Tutorial by Examples: in

Unsupervised Learning

Unsupervised learning allows us to approach problems with little or no idea what our results should look like. We can derive structure from data where we don't necessarily know the effect of the variables. The most common type of unsupervised learning is cluster analysis or clustering. It is the ta...

machine-learning • Types of learning

Installation or Setup

Detailed instructions on getting spring-aop set up or installed.

spring-aop • Getting started with spring-aop

InitialsImageFactory

class InitialsImageFactory: NSObject { class func imageWith(name: String?) -> UIImage? { let frame = CGRect(x: 0, y: 0, width: 50, height: 50) let nameLabel = UILabel(frame: frame) nameLabel.textAlignment = .center nameLabel.backgroundColor = .lightGray nameLabel.textColor = .white nam...

Swift Language • Generate UIImage of Initials from String

Installation or Setup

Detailed instructions on getting ngrx set up or installed.

ngrx • Getting started with ngrx

AngularFire initialization

First of all you need to initialize the angularfire modules in your app module like this: const firebaseConfig = { apiKey: 'XXXXXXXXXX', authDomain: 'XXXXXXXXXX', databaseURL: 'XXXXXXXXXX', storageBucket: 'XXXXXXXXXX', messagingSenderId: 'XXXXXXXXXX' }; You can get this keys by...

ionic2 • Angularfire2 with Ionic2

Using AngularFire2

Once you have it on your app, just import it: import { AngularFireDatabase } from 'angularfire2/database'; constructor (private _af: AngularFireDatabase) {} With this Observable List you can access to a list of items under a path, for example if you have root/items/food you can get food items l...

ionic2 • Angularfire2 with Ionic2

How use ansible to install mysql binary file

hosts: mysql tasks: name: Add mysql user user: name: mysql shell: /sbin/nologin name: install the latest version of libselinux-python yum: name: libselinux-python state: latest name: install perl yum: name: perl state: latest name: remove the mysql-libs package y...

ansible • Ansible install mysql

Recommended ways to execute shell code in Ruby:

Open3.popen3 or Open3.capture3: Open3 actually just uses Ruby's spawn command, but gives you a much better API. Open3.popen3 Popen3 runs in a sub-process and returns stdin, stdout, stderr and wait_thr. require 'open3' stdin, stdout, stderr, wait_thr = Open3.popen3("sleep 5s && ls&q...

Ruby Language • Operating System or Shell commands

Clasic ways to execute shell code in Ruby:

Exec: exec 'echo "hello world"' or exec ('echo "hello world"') The System Command: system 'echo "hello world"' Will output "hello world" in the command window. or system ('echo "hello world"') The system command can return a true if ...

Ruby Language • Operating System or Shell commands

Consider we are connecting MYSQL RDS with your rails application.

Steps to create MYSQL database Login to amazon account and select RDS service Select Launch DB Instance from the instance tab By defaul MYSQL Community Edition will be selected, hence click the select button Select the database purpose, say production and click next step Provide the mysql ver...

Ruby on Rails • Adding an Amazon RDS to your rails application

Introduction to regular expressions in Kotlin

This post shows how to use most of the functions in the Regex class, work with null safely related to the Regex functions, and how raw strings makes it easier to write and read regex patterns. The RegEx class To work with regular expressions in Kotlin, you need to use the Regex(pattern: String) cl...

Kotlin • Regex

Installation or Setup

Detailed instructions on getting boto3 set up or installed.

boto3 • Getting started with boto3

Simple HttpClient AuthToken Interceptor (Angular 4.3+)

import { Injectable } from '@angular/core'; import { HttpEvent, HttpHandler, HttpInterceptor, HttpRequest } from '@angular/common/http'; import { UserService } from '../services/user.service'; import { Observable } from 'rxjs/Observable'; @Injectable() export class AuthHeaderInterceptor imple...

Angular 2 • Http Interceptor

Finding an object's class

To find whether an object was constructed by a certain constructor or one inheriting from it, you can use the instanceof command: //We want this function to take the sum of the numbers passed to it //It can be called as sum(1, 2, 3) or sum([1, 2, 3]) and should give 6 function sum(...arguments) {...

JavaScript • Datatypes in Javascript

Implementing policy deny rules

It is occasionally desirable to deny a certain Permission to some ProtectionDomain, regardless of any other permissions that domain accrues. This example demonstrates just one of all the possible approaches for satisfying this kind of requirement. It introduces a "negative" permission clas...

Java Language • SecurityManager

Place the user's pin in the map.

Note, if you are not familiar with the google maps api, you may read the precedent example (basics) in order to understand this little example. First, initialize the map. You may add an map's element in your HTML code and a bite of CSS like this: <!DOCTYPE html> <html> <h...

google-maps-api-3 • Getting started with google-maps-api-3

Instalating Guide JavaFX 8

First of all, I will use Netbeans for this tutorial and this Windows version. Intall Scene Builder: When you have installed Netbeans on your computer, you must install Gluon Scene Builder. Nowadays, Oracle does´t work with Scene Builder and they made it Open Source, to work with the Gluon versi...

javafx-8 • Getting started with javafx-8

Running Thread Safe Code from an Asynchronous Task

Sometimes you'll need to execute synchronous code from within an asynchronous task. To do this, simply schedule a synchronous task from within the asynchronous block. Bukkit.getScheduler().runTaskTimerAsynchronously(VoidFlame.getPlugin(), () -> { Bukkit.getScheduler().runTask(VoidFlame.ge...

bukkit • Scheduler Programming

Create association with new/custom file types via Info.plist

<key>CFBundleDocumentTypes</key> <array> <dict> <key>CFBundleTypeIconFile</key> <string>Icon file for associated file</string> <key>CFBundleTypeName</key> <string>My file format</string>...

osx • File association

HTML text in UILabel

NSString * htmlString = @"<html><body> <b> Example bold text in HTML </b> </body></html>"; NSAttributedString * attrStr = [[NSAttributedString alloc] initWithData:[htmlString dataUsingEncoding:NSUnicodeStringEncoding] options:@{ NSDocumentTypeDocumentAt...

iOS • attributedText in UILabel