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Factor variables in R

This article by Jaynal Abedin and Kishor Kumar Das , authors of the book Data Manipulation with R Second Edition , will discuss factor variables in R. In any data analysis task, the majority of the time is dedicated to data cleaning and preprocessing. Sometimes, it is considered that about 80 percent of the effort is devoted to data cleaning before conducting the actual analysis. Also, in real-world data, we often work with categorical variables. A variable that takes only a limited number of distinct values is usually known as a categorical variable, and in R, it is known as a factor . Working with categorical variables in R is a bit technical, and in this article, we have tried to demystify this process of dealing with categorical variables.

Creating Games with Cocos2d-x is Easy and 100 percent Free

In this article by Raydelto Hernandez , the author of the book  Building Android games with Cocos2d-x , we will talk about the Cocos2d-x game engine, which is widely used to create Android games. The launch of the Apple App Store back in 2008 leveraged the reach capacity of indie game developers who since its occurrence are able to reach millions of users and compete with large companies, outperforming them in some situations. This reality led the trend of creating reusable game engines, such as Cocos2d-iPhone, which is written natively using Objective-C by the Argentine iPhone developer, Ricardo Quesada. Cocos2d-iPhone allowed many independent developers to reach the top charts of downloads.

An introduction to testing AngularJS directives

In this article by Simon Bailey , the author of  AngularJS Testing Cookbook , we will cover the following recipes: Starting with testing directives Setting up templateUrl Searching elements using selectors Accessing basic HTML content Accessing repeater content

From a Static to an Interactive and Dynamic Dashboard

In this article, by David Lai and Xavier Hacking , authors of  SAP BusinessObjects Dasboards 4.1 Cookbook , we will provide developers with recipes on interactivity and look and feel of the dashboards, which will improve the dashboard user experience. We will cover the following recipes: Using the Hierarchical Table Inputting data values Displaying alerts on a map Changing the look of a chart

WooCommerce Basics

In this article by Patrick Rauland , author of the book WooCommerce Cookbook , we will focus on the following topics: Installing WooCommerce Installing official WooThemes plugins Manually creating WooCommerce pages Creating a WooCommerce plugin

Optimizing JavaScript for iOS Hybrid Apps

In this article by Chad R. Adams , author of the book, Mastering JavaScript High Performance , we are going to take a look at the process of optimizing JavaScript for iOS web apps (also known as hybrid apps). We will take a look at some common ways of debugging and optimizing JavaScript and page performance, both in a device's web browser and a standalone app's web view. Also, we'll take a look at the Apple Web Inspector and see how to use it for iOS development. Finally, we will also gain a bit of understanding about building a hybrid app and learn the tools that help to better build JavaScript-focused apps for iOS. Moreover, we'll learn about a class that might help us further in this. We are going to learn about the following topics in the article: Getting ready for iOS development iOS hybrid development

GUI Components in Qt 5

In this article by Symeon Huang , author of the book Qt 5 Blueprints , explains typical and basic GUI components in Qt 5

Dealing with Legacy Code

In this article by Arun Ravindran , author of the book Django Best Practices and Design Patterns , we will discuss the following topics: Reading a Django code base Discovering relevant documentation Incremental changes versus full rewrites Writing tests before changing code Legacy database integration

Getting Started

In this article by Mark Dunkerley , author of the book  Learning AirWatch , you will get a full understanding of all the tools included in Enterprise Mobility Management ( EMM ) with AirWatch by VMware's mobile management suite. We will go through each of the toolsets available to ensure that you understand what is available and how to set up and configure each of them. The intention of this book is not to dive into extreme detail of AirWatch's EMM but to give you the knowledge needed to understand, represent, and set up the configurations. Understand that the mobile space is an extremely fast-growing market and some of the information might have already been updated. The information presented in this book is current as of AirWatch 7.3. In this article, we will take a look at what is needed to get started with AirWatch; we will explore the different licensing options and what hosting methods are available with support. We will also look at the different types of devices that are supported along with the different profile options to manage the devices. The following will be covered in this article: An overview of AirWatch Management suite options Hosting options Support options Learning and deployment services Supported devices Device ownership

Securing your Elastix System

In the Article by Gerardo Barajas Puente , author of  Elastix Unified Communications Server Cookbook , we will discuss some topics regarding security in our Elastix Unified CommunicationsSystem.Wewill sharesomerecommendationstoensureoursystem's availability,privacy,andcorrectperformance.Attackers'objectivesmayvaryfromdamaging data,todatastealing,totelephonicfraud,todenialofservice.This listis intendedtominimize any type of attack, but remember that there are no definitivearguments about security; it is a constantlychanging subjectwith newtypesofattacks,challenges,andopportunities. Therecipescoveredin this articleareasfollows: Using Elastix's embedded firewall Using the Security Advanced Settings menu to enable security features Recording and monitoring calls Recording MeetMe rooms (conference rooms) Recording queues' calls Monitoring recordings Upgrading our Elastix system Generating system backups Restoring a backup from one server to another

Getting Started with Intel Galileo

In this article by Onur Dundar , author of the book Home Automation with Intel Galileo , we will see how to develop home automation examples using the Intel Galileo development board along with the existing home automation sensors and devices. In the book, a good review of Intel Galileo will be provided, which will teach you to develop native C/C++ applications for Intel Galileo. After a good introduction to Intel Galileo, we will review home automation's history, concepts, technology, and current trends. When we have an understanding of home automation and the supporting technologies, we will develop some examples on two main concepts of home automation: energy management and security. We will build some examples under energy management using electrical switches, light bulbs and switches, as well as temperature sensors. For security, we will use motion, water leak sensors, and a camera to create some examples. For all the examples, we will develop simple applications with C and C++. Finally, when we are done building good and working examples, we will work on supporting software and technologies to create more user friendly home automation software. In this article, we will take a look at the Intel Galileo development board, which will be the device that we will use to build all our applications; also, we will configure our host PC environment for software development. The following are the prerequisites for this article: A Linux PC for development purposes. All our work has been done on an Ubuntu 12.04 host computer, for this article and others as well. (If you use newer versions of Ubuntu, you might encounter problems with some things in this article.) An Intel Galileo (Gen 2) development board with its power adapter. A USB-to-TTL serial UART converter cable; the suggested cable is TTL-232R-3V3 to connect to the Intel Galileo Gen 2 board and your host system. You can see an example of a USB-to-TTL serial UART cable at http://www.amazon.com/GearMo%C2%AE-3-3v-Header-like-TTL-232R-3V3/dp/B004LBXO2A. If you are going to use Intel Galileo Gen 1, you will need a 3.5 mm jack-to-UART cable. You can see the mentioned cable at http://www.amazon.com/Intel-Galileo-Gen-Serial-cable/dp/B00O170JKY/. An Ethernet cable connected to your modem or switch in order to connect Intel Galileo to the local network of your workplace. A microSD card. Intel Galileo supports microSD cards up to 32 GB storage.

PostgreSQL – New Features

In this article, Jayadevan Maymala , author of the book, PostgreSQL for Data Architects , you will see how to troubleshoot the initial hiccups faced by people who are new to PostgreSQL. We will look at a few useful, but not commonly used data types. We will also cover pgbadger, a nifty third-party tool that can run through a PostgreSQL log. This tool can tell us a lot about what is happening in the cluster. Also, we will look at a few key features that are part of PostgreSQL 9.4 release. We will cover a couple of useful extensions.

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