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List of file signatures. This is a list of file signatures, data used to identify or verify the content of a file. Such signatures are also known as magic numbers or Magic Bytes. Many file formats are not intended to be read as text. If such a file is accidentally viewed as a text file, its contents will be unintelligible.
The Internet Archive allows the public to upload and download digital material to its data cluster, but the bulk of its data is collected automatically by its web crawlers, which work to preserve as much of the public web as possible. Its web archive, the Wayback Machine, contains hundreds of billions of web captures.
- 169 (2019)
- 1996
- May 10, 1996; 27 years ago
- $36.7 million (2019)
Google Search (also known simply as Google or Google.com) is a search engine operated by Google. It allows users to search for information on the Internet by entering keywords or phrases. Google Search uses algorithms to analyze and rank websites based on their relevance to the search query. It is the most popular search engine worldwide.
The Shawshank Redemption is a 1994 American prison drama film written and directed by Frank Darabont, based on the 1982 Stephen King novella Rita Hayworth and Shawshank Redemption.The film tells the story of banker Andy Dufresne (Tim Robbins), who is sentenced to life in Shawshank State Penitentiary for the murders of his wife and her lover, despite his claims of innocence.
- History
- Packages
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- Commercial Support
- Examples
- See Also
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R was started by professors Ross Ihaka and Robert Gentleman as a programming language to teach introductory statistics at the University of Auckland. The language was inspired by the S programming language, with most S programs able to run unaltered in R. The language was also inspired by Scheme's lexical scoping, allowing for local variables. The ...
R packages are collections of functions, documentation, and data that expand R. For example, packages add report features such as RMarkdown, knitr and Sweave. Easy package installation and use have contributed to the language's adoption in data science. The Comprehensive R Archive Network (CRAN) was founded in 1997 by Kurt Hornik and Fritz Leisch t...
R comes installed with a command line console. Available for installation are various integrated development environments (IDE). IDEs for R include R.app (OSX/macOS only), Rattle GUI, R Commander, RKWard, RStudio, and Tinn-R. General purpose IDEs that support R include Eclipse via the StatET plugin and Visual Studio via R Tools for Visual Studio. E...
The R Core Team was founded in 1997 to maintain the R source code. The R Foundation for Statistical Computing was founded in April 2003 to provide financial support. The R Consortium is a Linux Foundation project to develop Rinfrastructure. The R Journal is an open access, academic journalwhich features short to medium-length articles on the use an...
The main R implementation is written primarily in C, Fortran, and R itself. Other implementations include: 1. pretty quick R (pqR), by Radford M. Neal, attempts to improve memory management. 2. Renjin is an implementation of R for the Java Virtual Machine. 3. CXXR and Riposte are implementations of R written in C++. 4. Oracle's FastR is an implemen...
Although R is an open-sourceproject, some companies provide commercial support: 1. Revolution Analyticsprovides commercial support for Revolution R. 2. Oracle provides commercial support for the Big Data Appliance, which integrates R into its other products. 3. IBM provides commercial support for in-Hadoopexecution of R.
Basic syntax
The following examples illustrate the basic syntax of the language and use of the command-line interface. (An expanded list of standard language features can be found in the R manual, "An Introduction to R".) In R, the generally preferred assignment operator is an arrow made from two characters <-, although =can be used in some cases.
Structure of a function
One of R's strengths is the ease of creating new functions.Objects in the function body remain local to the function, and any data type may be returned. Create a function: Usage output:
Modeling and plotting
The R language has built-in support for data modeling and graphics. The following example shows how R can generate and plot a linear model with residuals. Output:
The cat (Felis catus), commonly referred to as the domestic cat or house cat, is the only domesticated species in the family Felidae. Recent advances in archaeology and genetics have shown that the domestication of the cat occurred in the Near East around 7500 BC. It is commonly kept as a house pet and farm cat, but also ranges freely as a ...
Winston Churchill. Sir Winston Leonard Spencer Churchill [a] (30 November 1874 – 24 January 1965) was a British statesman, soldier, and writer who twice served as Prime Minister of the United Kingdom, from 1940 to 1945 during the Second World War, and again from 1951 to 1955. Apart from two years between 1922 and 1924, he was a Member of ...