Attractor. Visual representation of a strange attractor In the mathematical field of dynamical systems, an attractor is a set of numerical properties toward which a system tends to evolve, for a wide variety of starting conditions of the system.[1] System values that get close enough to the attractor values remain close even if slightly disturbed. A trajectory of the dynamical system in the attractor does not have to satisfy any special constraints except for remaining on the attractor, backward and forward in time. The trajectory may be periodic or chaotic. If a set of points is periodic or chaotic, but the flow in the neighborhood is away from the set, the set is not an attractor, but instead is called a repeller (or repellor).
Motivation[edit] A dynamical system is generally described by one or more differential or difference equations. Dynamical systems in the physical world tend to arise from dissipative systems: if it were not for some driving force, the motion would cease. Fixed point[edit] 140 Google Interview Questions | Impact Interview. SEE ALSO: Google PM interview class, Google Software Engineer interview class, Google Product Marketing interview class Here’s a list of 140 Google interview questions. Many of our clients have interviewed and received Google job offers. Contact us for a free 15 minute interview analysis before your Google interview. Link to Google interview questions for: Google Interview Questions: Product Marketing Manager Why do you want to join Google? Google Interview Questions: Product Manager How would you boost the GMail subscription base? Google Interview Questions: Software Engineer Why are manhole covers round? Struct foo { char a; char* b; Google Interview: Software Engineer in Test.
Magic number (programming) In computer programming, the term magic number has multiple meanings. It could refer to one or more of the following: A constant numerical or text value used to identify a file format or protocol; for files, see List of file signaturesDistinctive unique values that are unlikely to be mistaken for other meanings (e.g., Globally Unique Identifiers)Unique values with unexplained meaning or multiple occurrences which could (preferably) be replaced with named constants The format indicator type of magic number was first found in early Seventh Edition source code of the Unix operating system and, although it has lost its original meaning, the term magic number has become part of computer industry lexicon.
In Version Seven Unix, the header constant was not tested directly, but assigned to a variable labeled ux_mag[4] and subsequently referred to as the magic number. Magic numbers are common in programs across many operating systems. Some examples: Linking Custom Static Libraries from your Xcode Projects - RemObjects Wiki. Canonical Model. A canonical model is a design pattern used to communicate between different data formats. A form of enterprise application integration, it is intended to reduce costs and standardize on agreed data definitions associated with integrating business systems. A canonical model is any model that is canonical in nature, i.e. a model which is in the simplest form possible based on a standard, application integration (EAI) solution.
Most organizations also adopt a set of standards for message structure and content (message payload). The desire for consistent message payload results in the construction of an enterprise or business domain canonical model common view within a given context. Often the term canonical model is used interchangeably with integration strategy and often entails a move to a message-based integration methodology. See also[edit] External links[edit] APIs Console. Building a simple Android app. Albert Einstein: The Alpha geek and the inspiration for the application we’ll construct this chapter (inset).
In the previous master class we focused on installing the development environment and built a rather simple Hello World application. In this class we will focus on the Android conventions and construct a slightly more interesting application – one with images and buttons. The creators of Android have focused on developing forward-looking frameworks with a focus on ensuring developer productivity. They achieve this using a tested trick in software engineering – ‘conventions‘. When developers create applications they have to make a number of decisions including rather mundane ones like ‘where do I store my images?’ Android development framework favors a set of conventions and will wire up the application if we followed these.
Keeping the tools in shape Android SDK and the Eclipse IDE tend to release updates to add enhancement and fix defects. Figure 2: Android Project Structure. Android User Interface Design: Basic Image Controls. In this tutorial, you'll learn how to create basic Android image controls. Then you'll learn how to configure, style, and manipulate these controls in a variety of ways. This tutorial shows you the steps to create a number of different ImageView controls in your Android application. First, you learn how to add basic image controls to your layout files and what some of their most useful attributes are. Next, you learn how to set the image control’s contents in several different ways. Finally, we discuss some of the other features available to ImageView control in Android. The Android SDK includes a simple static text control for use within your layouts: ImageView (android.widget.ImageView). A good example of ImageView control usage would be to display an icon or graphic on the screen.
Here is an example of a screen with five different ImageView controls displayed on it. Step 1: Create an Android Application Begin by creating an Android project. Step 3: Sizing ImageView Controls Conclusion.