Tutorial by Examples: an

Google Analytics in cordova without any plugin.

Insert the analytics function within index.js function analytics(){ (function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){ (i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o), m=s.getElementsByTagName(o)[0];a.async=1;a...

Cordova • Google Analytics in Cordova

Adjusting brightness and contrast of an image in c++

// main.cpp : Defines the entry point for the console application. // #include "opencv2/highgui/highgui.hpp" #include <iostream> using namespace cv; using namespace std; int main(int argc, const char** argv) { Mat img = imread("lena30.jpg", CV_LOAD_IMAGE...

opencv • Contrast and Brightness in C++

Handling existing InputStreams and OutputStreams

Reading the content of an InputStream as a byte array: // Reading from a file try (InputStream in = new FileInputStream("in.dat")) { byte[] content = ByteStreams.toByteArray(in); // do something with content } Copying an InputStream to an OutputStream: // Copying the content f...

guava • I/O

List, wait and stop processes

To get a list of the processes running in the current terminal, you can use ps : $ sleep 1000 & $ ps -opid,comm PID COMMAND 1000 sh 1001 sleep 1002 ps To kill a running process, use kill with the process ID (PID) indicated by ps: $ kill 1001 $ ps -opid,comm PID COMMAND 1000 sh...

sh • Job Control

Handling existing Readers and Writers

Reading the content of a Reader as a String: // Reading from a file try (Reader reader = new FileReader("in.txt")) { String content = CharStreams.toString(reader); // do something with content } Reading the content of a Reader as a list of line contents: try (Reader reader = n...

guava • I/O

Pivot and unpivot tabular data with data.table - I

Convert from wide form to long form Load data USArrests from datasets. data("USArrests") head(USArrests) Murder Assault UrbanPop Rape Alabama 13.2 236 58 21.2 Alaska 10.0 263 48 44.5 Arizona 8.1 294 80 31.0 Arkansas 8...

R Language • Pivot and unpivot with data.table

Pivot and unpivot tabular data with data.table - II

Convert from long form to wide form To recover data from the previous example, use dcast like so. DTc <- dcast(DTmu, State + UrbanPop ~ Crime) This gives the data in the original wide form. State UrbanPop Murder Assault Rape 1: Alabama 58 13.2 236 21.2 2:...

R Language • Pivot and unpivot with data.table

Using an index for a date and time lookup

Many real-world database tables have many rows with DATETIME OR TIMESTAMP column values spanning a lot of time, including years or even decades. Often it's necessary to use a WHERE clause to retrieve some subset of that timespan. For example, we might want to retrieve rows for the date 1-September-2...

MySQL • Date and Time Operations

Build Tools 24.0.0 - Android

image: jangrewe/gitlab-ci-android before_script: - apt-get --quiet update --yes - apt-get --quiet install --yes wget tar unzip lib32stdc++6 lib32z1 openjdk-8-jdk - echo y | ${ANDROID_HOME}/tools/android --silent update sdk --no-ui --all --filter android-24 - echo y | ${ANDROID_HOME}/too...

gitlab • Android CI Configuration

Map, filter, and reduce

Two of the most fundamental higher-order functions included in the standard library are map and filter. These functions are generic and can operate on any iterable. In particular, they are well-suited for computations on arrays. Suppose we have a dataset of schools. Each school teaches a particular...

Julia Language • Higher-Order Functions

Pitfall - Using "Yoda notation" to avoid NullPointerException

A lot of example code posted on StackOverflow includes snippets like this: if ("A".equals(someString)) { // do something } This does "prevent" or "avoid" a possible NullPointerException in the case that someString is null. Furthermore, it is arguable that ...

Java Language • Java Pitfalls - Nulls and NullPointerException

Setting and getting pixel values of a Gray image in C++

// PixelAccessTutorial.cpp : Defines the entry point for the console // Environment: Visual studio 2015, Windows 10 // Assumptions: Opecv is installed configured in the visual studio project // Opencv version: OpenCV 3.1 #include "stdafx.h" #include<opencv2/core/core.hpp> #i...

opencv • Pixel Access

Angular 2 for-loop

For live plnkr click... <!doctype html> <html> <head> <title>ng for loop in angular 2 with ES5.</title> <script type="text/javascript" src="https://code.angularjs.org/2.0.0-alpha.28/angular2.sfx.dev.js"></script> <scr...

Angular 2 • Angular - ForLoop

Canny Algorithm - C++

Below is an usage of canny algorithm in c++. Note that the image is first converted to grayscale image, then Gaussian filter is used to reduce the noise in the image. Then Canny algorithm is used for edge detection. // CannyTutorial.cpp : Defines the entry point for the console application. // En...

opencv • Edge detection

Android Studio update channels

Overview Android Studio's built-in update mechanism can be set to receive updates through any one of these four channels: Canary: Bleeding edge, released about weekly. These are early previews released in order to obtain real-world feedback during development. The canary channel will always have...

android-studio • Android Studio updates

Texture and Framebuffer

You can attach an image in a texture to a framebuffer, so that you can render directly to that texture. glGenFramebuffers (1, &framebuffer); glBindFramebuffer (GL_FRAMEBUFFER, framebuffer); glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, ...

opengl • Texturing

Installation of OpenXML SDK and productivity tool on your computer

Go to the Microsoft link for the OpenXML SDK download. Click the red download button. On the next screen click the box next to OpenXMLSDKToolV25.msi and click next to begin the download. Once the download is complete, launch the OpenXMLSDKToolV25.msi and follow the instructions on the screen. Th...

openxml • Getting started with openxml

Creating a new project from the Game template.

To set up a default SceneKit project you can use the Game Template.

scenekit • Getting started with scenekit

INSERT data and RETURING values

If you are inserting data into a table with an auto increment column and if you want to get the value of the auto increment column. Say you have a table called my_table: CREATE TABLE my_table ( id serial NOT NULL, -- serial data type is auto incrementing four-byte integer name character varying...

postgresql • INSERT

Load an animation from a collada or scn file

Swift Function for loading an animation from a file: func animationFromSceneNamed(path: String) -> CAAnimation? { let scene = SCNScene(named: path) var animation:CAAnimation? scene?.rootNode.enumerateChildNodes({ child, stop in if let animKey = child.animationKeys.first...

scenekit • Animation