Questions tagged [undocumented]
Questions on undocumented functionality of Mathematica. Note that such functions might be subject to change without notice in future versions.
328
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1
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Question about System`MeijerGDump`* [closed]
Steps
Start a fresh kernel, then copy the below sentence, run it.
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- 1,571
11
votes
2
answers
223
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Which functions use a given option?
I occasionally discover Options which look like they might be useful, if only I knew which functions used that option. Is there a resource that lists all the functions which use a given option? What ...
- 431
4
votes
1
answer
118
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How to remove only circular refs in Language`ExpressionStore
Expressions are not garbage collected if there are references to them stored in the expression store. I use the following internal functions:
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- 700
5
votes
1
answer
81
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Undocumented behavior of Fold for arbitrary heads [closed]
Edit: I'm apparently blind. Sorry! And thanks to those who answered anyway.
Apologies in advance if this is sort of a nitpicky question, but I'm generally very paranoid that I don't fully understand ...
- 111
5
votes
1
answer
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What is computed by LinearAlgebra`Private`MatrixConditionNumber?
The following returns 51/7, even though the condition number is actually 9. I'm curious, what does 51/7 correspond to for this matrix?
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3
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60
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3
votes
2
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204
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Meaning of arguments in FittedModels`ParameterEllipsoid
I am trying to figure out what FittedModels`ParameterEllipsoid's parameters mean (I want to construct a filled ellipse)
Here is a minimum working example:
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- 4,615
1
vote
3
answers
112
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Why does assuming f[_] > 0 does not work while Element[f[_], Reals] does?
Refine works with symbols in either way:
Refine[Sqrt[x^2], Element[x, Reals]]
(* Abs[x] *)
Refine[Sqrt[x^2], x > 0]
(* x *)
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- 131
2
votes
0
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What are the (potential) uses of those utility functions in the context GroupTheory`Tools`?
This old answer briefly described the usages of
GroupTheory`Tools`Multisets,
GroupTheory`Tools`MultiSubsets,
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- 505
5
votes
2
answers
70
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Where is the new System`ConvertersDump`$extensionMappings?
I used to find the extensions mapping from System`ConvertersDump`$extensionMappings, which gives a mapping like "{"*.3ds" -> "3DS"...}&...
- 273
6
votes
2
answers
233
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Graphics`Mesh`FindIntersections not working in Mathematica 13.3
I just updated my Mathematica for Windows to 13.3 and when I tried to use the "Graphics MeshFindIntersections" command it doesn't seem to work. Have they replaced it with some other command ...
- 2,433
3
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0
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41
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What's the effect of SyntaxForm option in StandardForm boxes of Superscript?
Consider the following sample:
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- 67k
2
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47
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How do I identify which external routine is potentially internally used when executing some built-in function?
Wolfram's website declares that "a large fraction of Mathematica's numerical algorithms are based on original research at Wolfram Research" (cf. So Many Original Wolfram Algorithms). So, ...
- 505
2
votes
0
answers
93
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How to obtain documentation on functions inside some of the packages that are automatically loaded by Mathematica?
Mathematica comes with lots of useful functions which seems not to be documented. At least I do not know how to find the API documentation to learn more about these functions and how to use them.
<...
- 147k
5
votes
1
answer
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Custom Graphics primitives can't work with parallel Rasterize
I tried to create Graphics primitives using the techniques in this, found problems with parallel rasterization
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- 5,652