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 related to the application of Mathematica to problems in physics.
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Questions about RAM usage, including optimizing memory use, avoiding and fixing leaks and releasing unused memory.
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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 Mathematica's date and time functions.
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Questions on filtering or selecting data based on certain criteria. This is to be used with primary tags such as list-manipulation, string-manipulation or signal-processing, with the primary tag indic…
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Questions about explicit functions expressed in terms of independent variables, i.e. parameters. Including approaches for rewriting functions using different parameterizations.
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Version-specific issues for Mathematica 10 (other than bugs).
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GUI-construction involves everything that is used to programmatically construct a custom graphical user interface under Mathematica.
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the back-end application thread that does the actual evaluation of all non-graphical expressions. It can be accessed directly through the console but is more commonly working behind the…
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Questions on the use of Mathematica in combinatorics, including the Combinatorica add-on package.
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Questions dealing with the relative uncertainty in the values computed, stored, or manipulated by Mathematica.
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Questions related to displaying identifiable labels in graphics or any other expressions, such as in AxesLabel and Labeled. Not to be confused with Goto-Label.
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Questions about the function Assuming[], the $Assumptions system variable, and the Assumptions option of functions such as Simplify[] and Integrate[].
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Questions about producing vertically and horizontally aligned output.
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Questions on the use and creation of meshes including the use of MeshRegion, ElementMesh, and TetGenLink.
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a suite of Mathematica functions that implement a protocol for the communication/interfacing of Mathematica with external programs.
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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…
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Questions about Mathematica arrays, or implementing array data-type functionality, i.e, collections of regular dimensions containing elements that can be accessed by standard (computable) indices.
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Questions about applying functions or operators to expressions, especially constructs that take advantage of Map (/@) functionality.
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Questions on the number-theoretic functionality of Mathematica.
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For questions regarding the underlying implementation of built-in functions.
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Tag for questions about building histograms in Mathematica. Apart from generating the graphics, and prettifying them, this also includes methods to extract their data.
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Styles define how Mathematica notebooks, cells and expressions are formatted, displayed, evaluated and interacted with.
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Version-specific issues for Mathematica 9 (other than bugs).
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Questions relating to working with textual information: textual analysis, data mining, etc.
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Questions on trigonometric and hyperbolic functions, as well as their inverses, in Mathematica.
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intended for the review and improvement of style for already functioning code. It not meant to change the objective of the code.
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the ultimate atoms of symbolic data. Every symbol has a unique name, exists in a certain Mathematica context or namespace, and can have a variety of types of values and attribu…
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Questions on the sorting/ordering functions of Mathematica (Sort, SortBy, Ordering, etc.).
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Questions relating to the importing, exporting, and extraction of data from PDF files
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Questions about cells and functionality related to cell structures, or the notebook cell hierachy which serves to organize the information in a Mathematica notebooks. This includes questions related t…
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Questions about making your own documentation similar to the built-in documentation style. Also about finding things in the documentation, working with the documentation, errors in the documentation, …
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For questions on interfacing or getting Mathematica to work together with other software or technologies.
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Questions about the Piecewise function, which is represented by different expressions for different ranges of values of its independent variable.
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Questions about using, converting, or interpreting units of measurement in Mathematica.
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Tag for the usage of "FiniteElement" Method embedded in NDSolve and implementation of finite element method (fem) in mathematica.