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.

Type to find tags:
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Questions on testing and computing prime numbers.
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Version-specific issues for Mathematica 7 (other than bugs).
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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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The visual art or other aesthetic results generated by Mathematica.
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Questions on position tracking, especially using Mathematica coordinate tracking functions and control objects such as Locator, LocatorPane, and ClickPane.
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the underlying representation of two-dimensional forms in notebooks.
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Questions about using CUDALink, Mathematica's method to accelerate programs using NVidia graphics cards.
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Questions on changing Mathematica expressions of one type or format to another, for example date formats, Boxes and other typesetting representations, or different units of measurements.
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Tags for questions about convolution, including the Mathematica functions Convolve, DiscreteConvolve, ListConvolve, DirichletConvolve, ImageConvolve, and convolutions using Fourier, FourierTransform, …
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Options, methods or issues launching a Kernel instance
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a notebook with a collection of controls such as buttons. They can be used to perform many actions in Mathematica, including entering typesetting characters, styling noteb…
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for requests for books, online resources, etc. that deal with the Mathematica system and its applications. This tag is also for asking references for algorithms used within Mathematica.
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Questions on the use of Mathematica to capture data from external sources.
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Questions on the use of Mathematica to analyze, design, and simulate continuous- and discrete-time control systems.
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Questions about Mathematica's predicate functions.
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Questions specific to the Wolfram Cloud products.
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For questions about the data structures known as trees.
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Questions about stochastic calculus in Mathematica, for example how to use ItoProcess and RandomFunction.
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Questions on applying common nonlinear scalings to functions or data--useful for making sense of data which varies over a large range.
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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 on the arbitrary precision capabilities of Mathematica.
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Questions on calling external executables, not necessarily through MathLink.
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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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A source of input or output: files and pipes are both examples of general Mathematica objects known as streams.
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Questions on attributes of functions.
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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.