629e4dfa-fd39-d756-b830-563af555a03f"


Decide where your cloud lives. Maybe he lives right in here. We'll paint one happy little tree right here. The only thing worse than yellow snow is green snow. It's so important to do something every day that will make you happy.
See there how easy that is. Let's make some happy little clouds in our world. Let's do that again.
We spend so much of our life looking - but never seeing. Van Dyke Brown is a very nice brown, it's almost like a chocolate brown. Mix your color marbly don't mix it dead. You can't make a mistake. Anything that happens you can learn to use - and make something beautiful out of it.
Don't fight it, use what happens. We're trying to teach you a technique here and how to use it. We artists are a different breed of people. We're a happy bunch.
Look around, look at what we have. Beauty is everywhere, you only have to look to see it. Let's put some happy little clouds in our world. Don't hurry. Take your time and enjoy. Isn't it fantastic that you can change your mind and create all these happy things?
 Everyone needs a friend. Friends are the most valuable things in the world. I'll go over the colors one more time that we use: Titanium white, Thalo green, Prussian blue, Van Dyke brown, Alizarin crimson, Sap green, Cad yellow, and Permanent red. Put your feelings into it, your heart, it's your world. You can get away with a lot.


I am a Smith College alumna with a BA in Studio Art and minor in Computer Science. I am passionate about work that intersects art and technology and enjoy finding creative solutions to problems. Previously, I have worked as a graphic/web designer for a variety of projects. My work in web design eventually sparked in interest in development and has led to my current pursuit of becoming a web developer.
I have experience building websites and applications using both front and back-end technologies.
I enjoy creating aesthetic designs and delivering great user experiences.
I have a knack for design and am experienced with using the Adobe Creative Suite.
I utilize Github and Git to develop and keep track of projects


api_shim.core.buffer.Buffer:
A Buffer represents a sequence of zero or more bytes that can be
written to or read from, and which expands as necessary to
accomodate any bytes written to it.
api_shim.core.streams.Pump:
Pumps data from a ReadStream to a WriteStream and performs flow
control where necessary to prevent the write stream from getting
overloaded.
api_shim.core.parsetools.RecordParser:
A helper class which allows you to easily parse protocols which are
delimited by a sequence of bytes, or fixed size records.
api_shim.core.http.RouteMatcher:
This class allows you to do route requests based on the HTTP verb
and the request URI, in a manner similar to Sinatra or
Express.
api_shim.core.shared_data.SharedData:
Sometimes it is desirable to share immutable data between different
event loops, for example to implement a cache of data.
api_shim.core.http.HttpClientRequest:
Instances of this class are created by an HttpClient instance, via
one of the methods corresponding to the specific HTTP methods, or
the generic HttpClient request method.


Reports any class which:
- doesn't depend on any other class in its package
- is not a dependency for any other class in its package
Such classes are an indication of ad-hoc or incoherent packaging strategies,
and may often profitably be moved.
Because this inspection requires global code analysis it is only available for Analyze|Inspect Code or
Analyze|Run Inspection by Name and it will not report in the editor.


China plans stronger protections for intellectual property rights
SHANGHAI: China said on Sunday it would seek to improve protections for intellectual property rights, including raising the upper limits for compensation for rights infringements.
An opinion document released by the State Council and Communist Party's Central Office on Sunday evening called for a strengthening of protections through both the civil and criminal justice systems and an effective enforcement of penalties.
The upper limits on legal compensation should be raised substantially, it said.
The document said that by 2022, China should be making progress in issues that have affected intellectual property rights enforcement, such as low compensation, high costs, and the difficulty of proof. By 2025, there should be a better system of protection in place.
(Reporting by Alexandra Harney; Editing by Mark Potter)


