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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Tag for all questions about getting a connection to, setting up, or accessing a SQL database using Mathematica, particularly (but not restricted to) using Mathematica's DatabaseLink package.
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Specific forms of data storage and file types external to Mathematica.
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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 on calling external executables, not necessarily through MathLink.
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Tag for questions about using optional arguments in Mathematica functions.
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Options, methods or issues launching a Kernel instance
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Tag for questions about compatibility among various versions of Mathematica, and compatibility issues of Mathematica with various operating systems.
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special notebook windows of the Mathematica front end.
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Tag for the usage of "FiniteElement" Method embedded in NDSolve and implementation of finite element method (fem) in mathematica.
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Questions about machine-learning functionality of Mathematica, for instance involving, but not restricted to, `Predict`, `Classify`, `FindClusters` and the various regression functions.
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Abstract manipulation of symbols. Transforming an algebraic expression into the desired form.
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Questions concerning argument patterns used as formal arguments in function definitions (e.g., := expressions) to restrict the kinds of values that can be passed as actual arguments. Also questions ab…
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Questions about character encoding and decoding. This includes, but is not restricted to, conversion of characters to their numerical value in a character table and vice versa and conversion of charac…
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Questions on the group-theoretic functionality of Mathematica.
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For questions related to user defined caching mechanisms, memoization, in particular.
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For questions about texture mapping, particularly using the Texture function.
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Questions about looping or recursive structures that do not complete. Such structures include While, For, FixedPoint, and NestWhile. Also user defined functions that make recursive calls to themselves…
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About using and customizing the front-end's auto-completion feature
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Questions on the internal error messages of Mathematica.
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