Tutorial by Examples: id

Zip file on android

import android.util.Log; import java.io.BufferedInputStream; import java.io.BufferedOutputStream; import java.io.FileInputStream; import java.io.FileOutputStream; import java.util.zip.ZipEntry; import java.util.zip.ZipOutputStream; public class Compress { private static f...

Android • Zip file in android

Avoid the $q Deferred Anti-Pattern

Avoid this Anti-Pattern var myDeferred = $q.defer(); $http(config).then(function(res) { myDeferred.resolve(res); }, function(error) { myDeferred.reject(error); }); return myDeferred.promise; There is no need to manufacture a promise with $q.defer as the $http service alread...

AngularJS • Angular promises with $q service

ROC-AUC score with overriding and cross validation

One needs the predicted probabilities in order to calculate the ROC-AUC (area under the curve) score. The cross_val_predict uses the predict methods of classifiers. In order to be able to get the ROC-AUC score, one can simply subclass the classifier, overriding the predict method, so that it would a...

scikit-learn • Receiver Operating Characteristic (ROC)

gulp CLI docs

Flags gulp has very few flags to know about. All other flags are for tasks to use if needed. -v or --version will display the global and local gulp versions --require <module path> will require a module before running the gulpfile. This is useful for transpilers but also has other applica...

gulp • Getting started with gulp

Guide

π's Metaprogramming bits & bobs Goals: Teach through minimal targeted functional/useful/non-abstract examples (e.g. @swap or @assert) that introduce concepts in suitable contexts Prefer to let the code illustrate/demonstrate the concepts rather than paragraphs of explanation Avoi...

Julia Language • Metaprogramming

Canny Edge Video from Webcam Capture - Python

import cv2 def canny_webcam(): "Live capture frames from webcam and show the canny edge image of the captured frames." cap = cv2.VideoCapture(0) while True: ret, frame = cap.read() # ret gets a boolean value. True if reading is successful (I think). frame ...

opencv • Edge detection

Emacs Rocks Video Tutorials

Good video tutorials about Emacs can be found at emacsrocks.com.

emacs • Getting started with emacs

Two widgets with different layouts declaration

Declare two receivers in a manifest file: <receiver android:name=".UVMateWidget" android:label="UVMate Widget 1x1"> <intent-filter> <action android:name="android.appwidget.action.APPWIDGET_UPDATE" /> </intent-filter...

Android • Widgets

AngularJS Getting Started Video Tutorials

There are a lot of good video tutorials for the AngularJS framework on egghead.io https://egghead.io/courses/angularjs-app-from-scratch-getting-started https://egghead.io/courses/angularjs-application-architecture https://egghead.io/courses/angular-material-introduction https://egghead.io/co...

AngularJS • Getting started with AngularJS

Example: Consider will have two threads T1 and T2.

How do you detect them? If the same variable/resource/memory location is accessible by multiple threads and at least of the thread is changing the value of variable/resource/memory location, then Race Condition can occurred. Because if a thread is changing the value of variable/resource/memory ...

pthreads • Race condition in pthreads

Hide strange unwanted and extra Xcode 8 logs.

From Xcode menu open: Product > Scheme > Edit Scheme. On your Environment Variables set OS_ACTIVITY_MODE = disable

Xcode • Xcode Tips

Free Empty ~~ Identity

Given data Empty a we have data Free Empty a = Pure a -- the Free constructor is impossible! which is isomorphic to data Identity a = Identity a

Haskell Language • Common monads as free monads

Free Identity (Nat,) Writer Nat

Given data Identity a = Identity a we have data Free Identity a = Pure a | Free (Identity (Free Identity a)) which is isomorphic to data Deferred a = Now a | Later (Deferred a) or equivalently (if you promise to evaluate the fst element first) (Nat, a), aka Writer...

Haskell Language • Common monads as free monads

Cofree Identity ~~ Stream

Given data Identity a = Identity a we have data Cofree Identity a = a :< Identity (Cofree Identity a) which is isomorphic to data Stream a = Stream a (Stream a)

Haskell Language • Common functors as the base of cofree comonads

Consider Writing More Documentation, Tests, Logging and Assertions Instead of Using a Debugger

Debugging takes time and effort. Instead of chasing bugs with a debugger, consider spending more time on making your code better by: Write and run Tests. Python and Django have great builtin testing frameworks - that can be used to test your code much faster than manually with a debugger. Writ...

Django • Debugging

Custom Camera Control - Mouse-based Sliding

Here's an example of a custom camera controller. This reads the position of the mouse within the client window, and then slides the camera around as if it were following the mouse on the window. index.html <html> <head> <title>Three.js Custom Mouse Camera Control Ex...

three.js • Camera Controls in Three.js

NSRegularExpression for mail validation

func isValidEmail(email: String) -> Bool { let emailRegEx = "[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,4}" let emailTest = NSPredicate(format:"SELF MATCHES %@", emailRegEx) return emailTest.evaluate(with: email) } or you could use String extensio...

Swift Language • NSRegularExpression in Swift

Change hyperlink of fields/columns inside the list view using CSR

Below example shows how to change the hyperlink for "ID" and "Title(LinkTitle)" field inside the list view using CSR. Step1 : Create a JS file and paste below code (function () { function registerRenderer() { var ctxForm = {}; ctxForm.Templates = {}...

sharepoint • SharePoint 2013 Client Side Rendering

Hide column from SharePoint list view using CSR.

This example shows how to hide a "Date" field from the SharePoint list view using CSR. (function () { function RemoveFields(ctx) { var fieldName = "Date"; // here Date is field or column name to be hide var header = document.querySelectorAll("[d...

sharepoint • SharePoint 2013 Client Side Rendering

H15 - Idle connection

The dyno did not send a full response and was terminated due to 55 seconds of inactivity. For example, the response indicated a Content-Length of 50 bytes which were not sent in time. 2010-10-06T21:51:37-07:00 heroku[router]: at=error code=H15 desc="Idle connection" method=GET path="...

heroku • Heroku Error Codes