Tutorial by Examples: en

The Lorenz model

The Lorenz model describes the dynamics of three state variables, X, Y and Z. The model equations are: The initial conditions are: and a, b and c are three parameters with library(deSolve) ## ----------------------------------------------------------------------------- ## Define...

R Language • Solving ODEs in R

ODEs in compiled languages - a benchmark test

When you compiled and loaded the code in the three examples before (ODEs in compiled languages - definition in R, ODEs in compiled languages - definition in C and ODEs in compiled languages - definition in fortran) you are able to run a benchmark test. library(microbenchmark) R <- function(){...

R Language • Solving ODEs in R

Mail with Attachment

MailMessage represents mail message which can be sent further using SmtpClient class. Several attachments (files) can be added to mail message. using System.Net.Mail; using(MailMessage myMail = new MailMessage()) { Attachment attachment = new Attachment(path); myMail.Attachments.Add...

.NET Framework • System.Net.Mail

Example to retrieve local entry from sequences

In WSO2 registry is a content store and a metadata repository. In WSO2 products and particularly WSO2 ESB uses registry to store metadata, artifacts (WSDL, XSD etc.,) and other service configurations like endpoints, sequences etc., Registry in WSO2 ESB has three flavours. Local registry Config...

wso2esb • WSO2 ESB - Local entries

C# Implementation

public class ShellSort { static void SortShell(int[] input, int n) { var inc = 3; while (inc > 0) { int i; for (i = 0; i < n; i++) { var j = i; var temp = input[i]; w...

algorithm • Shell Sort

Frozenset's are immutable and not assignable

foo = frozenset(["bar", 1, "Hello!"]) foo[2] = 7 # ERROR foo.add(3) # ERROR Second line would return an error since frozenset members once created aren't assignable. Third line would return error as frozensets do not support functions that can manipulate members.

Python Language • Immutable datatypes(int, float, str, tuple and frozensets)

Using Environment Variables

The Maya Python interpreter works like a regular Python intepreter, so it will use the same environment variables to find importable files as any other Python 2.6 or 2.7 installation (described in more detail in the Python documentation. If there is no other python installation on your machine you ...

maya • Maya Python Paths

Implementation of Selection sort in C#

I used C# language to implement Selection sort algorithm. public class SelectionSort { private static void SortSelection(int[] input, int n) { for (int i = 0; i < n - 1; i++) { var minId = i; int j; for (j = i + 1; j < n; j++...

algorithm • Selection Sort

Element access

1. at(pos) Returns a reference to the element at position pos with bounds checking. If pos is not within the range of the container, an exception of type std::out_of_range is thrown. The complexity is constant O(1). #include <array> int main() { std::array<int, 3> arr; ...

C++ • std::array

Rendering components

There are two options to render components on server: renderToString and renderToStaticMarkup. renderToString This will render React components to HTML on server. This function will also add data-react- properties to HTML elements so React on client won't have to render elements again. import { r...

React • Introduction to Server-Side Rendering

Simple React Component

We want to be able to compile below component and render it in our webpage Filename: src/index.jsx import React from 'react'; import ReactDOM from 'react-dom'; class ToDo extends React.Component { render() { return (<div>I am working</div>); } } ReactDOM.re...

React • Setting Up React Environment

Install all dependencies

# install react and react-dom $ npm i react react-dom --save # install webpack for bundling $ npm i webpack -g # install babel for module loading, bundling and transpiling $ npm i babel-core babel-loader --save # install babel presets for react and es6 $ npm i babel-preset-react babel-p...

React • Setting Up React Environment

HTML file to use react component

Setup a simple html file in the root of the project directory Filename: index.html <!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title></title> </head> <body> <div id="App"></div> ...

React • Setting Up React Environment

Transpile and bundle your component

Using webpack, you can bundle your component: $ webpack This will create our output file in build directory. Open the HTML page in a browser to see component in action

React • Setting Up React Environment

Using gen_server behavior

A gen_server is a specific finite state machine working like a server. gen_server can handle different type of event: synchronous request with handle_call asynchronous request with handle_cast other message (not defined in OTP specification) with handle_info Synchronous and asynchronous mess...

Erlang Language • gen_server behavior

How to allow reading specific item from group, but prevent listing group members

It is common practice to create groups of items by creating simple value nodes with item ID as key. For example, we can add a user to the group "administrators" by creating a node at /administrators/$user_id with a value true. We don't want anyone to know who administrators are, for securi...

firebase • Database Rules

Tutorial by Examples: en

The Lorenz model

ODEs in compiled languages - a benchmark test

Mail with Attachment

Example to retrieve local entry from sequences

C# Implementation

Frozenset's are immutable and not assignable

Using Environment Variables

Implementation of Selection sort in C#

Element access

Rendering components

Simple React Component

Install all dependencies

HTML file to use react component

Transpile and bundle your component

Using gen_server behavior

How to allow reading specific item from group, but prevent listing group members

Client side csv download using Blob

Phaser environment setup (Asp.Net MVC5 - Typescript - Visual Studio 2015)

IF...Then...Else

Linked List implementation in C++