Working around AutoCAD quirks using AutoCAD quirks.
I got pulled away from the project I was working on today to try and automate around a CAD content problem. At work we have three simultaneous projects with the same client. They, because of their internal politics, are doing all the civil survey work in-house. They do try, and they are willing to work with us when their product is unsatisfactory, but we've gotten a lot of odd and broken data from them.
In this particular case we received a file containing additional right-of-way and property ownership information. Since the surveyors prepared the file with only their own drawings in mind (as they usually do) all the text and line-work were tweaked and manually overridden. In particular the property tags and owner information were placed at a size and orientation that fit the survey plans, but not ours.
After getting go ahead to fix the issue my boss came and asked if I could help out. His plan was to somehow adjust the text and then make it annotative, which just means it can be sized/oriented differently in different views. We talked about it and played around with some solutions and decided on fixing and decorating the text and then turning everything into an annotative block. Annotative blocks allow arbitrary collections of geometry to be automatically sized and rotated.
I only had an hour to bang something together, and although I ran into some problems, I ended up with something that worked and was even relatively nice to use. Since it is short here is all the code, I'll break down some of the what and why next:
File saved at "d:\pown_wrap.scr"
;; Preamble
(defun c:pown_block ( / dummy)
(setq title (car (entsel "Select title text"))
name (cdr (assoc 1 (entget title)))
dummy (princ "\n")
note (car (entsel "Select note text")))
(command "script" "d:\\pown_wrap.scr")
(princ))
;; Conditional break
(if (not title) (command "invalid"))
;; Modifications (note: bg is a custom lisp command)
select !note ;
justifytext p ;
tc;
bg p ;
select !title ;
justifytext p ;
mc;
bg p ;
(setq insert (cdr (assoc 10 (entget title))))
;; Express tools Lisp command
select !title ;
tcircle p ;
slots
;; Block creation and re-insertion
-block !name annotative yes yes !insert l !title !note ;
;; The insert command tried to interpret `!name` as a file path...
(command "-insert" name insert "1" "" "0")
;; Clean up
(setq title nil note nil name nil insert nil)
Above is an AutoCAD script file. All the white-space is significant, especially at the end of lines. I went with a script instead of just writing the whole thing in lisp because AutoCAD's lisp interpreter has an odd restriction: it is prevented from executing any command that requires use of the interpreter. This means AutoLisp cannot automate a command that is written in AutoLisp.
In this case I want to use my own bg
command (which turns on text masking),
and a built-in command tcircle
which wraps text in decorative shapes. The only
way I can run those commands without user mediation is in a script, but scripts
must be a file on disk, and they don't allow any user interaction. So I still
need the user to run a lisp command so I can gather their input to use in the
script...
;; Preamble
(defun c:pown_block ( / dummy)
(setq title (car (entsel "Select title text"))
name (cdr (assoc 1 (entget title)))
dummy (princ "\n")
note (car (entsel "Select note text")))
(command "script" "d:\\pown_wrap.scr")
(princ))
The preamble actually defines the lisp command used to collect property titles
and ownership notes. In AutoLisp a function prepended by c:
becomes an AutoCAD
command. Since no AutoCAD command starts with pow
those three letters
auto-complete to this command. After collecting the DB entities the command then
runs the same script file it is defined in...
;; Conditional break
(if (not title) (command "invalid"))
The conditional break
line is a neat hack. There is no way to conditionally
terminate script execution in AutoCAD, but it does terminate automatically when
an invalid command is executed, which "invalid" is.
So when the user drags the script into the application window the pown_block
command is defined, and if the lisp var title
is not defined then execution
stops. The user then runs the pow
command which initializes title
and
executes the same script, which is now able to reach the "Modifications" section.
;; Modifications (note: bg is a custom lisp command)
select !note ;
justifytext p ;
tc;
bg p ;
select !title ;
justifytext p ;
mc;
bg p ;
(setq insert (cdr (assoc 10 (entget title))))
;; Express tools Lisp command
select !title ;
tcircle p ;
slots
;; Block creation and re-insertion
-block !name annotative yes yes !insert l !title !note ;
;; The insert command tried to interpret `!name` as a file path...
(command "-insert" name insert "1" "" "0")
From there everything is pretty standard. Note that I cannot use the !var
syntax to access lisp variables, again because of the re-entrance restriction.
Fortunately Autodesk fixed a bug in earlier versions of the select command so
it can now make selections! All the trailing p
s are shorthand for previous
selection (since those commands clear the active selection for some reason).
I actually wait to grab the title's coordinate until after changing the justification to middle center, so the block insertion point is nicely centered. Once the block is made I clear all the vars in case the lisp has to be manually redefined.
Now instead of a 20+ steps to convert each set of annotation you can just type
pow
and pick a couple of pieces of text!
Autodesk, and AutoCAD are registered trademarks or trademarks of Autodesk,
Inc., and/or its subsidiaries and/or affiliates in the USA and/or other
countries.
I have no affiliation with them except the use of their products.


