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Algorithmic Trading

In this article by James Ma Weiming , author of the book Mastering Python for Finance , we will see how algorithmic trading automates the systematic trading process, where orders are executed at the best price possible based on a variety of factors, such as pricing, timing, and volume. Some brokerage firms may offer an application programming interface ( API ) as part of their service offering to customers who wish to deploy their own trading algorithms. For developing an algorithmic trading system, it must be highly robust and handle any point of failure during the order execution. Network configuration, hardware, memory management and speed, and user experience are some factors to be considered when designing a system in executing orders. Designing larger systems inevitably add complexity to the framework.

Controlling the Movement of a Robot with Legs

In this article by Richard Grimmett , author of the book  Raspberry Pi Robotics Projects - Second Edition , we will add the ability to move the entire project using legs. In this article, you will be introduced to some of the basics of servo motors and to using Raspberry Pi to control the speed and direction of your legged platform. Even though you've learned to make your robot mobile by adding wheels or tracks, these platforms will only work well on smooth, flat surfaces. Often, you'll want your robot to work in environments where the path is not smooth or flat; perhaps, you'll even want your robot to go upstairs or over other barriers. In this article, you'll learn how to attach your board, both mechanically and electrically, to a platform with legs so that your projects can be mobile in many more environments. Robots that can walk! What could be more amazing than this? In this article, we will cover the following topics: Connecting Raspberry Pi to a two-legged mobile platform using a servo motor controller Creating a program in Linux so that you can control the movement of the two-legged mobile platform Making your robot truly mobile by adding voice control

Advanced Playbooks

In this article by the author, Daniel Hall , of the book, Ansible Configuration Management - Second Edition , we learn to start digging a bit deeper into playbooks. We will be covering the following topics: External data lookups Storing results Processing data Debugging playboks

Resource Manager on CentOS 6

In this article is written by Mitja Resman , author of the book  CentOS High Availability , we will learn cluster resource management on CentOS 6 with the RGManager cluster resource manager. We will learn how and where to find the information you require about the cluster resources that are supported by RGManager, and all the details about cluster resource configuration. We will also learn how to add, delete, and reconfigure resources and services in your cluster. Then we will learn how to start, stop, and migrate resources from one cluster node to another. When we are done with this article, your cluster will be configured to run and provide end users with a service.

Integrating a D3.js visualization into a simple AngularJS application

In this article by Christoph Körner , author of the book  Data Visualization with D3 and AngularJS , we will apply the acquired knowledge to integrate a D3.js visualization into a simple AngularJS application. First, we will set up an AngularJS template that serves as a boilerplate for the examples and the application. We will see a typical directory structure for an AngularJS project and initialize a controller. Similar to the previous example, the controller will generate random data that we want to display in an autoupdating chart. Next, we will wrap D3.js in a factory and create a directive for the visualization. You will learn how to isolate the components from each other. We will create a simple AngularJS directive and write a custom compile function to create and update the chart.

Using Basic Projectiles

"Flying is learning how to throw yourself at the ground and miss."                                                                                              – Douglas Adams In this article by Michael Haungs , author of the book  Creative Greenfoot , we will create a simple game using basic movements in Greenfoot. Actors in creative Greenfoot applications, such as games and animations, often have movement that can best be described as being launched . For example, a soccer ball, bullet, laser, light ray, baseball, and firework are examples of this type of object. One common method of implementing this type of movement is to create a set of classes that model real-world physical properties (mass, velocity, acceleration, friction, and so on) and have game or simulation actors inherit from these classes. Some refer to this as creating a physics engine for your game or simulation. However, this course of action is complex and often overkill. There are often simple heuristics we can use to approximate realistic motion. This is the approach we will take here. In this article, you will learn about the basics of projectiles, how to make an object bounce, and a little about particle effects. We will apply what you learn to a small platform game that we will build up over the course of this article. Creating realistic flying objects is not simple, but we will cover this topic in a methodical, step-by-step approach, and when we are done, you will be able to populate your creative scenarios with a wide variety of flying, jumping, and launched objects. It's not as simple as Douglas Adams makes it sound in his quote, but nothing worth learning ever is.

Writing Simple Behaviors

In this article by Richard Sneyd , the author of Stencyl Essentials , we will learn about Stencyl's signature visual programming interface to create logic and interaction in our game. We create this logic using a WYSIWYG ( What You See Is What You Get ) block snapping interface. By the end of this article, you will have the Player Character whizzing down the screen, in pursuit of a zigzagging air balloon! Some of the things we will learn to do in this article are as follows: Create Actor Behaviors , and attach them to Actor Types . Add Events to our Behaviors . Use If blocks to create branching, conditional logic to handle various states within our game. Accept and react to input from the player. Apply physical forces to Actors in real-time. One of the great things about this visual approach to programming is that it largely removes the unpleasantness of dealing with syntax (the rules of the programming language), and the inevitable errors that come with it, when we're creating logic for our game. That frees us to focus on the things that matter most in our games: smooth, well wrought game mechanics and enjoyable, well crafted game-play.

Apache Solr and Big Data – integration with MongoDB

In this article by Hrishikesh Vijay Karambelkar , author of the book Scaling Big Data with Hadoop and Solr - Second Edition , we will go through Apache Solr and MongoDB together. In an enterprise, data is generated from all the software that is participating in day-to-day operations. This data has different formats, and bringing in this data for big-data processing requires a storage system that is flexible enough to accommodate a data with varying data models. A NoSQL database, by its design, is best suited for this kind of storage requirements. One of the primary objectives of NoSQL is horizontal scaling, that is, the P in CAP theorem, but this works at the cost of sacrificing Consistency or Availability. Visit to understand more about CAP theorem

Working with Data in Forms

In this article by Mindaugas Pocius , the author of Microsoft Dynamics AX 2012 R3 Development Cookbook , explains about data organization in the forms. We will cover the following recipes: Using a number sequence handler Creating a custom filter control Creating a custom instant search filter

Auto updating child records in Process Builder

In this article by Rakesh Gupta , the author of the book Learning Salesforce Visual Workflow , we will discuss how to auto update child records using Process Builder of Salesforce. There are several business use cases where a customer wants to update child records based on some criteria, for example, auto-updating all related Opportunity to Closed-Lost if an account is updated to Inactive . To achieve these types of business requirements, you can use the Apex trigger. You can also achieve these types of requirements using the following methods: Process Builder A combination of Flow and Process Builder A combination of Flow and Inline Visualforce page on the account detail page

Writing a Fully Native Application

In this article written by Sylvain Ratabouil , author of Android NDK Beginner`s Guide - Second Edition , we have breached Android NDK's surface using JNI. But there is much more to find inside! The NDK includes its own set of specific features, one of them being Native Activities . Native activities allow creating applications based only on native code, without a single line of Java. No more JNI! No more references! No more Java!

Installation and Upgrade

In this article by Robert Hedblom , author of the book  Microsoft System Center Data Protection Manager Cookbook , we will cover the installation and upgrade for SQL Server on DPM server. We will also understand the prerequisites to start your upgrade process. You will learn how to: Install a SQL Server locally on the DPM server Prepare a remote SQL Server for DPMDB

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