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 color models, schemes, named colors and color functions supported by Mathematica.
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Questions on parallel computing in Mathematica.
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self-contained bundles of Mathematica code that add new functions and other functionality.
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Questions about random number generation and the properties of numbers so generated.
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Questions on the interpolation functions in Mathematica (Interpolation[], ListInterpolation[], FunctionInterpolation[], InterpolatingPolynomial[], etc.)
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Tag for questions about bitmapped graphics, particularly those using the Image function.
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Questions about the generation and use of compiled functions using Compile.
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Questions on the functionality operating on polynomials
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Questions about performing probabilistic calculations, especially those concerned with the Mathematica commands Probability, Expectation and the various functions related to distributions such as Norm…
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Version-specific issues for Mathematica 10
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Questions dealing with optional named arguments of Mathematica functions.
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For questions on interpreting existing error messages that you have encountered, as well as writing and managing messages, assertions and checks for your own functions.
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Questions about using complex numbers in Mathematica. This includes basic arithmetic, functions of complex numbers, plotting complex functions, and dealing with branch cuts.
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Questions on assigning and unassigning definitions to names that represent them, including issues raised by context and localization. Use tag [assignment] for issues relating to Set versus SetDelayed.
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For questions about defining recursive functions, recursive algorithms and solving recursive equations.
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Questions on legends, figures (usually insets) that indicate what those lines/bars/points in plots refer to, using arrangements of graphic elements and text, whether manually or using built-in functio…
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Questions on constructing graphical objects using relatively complex computations relating to the mathematical structures defining those objects. Examples include convex hulls, mathematical constructi…
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Questions on Mathematica's ability to create "moving pictures" from its graphical output, including exporting these animations to other formats.
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Questions on dealing with series data and constructing power series expansions of functions.
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For questions about distributions built-in in Mathematica, and functions that operate on them. Also includes questions about defining your own distributions.
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Questions about Mathematica's functional programming style, including the use of pure functions (Function[], #, &) and functions such as Map, Apply, Nest, and Through.
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Questions on Mathematica's scoping constructs (Block, Module, With, etc.)
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Mathematical vectors, operations on vectors and vectorized programming.
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Version-specific issues for Mathematica 9
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a sequence of well-defined steps that defines in abstract the solution to a problem.
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Questions about optimizing code for faster results, or how to do faster computations.
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The art of manipulating an algebraic expression into the desired form.
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How to manipulate expressions structurally, not necessarily complying with the rules of algebra.
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the study of the visual representation of data, meaning "information that has been abstracted in some schematic form, including attributes or variables for the units of informati…
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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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Questions on obtaining files and directory structure/information and manipulating the said structure/information, searching/renaming particular files in a directory, etc., in an OS independent manner.
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Questions on the Computable Document Format (CDF) that allows Mathematica notebooks to be embedded within media for easy viewing and manipulation. Do not use this tag for questions on cumulative distr…