Tutorial by Examples: an

Creating and distributing packages

This is a compact guide about how to quickly create an R package from your code. Exhaustive documentations will be linked when available and should be read if you want a deeper knowledge of the situation. See Remarks for more resources. The directory where your code stands will be refered as ./, an...

R Language • Creating packages with devtools

Use an Applescript as a shell function

You're not limited to single line Applescript code. Here we take the previous two examples and combine them into a single function. #!/bin/bash pageinfo() { osascript -e \ 'tell app "safari" tell the current tab of window 1 return {url & "\n" & ...

applescript • Applescript from the Terminal command line

Transfer Learning using Keras and VGG

In this example, three brief and comprehensive sub-examples are presented: Loading weights from available pre-trained models, included with Keras library Stacking another network for training on top of any layers of VGG Inserting a layer in the middle of other layers Tips and general rule-of-t...

keras • Transfer Learning and Fine Tuning using Keras

cleanUpOldData

public static void cleanUpOldData(AmazonDynamoDB amazonDynamoDB, String dynamoDBTablesPrefix, String tableName, String dateRangeField, String dateHashKey, String dateIndex, Class clazz) { log.info(String.format("Cleaning old data from table: %s", tab...

amazon-dynamodb • Dynamodb delete data over time

Generate User model from command line

To generate json user model with username, password_hash, email_id, created_at, updated_at, type mix phoenix.gen.json User users username:string email_id:string password_hash:string timestamps()

phoenix-framework • Ecto models usage in phoenix

Using numpy.save and numpy.load

np.save and np.load provide a easy to use framework for saving and loading of arbitrary sized numpy arrays: import numpy as np a = np.random.randint(10,size=(3,3)) np.save('arr', a) a2 = np.load('arr.npy') print a2

numpy • Saving and loading of Arrays

Angular Request

$http.post("\<domain\>/user-registration/", {username: username, password: password}) .then(function (data) { // Do success actions here });

django-rest-framework • Using django-rest-framework with AngularJS as front-end framework.

Whitespace handling

To remove whitespace (spaces, tabs, newlines…) between HTML tags use spaceless tag: {% spaceless %} <div> <span>foo bar </span> </div> {% endspaceless %} {# produces output <div><strong>foo bar </strong></div> #} If you need ...

twig • Basic template syntax

Page, DOM and Browser loading

This is an example to explain the variations of load events. onload event <body onload="someFunction()"> <img src="image1" /> <img src="image2" /> </body> <script> function someFunction() { console.log("Hi! I am l...

JavaScript • Events

from a public repository using the command line and renaming file

This example grabs the Node.gitignore file from GitHub's gitignore repository, downloads it to your current working directory and renames it to .gitignore - all very typical actions for someone starting a new node.js project. $ curl http://github.com/github/gitignore/raw/master/Node.gitignore -o .g...

github • download single file from GitHub repository

find the url of the file you want to download

navigate to the desired file in a repository click the 'raw' button copy the url from the address bar See the following example from GitHub's gitignore repository: http://github.com/github/gitignore/raw/master/Node.gitignore You can quickly recognize a url that will work to download an indiv...

github • download single file from GitHub repository

Delegate Can be used as a layer to reduce boilerplate

Consider Kotlin's Null Type system and WeakReference<T>. So let's say we have to save some sort of reference and we wanted to avoid memory leaks, here is where WeakReference comes in. take for example this: class MyMemoryExpensiveClass { companion object { var reference: WeakR...

Kotlin • Delegated properties

Load the Image from Resource from Android Device. Using Intents.

Using Intents to Load the Image from Gallery. Initially you need to have the permission <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/> Use the Following Code to have the layout as designed follows. <?xml version="1.0" enco...

Android • Loading Bitmaps Effectively

AngularJS ng-repeat introduction and challenges

ng-repeat is the built-in directive provided by AngularJS, mostly used for listing the array elements on UI dynamically as per the changes in our model. Official "ng-repeat" docs can be found at : https://docs.angularjs.org/api/ng/directive/ngRepeat Also the most common error faced whil...

angularjs-ng-repeat • Getting started with angularjs-ng-repeat

Cryptographically Secure Random Data

There are times when the framework's Random() class may not be considered random enough, given that it is based on a psuedo-random number generator. The framework's Crypto classes do, however, provide something more robust in the form of RNGCryptoServiceProvider. The following code samples demonstr...

C# Language • Cryptography (System.Security.Cryptography)

Execute anonymous block

You can execute anonymous block. This example shows also how to return value from dynamic SQL: declare query_text varchar2(1000) := 'begin :P_OUT := cos(:P_IN); end;'; in_value number := 0; out_value number; begin execute immediate query_text using out out_value, in in_value; dbms_o...

Oracle Database • Dynamic SQL

Commanding in MVVM

Commands are used for handling Events in WPF while respecting the MVVM-Pattern. A normal EventHandler would look like this (located in Code-Behind): public MainWindow() { _dataGrid.CollectionChanged += DataGrid_CollectionChanged; } private void DataGrid_CollectionChanged(object sender, S...

wpf • MVVM in WPF

Set yarn as default package manager for @angular/cli

Yarn is an alternative for npm, the default package manager on @angular/cli. If you want to use yarn as package manager for @angular/cli follow this steps: Requirements yarn (npm install --global yarn or see the installation page) @angular/cli (npm install -g @angular/cli or yarn global add @an...

Angular 2 • Angular-cli

Apply Filter to Image Patches and Set Each Pixel as the Mean of the Result of Each Patch

Many modern Image Processing algorithms use patches are their basic element to work on. For instance one could denoise patches (See BM3D Algorithm). Yet when building the image form the processed patches we have many results for the same pixel. One way to deal with it is taking the average (Empir...

MATLAB Language • Usage of `accumarray()` Function

Push a Value on an Array

There are two ways to push an element to an array: array_push and $array[] = The array_push is used like this: $array = [1,2,3]; $newArraySize = array_push($array, 5, 6); // The method returns the new size of the array print_r($array); // Array is passed by reference, therefore the original ar...

PHP • Executing Upon an Array