These release notes cover new developer and user-facing incompatibilities, important issues, features, and major improvements.
A new flag is added for Canary tool: -treatFailureAsError When this flag is specified, read / write failure would result in Canary tool exit code of 5.
Fixed an issue in REST server checkAndPut operation where the remaining cells other than the to-be-checked column are also applied in the put operation .
This patch fixes some issues when MetaCache (region location cache) gets unnecessarily dropped on the client.
On master branch we now in RegionServerCallable and RegionServerAdminCallable pass the actual exception down to Connection#updateCachedLocation, so we could check there if the exception is "meta-clearing" or not.
on branch-1, branch-1.2 and branch 1.3 we now check if the exception is meta-clearing or not in AsyncProcess (this check was there on master, but not on earlier branches)
Fixed an issue in REST server checkAndDelete operation where the remaining cells other than the to-be-checked column are also applied in the Delete operation. Also fixed an issue in RemoteHTable where the Delete object was not passed correctly to the REST server side.
Failed taking snapshot - Manifest proto-message too large. add property ("snapshot.manifest.size.limit") to change max size of proto-message
WARNING: No release note provided for this change.
This fix decreases client's memory allocation during writes by more than 50%.
HBASE-14256 Correct confusing flush task message


Discover new art. Be Discovered.
Join a community of people who take art as seriously as you do.
join artful...the world of high art. Develop a collection of your favorites. Create a gallery based on a theme. Find new work by up-and-coming artists based on what you know and love. Strike out in an unexpected direction and find yourself somewhere new. All of this and more is waiting for you at artful .
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--- layout: page title: Lean Prover Zulip Chat Archive permalink: archive/113489newmembers/34800remember.html ---
Is there something similar to coq's remember tactic in lean?
I can't find it in lean's documents
What does coq's remember tactic do?
It's basically a way to remember a term so that after pattern matching on a non-trivial term, no information is lost
Possibly generalize
. But I don't fully understand the explanation in the coq docs
I think cases
and/or induction
accepts a syntax which lets you name a hypothesis that the thing you pattern matched is equal to the result of the pattern match--is that the sort of thing you mean?
yes
that's what I want
Yes, they both have it: the syntax is cases (id :)? expr (with id*)?
--check the docstring for full details
Thanks!
{% endraw %}


The purpose of this group is to teach guys the how to meet and date the women that they like. By doing so, guys learn how to become a better man... by living the kind of life that they love.
MMG creates better lives through positivity. It's about releasing negative judgments about ourselves, about others, so that deeper connections and deeper experiences can be made.
The group is focused on real-world experiences and not mental busy-work. The day-to-day homework is about having experiences with women. Consuming pick-up media is not the focus of this group.
Another goal of the group is to let guys become the guy who they have always wanted to be. It's about making the changes in the daily life that align with all the little day-dreams of what would be cool to have, be, or do. We want to make the exceptional normal. Turning dreams in to day-to-day life is the heart of this organization.
MMG is about having a complete and full life! This is not a "fake it 'til to you make it" organization. We want people to live a real life that is empowering... To them and those around them. We beleive there is a wholesome aspect to being a badass that has time for his family, friends, and spirituality. We are the type of people that want to contribute a deep and meaningful change to this world without having to win awards for it.
We value the relationships in our lives. Even as people grow and change, we have the leadership and communication skills to grow with them. We value the intimacy and openness that lead to amazing family relationships. Most of all, we know how to have fun with the people in our lives.
For beginners we provide the framework, atmosphere, knowledge, and planned experiences, that will allow guys to be comfortable meeting and dating women. For intermediate guys, we provide a clear structure for you to work within that most never really understand. We also drill on the basics in a way that we've found to create a significant improvement in results.
We are volunteers and a registered 501(c)(3) non-profit. We've created this group to give back to the community that has given us so much. We feel that teaching other men is an important step in our own development.
Examples of what will be covered:
"It's a great program. No magic formula. A lot of learning by doing. Coaches are all non-profit and teaching because they want to give back. Incredible sense of community and team spirit. And the whole process is a 12 week journey at the end of which I actually learned what I was set out to learn, and even more. Keep it up" - Bulgar the Dimovian
"In a world where most "pick up" products and people are marketing artists of bullshit, MMG is like winning the lottery. A ton of guys with amazing skills, uplifting attitudes, and powerful dedication to sharing them. Tiny teacher-to-student ratios for maximum guidance. Getting in on this is getting in to a club, building killer friendships on a journey to a sexually-fulfilling lifestyle. Hands down the most excellent way to gain these skills I've ever found. THIS. IS. IT." -Seth
"Within a year my life went from being just average with women to the most incredible kick-ass, sex-filled, exciting adventure of my life. My favorite part about it all is that the guys are really cool, so it make it really easy to learn everything and get used to my new lifestyle. They're totally supportive, positive people who want to see you succeed. Finding this group is the second best thing that's happened to me all year.. the first is meeting the giorl of my dreams ;) " -The Awesome Man
"(Modern Man's Guide) has been an incredible journey so far both for the wingman meetups and the workshops that are offered. I have learned a lot about improving my game through the workshops, and I've made great strides while meeting good friends. I used to organize a Meetup group to find cool winmen, but I shut it down once I discovered (MMG). It's that good!" -DoubleD
Feel free to email to receive additional information or the date of the next program, or to just say hey!


