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:
× 749
Questions on the analytic and numeric equation solving functions of Mathematica (Solve, Reduce, NSolve, FindRoot, DSolve, RSolve, etc.).
× 2
Questions seeking help understanding error messages and fixing errors.
× 131
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.
× 14
× 9 × 355
Questions about how Mathematica evaluates expressions, tracing evaluation (Trace*), handling expressions in unevaluated form (Hold*, Unevaluated), nonstandard evaluation, etc.
× 31
Questions asking for an example to be provided, or asking for help understanding examples.
× 53
For questions about importing from or exporting to Microsoft Excel sheets, and interfacing to Microsoft Excel using COM or other methods.
× 2
× 4 × 375
Questions on converting data, graphics, sound etc. from Mathematica into other file formats.
× 10 × 94
How to manipulate expressions structurally, not necessarily complying with the rules of algebra.
× 25
Questions about Mathematica's predicate functions.
× 17
Questions on calling external executables, not necessarily through MathLink.
× 25 × 79
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.
× 2
× 18
× 29
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…
× 38
Questions on the financial functions of Mathematica.
× 11 × 3
× 215
Questions on the use of Mathematica to construct models for approximating empirical data.
× 7 × 3 × 59
Questions relating to different typefaces and their use in various Mathematica outputs, including graphics, notebooks and exported output.
× 235
Questions on typesetting and making your expressions, matrices, operators, equations or formulae look how you want them to.
× 7
Questions about interfacing Mathematica and Fortran. This also includes conversion of Fortran style numbers to Mathematica style.
× 74
Questions on the discrete and continuous Fourier analysis functions of Mathematica, as well as the FourierSeries` package.
× 12 × 13