A tag is a keyword or label that categorizes your question with other, similar questions. Using the right tags makes it easier for others to find and answer your question.

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Questions on the basic structure of the Mathematica language (Wolfram language) including atomic data types, syntax etc
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Questions on counting subparts of expressions, based on certain criteria. This is to be used with primary tags such as list-manipulation or string-manipulation, with the primary tag indicating the spe…
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indicate that a question presents code or methods that may lead to a crash. Useful as a warning to prevent other users from experiencing the same without having saved their work.
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Questions regarding Mathematica cryptography related functionality (introduced in Mathematica 10).
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Questions on Mathematica parsing and interaction with CSS (cascading style sheet) language used for describing the look and formatting of a document written in a markup language.
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Questions about the Text based file format CSV (Comma Seperated Values). Questions include, but are not restricted to, importing from and exporting to this file format.
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Questions about using CUDALink, Mathematica's method to accelerate programs using NVidia graphics cards.
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Since version 7, Mathematica includes gigabytes of curated data relevant to many different fields, including physics, chemistry, graph theory, finance, geography and many more.
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Customizing interaction, the front end, or other aspects of Mathematica manually or programmatically.
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for questions about creating and using custom notations. For help on the use of the built-in operators, see syntax.
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Questions on systematic data handling and analysis, including data correction, manipulation, or selection of user-data or built-in data available with Mathematica.
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Questions on the use of Mathematica to capture data from external sources.
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a toolkit for working with SQL databases built into Mathematica.
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Specific forms of data storage and file types external to Mathematica.
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Questions on the Dataset data type and related functionality introduced in version 10. Do not use for questions on data in more generic list format or data-manipulation questions generally.
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Questions on using or implementing more or less common data structures such as linked lists, structs, trees, tries, heaps etc. in Mathematica.
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Mathematica pseudo-types Integer, Real, Rational, Complex, String and Symbol, and their use.
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Questions about Mathematica's date and time functions.
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Questions about debugging techniques, using the built-in debugger, and/or the Wolfram Workbench debugger.
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Questions on using or viewing Wolfram Demonstrations, or on implementing functionality inspired by Demonstrations.
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the process during which a piece of Mathematica code is prepared for distribution or for the internet.
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special notebook windows of the Mathematica front end.