@* * Copyright 2020 HM Revenue & Customs * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. *@ @import helper.CSRF @import testOnly.models.FeatureSwitchModel @import testOnly.views.html.singleCheckbox @import common.ConfigKeys @(form: Form[FeatureSwitchModel])(implicit request: Request[_], messages: Messages, appConfig: config.AppConfig) @views.html.main_template(title = "Feature switches", bodyClasses = None, appConfig = appConfig) { @helper.form(action = testOnly.controllers.routes.FeatureSwitchController.submitFeatureSwitch) { @CSRF.formField


You need spaces around the comparison operator.
[[ 0=1 ]]
[[ 0 = 1 ]]
[[ 0 = 1 ]]
means "check if 0 and 1 are equal".
[[ str ]]
is short form for [[ -n str ]]
, and means "check if str
is non-empty". It doesn't matter if str
happens to contain 0=1
.
Always use spaces around the comparison operator in [..]
and [[..]]
, otherwise it won't be recognized as an operator.
None.


Pham Huy Thong
@phamhuythong 3 months, 2 weeks ago
Pham Huy Thong commented on the post, Beautiful Image Post, on collection Hanoi Grapevine
3 months, 2 weeks ago
Quis autem vel eum iure reprehenderit qui in ea voluptate velit esse quam nihil molestiae consequatur!!!
Pham Huy Thong posted an update
3 months, 1 weeks ago
Finally I am almost done with Gone and can go Hanoi Grapevine Selection now!
Total 4 Friends
Sorry, I don't have any collections at this moment.
Pham Huy Thong attended event Grapevine Collections
3 months, 2 weeks ago
Quis autem vel eum iure reprehenderit qui in ea voluptate velit esse quam nihil molestiae consequatur!!!
Pham Huy Thong joined on the exhibition Galerie Artitude. Paris.
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salescritter
`Prev `__
S
`Next `__
--------------
**salescritter**: /sayls´kri\`tr/, n.
Pejorative hackerism for a computer salesperson. Hackers tell the
following joke:
|
| Q. What's the difference between a used-car dealer and a
| computer salesman?
| A. The used-car dealer knows he's lying. [Some versions add:
| ...and probably knows how to drive.]
This reflects the widespread hacker belief that salescritters are
self-selected for stupidity (after all, if they had brains and the
inclination to use them, they'd be in programming). The terms salesthing
and salesdroid are also common. Compare
`*marketroid* <../M/marketroid.html>`__, `*suit* `__,
`*droid* <../D/droid.html>`__.
--------------
+-------------------------+----------------------------+-------------------------+
| `Prev `__ | `Up <../S.html>`__ | `Next `__ |
+-------------------------+----------------------------+-------------------------+
| SAIL | `Home <../index.html>`__ | salt |
+-------------------------+----------------------------+-------------------------+


