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 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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a subspace of R^n with codimension 1, therefore n-1 coordinates are enough to represent any point on the simplex. A 2D simplex can be plotted as a ternary plot.
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Tag for questions on Optical Character Recognition (OCR), including the Mathematica function TextRecognize[].
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Tag for questions meant as a puzzle for the Mathematica.stackexchange.com public or about solving puzzles using Mathematica.
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For questions about persistence, i.e., storing variable values or function definitions beyond the lifetime of individual Mathematica sessions.
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for questions that came from the Project Euler website.
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For questions related to the effects of Mathematica's internal caching mechanisms.
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The utilization of advanced computing technology in mathematical research: new mathematical results discovered partly or entirely with the aid of computer-based tools.
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