Principal component analysis (PCA) is a statistical technique for dimension reduction often used in clustering or factor analysis. Given any number of explanatory or causal variables, PCA ranks the variables by their ability to explain greatest variation in the data. It is this property that allows PCA to be used for dimension reduction, i.e. to identify the most important variables from amongst a large set possible influences.

UIAlertView, a class contained in Apple's UIKit framework, was used to display an alert to the user. Alerts could have a title, message, several buttons, and custom subviews. UIAlertView was deprecated in iOS 8.

For questions related to pattern matching, using character sequences or tree structures. In contrast to pattern recognition, the match described here usually has to be exact.

A route more direct than the one ordinarily taken. A method or means of doing something more directly and quickly than and often not so thoroughly as by ordinary procedure.

ERB is a simple templating system for Ruby, embedding code in any plain-text document. It is often used for HTML generation in web frameworks (such as Ruby on Rails).

Microsoft ActiveX Data Objects (ADO) is a COM based package for accessing databases such as SQL Server or data sources such as Excel spreadsheets. ADO.NET provides improvements over ADO along with integration with the .NET Framework for .NET developers. ADO.NET tag should be used for ADO.NET specific questions.

The O/S in which a process is executed, especially settings that affect the process

VLC is a free and open source cross-platform multimedia player and framework that plays most multimedia files as well as DVD, Audio CD, VCD, and various streaming protocols. Use this tag only for programming-related questions about VLC.

Dynamic SQL is a technique using SQL (Structured Query Language) whose main difference from traditional SQL is that Dynamic SQL allows to build SQL statements dynamically at runtime, which eases the automatic generation and execution of program statements.

Issues related to the use of a 64-bit vs a 32-bit architecture including portability issues.

CLion is a cross-platform IDE for C and C++ development.