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AllTests
Number of tests: 6 [time is: 2021-03-24T01:54:45]
Passed: 6
Failed: 0
Disabled: 0
run_test_iotoio
run_test_buffpacket
run_test_iotoio
Show All
Show Only Passed
Show Only Failed
Show Only Disabled
Number of tests: 1
Passed: 1
Failed: 0
Disabled: 0
test_iotoio
Time: 0
run_test_buffpacket
Show All
Show Only Passed
Show Only Failed
Show Only Disabled
Number of tests: 5
Passed: 5
Failed: 0
Disabled: 0
test_buffpacket_number
Time: 0
test_buffpacket_string
Time: 0
test_buffpacket_offset
Time: 0
test_buffpacket_net_order
Time: 0
test_buffpacket_read_write
Time: 0


Someone really smart once said design is art with purpose. I’ve always taken that to heart and design with the intention to create solutions within constraints.
Crafting for a better web, the focus is uniting a clear message with an aesthetically pleasing, smart design to create a delightful user experience.
With the starting focus on the user, product design should compliment the task at hand and be intuitive, easy to use, unobtrusive and beautiful.
Branding isn’t just an awesome mark, it’s a customized visual system for digital and print collateral - an identity consistent across all platforms.
As an intuitive visual representation, icons and illustrations should clearly communicate a message in a prepossessing way across a variety of scale and medium.
Designing for Mobile.


Objective
I am a student in a web development program, where I am learning HTML, CSS and Javascript. Following completion of this program, I hope to obtain a job that will allow me to continue to build upon my technical skills.
I am a student in a web development program, where I am learning HTML, CSS and Javascript. Following completion of this program, I hope to obtain a job that will allow me to continue to build upon my technical skills.
Southwestern University, B.A. in Psychology


Net.LocalAddress
Syntax
Net.LocalAddress : string
Description
Returns the TCP/IP numeric address of the machine the program is running on. The numeric address is of the form xxx.yyy.zzz.www where each segment is a number from 0 to 255.
Details
The Net module requires a TCP/IP stack to be installed and operating in order to function. It does not communicate using any other protocols
It is possible for Firewalls to interfere with the actions of the Net module, preventing connections from taking place.
Example
The following program prints out the TCP/IP numeric address of the current machine.
put "Your machine address is ", Net.LocalAddress
Status
Exported qualified.
This means that you can only call the function by calling Net.LocalAddress, not by calling LocalAddress.
See also
Net.LocalName.


The page you are looking for might have been removed had changed or is temporarily unavailable
© Ingenium Interiors


I use the latest technology for human and machine translation, coupled with nearly 20 years of Mandarin Chinese language experience.
A concept from the world of coding, I focus on making tranlations understandable for the audience.
In addition to language translation, I'm also a website and application developer, thus can easily integrate text, audio, and visual translations to meet today's tech needs.
I've appeared on Chinese national tv programs 4 times and have helped tons and tons of people translate and interpret from both English and Chinese, and Chinese to English. It's not just about the words -- I bridge culture and meaning.


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{% with error=details_form.default_authors.errors %}
{{ details_form.default_authors }}
{% endwith %}
{% if book.details and book.details.goodreads_id %}
{% else %}
{% endif %}
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{{ details_form.end_date }}


pyblake2 is an extension module for Python implementing BLAKE2 hash function.
BLAKE2 is a cryptographic hash function, which offers highest security while being as fast as MD5 or SHA-1, and comes in two flavors:
BLAKE2 supports keyed mode (a faster and simpler replacement for HMAC), salted hashing, personalization, and tree hashing.
Hash objects from this module follow the API of standard library’s hashlib objects.
Contents:


On to the Next Level: Continuing the Conceptualization of the Bricolage
Authors
Joe L. Kincheloe
Year
Notes
Tags
Relevance
Quotations
Boundary Objects
Concepts
Field of Study
Methodology
References


Overview:
The LabVIEW Call LV.Call("module_name", "command", data) function is the primary method of calling back from Lua to LabVIEW. This allows the developer to utilize LabVIEW side functionality inside of Lua scripts. To make the interface as simple and intuitive as possible the decision was made to bundle exposed LabVIEW code into 'modules'.
These modules receive a string command and data in the form of a LabVIEW variant. A module also has the option of returning variant data back to the calling Lua script. MLua has data translation routines that convert types between the two programming languages. This not only makes development easier, but also safer - as there is no risk of corrupting Lua or LabVIEW's memory space by invalid data conversions.
LabVIEW MLua module block diagram
In the example above it can be seen that a MLua module is a LabVIEW VI. These modules get added to MLua at run time with the Install Module and Register Module VIs. They get accessed from within Lua using the LV.Call function.
Usage:
There are three variants of the LV.Call function, the number of arguments determine how the function will behave.
1.Full version:
LV.Call("module_name", "command", data)
With three arguments a complete or full LV.Call is preformed. The first argument specifies the module which must perform the call, the second is the string command. The third argument is the Lua data to convert and send to the module for processing. If a command is to be sent to a specific module without any associated data, then the data argument must be set to 'nil' to keep the argument count at three.
example:
-- send string data to the test module with a command to convert to uppercase
res = LV.Call("test", "return_uppercase", "hallo world")
return res
-- send command to the test module, data set to nil
res = LV.Call("test", "return_status", nil)
return res
2. Default module:
LV.Call("command", data)
With two arguments a LabVIEW call is made to the current default module. The first argument is the string command, the second is the Lua data to convert and send to the module for processing.
example:
res = LV.Call("return_uppercase", "hallo world")
return res
3. Command to default module:
LV.Call("command")
With a single argument a LabVIEW call is made to the default module with no additional arguments.
example:
res = LV.Call("hallo world")
return res


Size:
×
Depth:
Background color:
Branch color:
Branch length (px):
Branch length variation (+- %):
Branch length falloff (%):
Branch angle (°):
Branch angle variation (+- %):
Draw


The language for organizing your webpage
A scripting language for data manipulation
The language to stylize your website
A beginner's introduction to object oriented programming
The free-to-use programming language of choice by developers around the world
Java but spacing matters


lser
OS/161 Reference Manual
Name
lser - LAMEbus serial port
Synopsis
device lser* at lamebus*
Description
lser is the driver for the CS161 LAMEbus serial port card. It does not
provide any internal buffering; that is expected to happen at a higher
level. It can, however, operate in either polled or interrupt-driven
output mode.
The system console device can be attached to an
lser instance.
See Also
lamebus


Thank you for your interest in Liferay Portal, the leading open source web platform for the enterprise.
Enterprises around the world use Liferay Portal to build solutions that deliver immediate results and long-term value. Application integration, web publishing, social networking, and team collaboration are just a few of the use-cases for Liferay Portal. Learn how Liferay can help your organization by test-driving some of the various features on this site.
Liferay Portal is lightweight but also feature-rich, with broad product capabilities (over 70 out-of-the-box portlets) to provide immediate return on investment:
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Enterprise Collaboration
Built-in Social Networking and Mashups
Enterprise Portal framework and Identity Management
Liferay values the importance of communication and knowledge-sharing between users. For that reason, Liferay Portal was designed with usability in mind. Increase productivity by creating workspaces and workflows for documents, content and more. Create a central hub of data and collaboration for your entire team.
Test drive how collaboration and knowledge management might work depending on your user role.
SOA - Streamline development with built-in developer tools, LDAP, web services, and Spring-based architecture. Rapidly produce portlets and applications that are customizable to your needs.
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Mashups - Liferay supports mashup development with support for widgets, Facebook® integration, iGoogle® support, and GoogleMaps®.
As the only major independent portal vendor in the market without a stack agenda, Liferay is committed to making technology decisions based on customer satisfaction, not on maximizing revenue from other product lines.
Liferay, Inc. offers a full suite of professional services built around our technology:
For other case studies and more, visit Liferay: Stories.
To learn more about Liferay's products and
services, please visit www.liferay.com.
Visit us: Liferay.com
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detect Detects objects of different sizes in the input image.
boxes = classifier.detect(im)
[boxes, numDetections] = classifier.detect(im)
[boxes, rejectLevels, levelWeights] = classifier.detect(im)
[...] = classifier.detect(im, 'Option', optionValue, ...)
Input
- im Matrix of the type
uint8
containing an image where
objects are detected.
Output
- boxes Cell array of rectangles where each rectangle
contains the detected object, the rectangles may be
partially outside the original image.
- numDetections optional vector of detection numbers for the
corresponding objects. An object's number of detections is
the number of neighboring positively classified rectangles
that were joined together to form the object.
- rejectLevels optional output vector of integers. Implies
OutputRejectLevels=true
.
- levelWeights optional output vector of doubles. Implies
OutputRejectLevels=true
.
Options
- ScaleFactor Parameter specifying how much the image size
is reduced at each image scale. default 1.1
- MinNeighbors Parameter specifying how many neighbors each
candiate rectangle should have to retain it. default 3
- MinSize Minimum possible object size. Objects smaller than
that are ignored. Not set by default.
- MaxSize Maximum possible object size. Objects larger than
that are ignored. Not set by default.
- OutputRejectLevels if is true returns
rejectLevels
and
levelWeights
. default false
- DoCannyPruning Parameter with the same meaning for an old
cascade as in the function
cvHaarDetectObjects
. It is
not used for a new cascade. default false
- ScaleImage Parameter with the same meaning for an old
cascade as in the function
cvHaarDetectObjects
. It is
not used for a new cascade. default false
- FindBiggestObject Parameter with the same meaning for an
old cascade as in the function
cvHaarDetectObjects
. It
is not used for a new cascade. default false
- DoRoughSearch Parameter with the same meaning for an old
cascade as in the function
cvHaarDetectObjects
. It is
not used for a new cascade. default false
The detected objects are returned as a cell array of rectangles.
Note that the function has three variants based on the number of
output arguments.
The function is parallelized with the TBB library.


Apache Arrow is a cross-language development platform for in-memory data. It specifies a standardized language-independent columnar memory format for flat and hierarchical data, organized for efficient analytic operations on modern hardware. It also provides computational libraries and zero-copy streaming messaging and interprocess communication.
The arrow
package exposes an interface to the Arrow C++ library to access many of its features in R. This includes support for working with Parquet (read_parquet()
, write_parquet()
) and Feather (read_feather()
, write_feather()
) files, as well as lower-level access to Arrow memory and messages.
Install the latest release of arrow
from CRAN with
Conda users on Linux and macOS can install arrow
from conda-forge with
On macOS and Windows, installing a binary package from CRAN will handle Arrow’s C++ dependencies for you. On Linux, unless you use conda
you’ll need to first install the C++ library. See the Arrow project installation page to find pre-compiled binary packages for some common Linux distributions, including Debian, Ubuntu, and CentOS. You’ll need to install libparquet-dev
on Debian and Ubuntu, or parquet-devel
on CentOS. This will also automatically install the Arrow C++ library as a dependency. Other Linux distributions must install the C++ library from source.
If you install the arrow
package from source and the C++ library is not found, the R package functions will notify you that Arrow is not available. Call
for version- and platform-specific guidance on installing the Arrow C++ library.
When installing from source, if the R and C++ library versions do not match, installation may fail. If you’ve previously installed the libraries and want to upgrade the R package, you’ll need to update the Arrow C++ library first.
library(arrow)
#>
#> Attaching package: 'arrow'
#> The following object is masked from 'package:utils':
#>
#> timestamp
set.seed(24)
tab <- Table$create(
x = 1:10,
y = rnorm(10),
z = as.factor(rep(c("b", "c"), 5))
)
tab
#> Table
#> 10 rows x 3 columns
#> $x <int32>
#> $y <double>
#> $z <dictionary<values=string, indices=int8>>
tab$x
#> ChunkedArray
#> <int32>
#> [
#> 1,
#> 2,
#> 3,
#> 4,
#> 5,
#> 6,
#> 7,
#> 8,
#> 9,
#> 10
#> ]
as.data.frame(tab)
#> # A tibble: 10 x 3
#> x y z
#> <int> <dbl> <fct>
#> 1 1 -0.546 b
#> 2 2 0.537 c
#> 3 3 0.420 b
#> 4 4 -0.584 c
#> 5 5 0.847 b
#> 6 6 0.266 c
#> 7 7 0.445 b
#> 8 8 -0.466 c
#> 9 9 -0.848 b
#> 10 10 0.00231 c
Binary R packages for macOS and Windows are built daily and hosted at https://dl.bintray.com/ursalabs/arrow-r/. To install from there:
These daily package builds are not official Apache releases and are not recommended for production use. They may be useful for testing bug fixes and new features under active development.
Linux users will need to build the Arrow C++ library from source, then install the R package from source, as described in the next section.
Windows and macOS users who wish to contribute to the R package and don’t need to alter the Arrow C++ library may be able to obtain a recent version of the library without building from source. On macOS, you may install the C++ library using Homebrew:
# For the released version:
brew install apache-arrow
# Or for a development version, you can try:
brew install apache-arrow --HEAD
On Windows, you can download a .zip file with the arrow dependencies from the rwinlib project, and then set the RWINLIB_LOCAL
environment variable to point to that zip file before installing the arrow
R package. That project contains released versions of the C++ library; for a development version, Windows users may be able to find a binary by going to the Apache Arrow project’s Appveyor, selecting an R job from a recent build, and downloading the build\arrow-*.zip
file from the “Artifacts” tab.
If you need to alter both the Arrow C++ library and the R package code, or if you can’t get a binary version of the latest C++ library elsewhere, you’ll need to build it from source too.
First, install the C++ library. See the C++ developer guide for details.
Note that after any change to the C++ library, you must reinstall it and run make clean
or git clean -fdx .
to remove any cached object code in the r/src/
directory before reinstalling the R package. This is only necessary if you make changes to the C++ library source; you do not need to manually purge object files if you are only editing R or Rcpp code inside r/
.
Once you’ve built the C++ library, you can install the R package and its dependencies, along with additional dev dependencies, from the git checkout:
cd ../../r
R -e 'install.packages(c("devtools", "roxygen2", "pkgdown", "covr")); devtools::install_dev_deps()'
R CMD INSTALL .
If you need to set any compilation flags while building the Rcpp extensions, you can use the ARROW_R_CXXFLAGS
environment variable. For example, if you are using perf
to profile the R extensions, you may need to set
export ARROW_R_CXXFLAGS=-fno-omit-frame-pointer
If the package fails to install/load with an error like this:
** testing if installed package can be loaded from temporary location
Error: package or namespace load failed for 'arrow' in dyn.load(file, DLLpath = DLLpath, ...):
unable to load shared object '/Users/you/R/00LOCK-r/00new/arrow/libs/arrow.so':
dlopen(/Users/you/R/00LOCK-r/00new/arrow/libs/arrow.so, 6): Library not loaded: @rpath/libarrow.14.dylib
try setting the environment variable R_LD_LIBRARY_PATH
to wherever Arrow C++ was put in make install
, e.g. export R_LD_LIBRARY_PATH=/usr/local/lib
, and retry installing the R package.
For any other build/configuration challenges, see the C++ developer guide.
The arrow
package uses some customized tools on top of Rcpp
to prepare its C++ code in src/
. If you change C++ code in the R package, you will need to set the ARROW_R_DEV
environment variable to TRUE
(optionally, add it to your~/.Renviron
file to persist across sessions) so that the data-raw/codegen.R
file is used for code generation.
The codegen.R script has these additional dependencies:
We use Google C++ style in our C++ code. Check for style errors with
Fix any style issues before committing with
The lint script requires Python 3 and clang-format-7
. If the command isn’t found, you can explicitly provide the path to it like CLANG_FORMAT=$(which clang-format-7) ./lint.sh
. On macOS, you can get this by installing LLVM via Homebrew and running the script as CLANG_FORMAT=$(brew --prefix llvm@7)/bin/clang-format ./lint.sh
Within an R session, these can help with package development:
devtools::load_all() # Load the dev package
devtools::test(filter="^regexp$") # Run the test suite, optionally filtering file names
devtools::document() # Update roxygen documentation
rmarkdown::render("README.Rmd") # To rebuild README.md
pkgdown::build_site() # To preview the documentation website
devtools::check() # All package checks; see also below
covr::package_coverage() # See test coverage statistics
Any of those can be run from the command line by wrapping them in R -e '$COMMAND'
. There’s also a Makefile
to help with some common tasks from the command line (make test
, make doc
, make clean
, etc.)


Hi, I'm Colton.
I recently graduated from high school and am currently doing a web development internship at Amuse Digital. I've been coding for a relatively short amount of time, and have been mostly focusing on front-end development. After my internship at Amuse I plan on taking some web development courses at The Iron Yard in Houston.