Questions on undocumented functionality of Mathematica. Note that such functions might be subject to change without notice in future versions.

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6
votes
3answers
114 views

What function superseded SpaceForm?

In older versions of Mathematica you could use SpaceForm to leave a certain amount of spaces when writing to a file. For example, if we have the following data: ...
1
vote
0answers
27 views

How do I prevent Root and RootSum from expanding over quadratic roots?

For quadratics, RootSum[a #^2 + b # + c &, Cos[#] &] Immediately turns into and also, ...
5
votes
0answers
52 views

What does the symbol Continuation do?

There is a symbol Continuation (residing in the System` context). There is no usage or documentation for this symbol. ...
3
votes
0answers
37 views

What are Package` context symbols for?

The Package` context contains the following: What is the use of these undocumented functions? I found a reference to these in ...
3
votes
1answer
70 views

Pareto optimal fronts using internal function?

Reading this question: How do I estimate the Pareto front in my multiobjective optimization problem? I found @Daniel Lichtbau's interesting answer. Yet I don't know how such an "internal function" ...
26
votes
1answer
525 views

In 10.1.0 BenchmarkPlot doesn't work?

Bug introduced in 10.1 This bug was resolved in 10.2.0, but another bug was introduced in 10.3.0 persisting through 10.3.1 and finally resolved in 10.4 In Mathematica 10.1.0 and 10.3.0 ...
32
votes
4answers
761 views

Any ideas on how to use the Region` context?

If you type ?Region`* you'll get: which seems a bunch of interesting and not documented symbols. Any idea (or experience) on how to use them? Edit By ...
28
votes
3answers
947 views

Is using undocumented functionality a Bad Idea™?

Mathematica has a lot of very useful undocumented features. For example a hash table, a built-in list of compilable functions, additional options to CurrentValue, ...
5
votes
0answers
55 views

How to use the symbols in System`Private`? [duplicate]

Looking at Names["SystemPrivate*"] gives: I'd really like to use and look at the code for some of these symbols, e.g. ...
5
votes
3answers
243 views

Is there a build-in function converting a quantity to one with mixed units (such as feet and inches)?

For example, I want to convert 179 centimeters into 5 feet and 10.4724 inches instead of 70.4724 inches (as this website did). Maybe in the future I would need to convert days to {years, months, days} ...
31
votes
4answers
797 views

Undocumented form for FilledCurve[]

New in Mathematica 8 is FilledCurve (and its cousin JoinedCurve). The docs state that this function can take a list of segments ...
10
votes
1answer
109 views

What are the main differences between RawArray and PackedArray?

What I know: PackedArray is documented (to some extent) in "Developer Utilities Package", RawArray is just mentioned in ...
1
vote
0answers
57 views

Uploading sketch to Arduino from Mathematica

Since the device drivers for Arduino used by DeviceExecute have very poor performance for writing and receiving serial data to/from Arduino compared with the device ...
11
votes
2answers
122 views

What's in a ValueList?

I discovered a command System`Private`ValueList in my .mx dumps. It's an internal command and thus undocumented, but from the ...
18
votes
1answer
292 views

What pseudo-random number generators are available to Mathematica users?

One would think I should be able answer the question I pose in the title for myself by reading the Documentation Center article ref/SeedRandom, but it's not so simple. That article does give a list ...
2
votes
1answer
40 views

Certainty of the New Vertex Name after using EdgeContract

It appears that when I use EdgeContract on an undirected graph, the vertex that is the result of contracting an edge is always named the smaller of the two ...
6
votes
1answer
60 views

Configurable tolerance for numerical equality?

In standard C++ the double values for 1. + 1.2*^-16 and 1. are not considered equal. But in Mathematica, I get the following: ...
24
votes
1answer
710 views

How to work with Experimental`NumericalFunction?

This question is intimately connected with previous one: "How to create internally optimized expression for computing with high WorkingPrecision?" Oleksandr R. correctly states in the comment: A ...
6
votes
1answer
102 views

How does Internal`PolynomialFunctionQ work?

I found that Internal`PolynomialFunctionQ performs much better than PolynomialQ. Here is a huge random polynomial in 12 ...
109
votes
12answers
6k views

What are some useful, undocumented Mathematica functions?

There have already been some questions about some undocumented functionality in Mathematica. Such as (please add to these lists!) How can one find undocumented options or option values in ...
10
votes
2answers
261 views

Is there a method to enumerate the keys/values of System`Utilities`HashTable

Lacking from the simple API of System`Utilities`HashTable is a method to enumerate the keys/values. ...
31
votes
5answers
1k views

What is the complete list of valid Front End Tokens?

What is the complete list of valid Front End Tokens? Preferably, by version number. Keywords: FrontEndToken, ...
21
votes
0answers
336 views

Graphics`Mesh`FindIntersections[ ] fails to detect intersections

Graphics`Mesh`FindIntersections[ ] is an undocumented function for, well, detecting intersections very efficiently. Take a look: ...
3
votes
0answers
76 views

LibraryLink: Asynchronous Examples

Inside the directory structure of LibraryLink there are several example files. Basically, they are divided in two types: Synchronous: demo.c, demo_error.c, ...
15
votes
1answer
264 views

Why is SatisfiabilityCount faster than SatisfiableQ?

Consider the following (large) Boolean expression, which arose in a SAT problem. (The expression is not satisfiable.) ...
17
votes
0answers
133 views

V10's TypeSystem - what are these function useful for? [closed]

The symbols in the TypeSystem` context are clearly used for working with Datasets, but they seem powerful. I was hoping that someone could help explain how they work and is they are useful for ...
7
votes
1answer
111 views

Ways to obtain a BoxObject

Is there any way to get a BoxObject, except with EvaluationBox or ParentBox? So usually one ...
9
votes
1answer
203 views

What is FrontEnd`AttachedCell?

Perhaps it's not accessible from the front end, but what is this so-called attached cell? ...
20
votes
2answers
342 views

How to know the usage of undocumented function like LinearAlgebra`BLAS?

BLAS is not documented in mathematica. Using ?LinearAlgebra`BLAS`* gives But None of the function has a detailed usage information Click any of the ...
7
votes
3answers
134 views

How can I know if a pattern corresponds to a string pattern?

What would be the best way to detect if a pattern corresponds to a string pattern ? An invalid string pattern p would lead to an error in ...
8
votes
1answer
428 views

How to use Undocumented Functions Prism, Tetrahedron and Hexahedron

Taking a look at this question and this one, I checked to see if Mathematica really does not have a Prism primitive. To my surprise the function ...
4
votes
0answers
146 views

strange timing result of LinearAlgebra`BLAS` in mathematica? [closed]

BLAS is short for "Basic Linear Algebra Subprograms". It is a famous collection of routines for doing linear algebra. I just know from Oleksandr R. that mma can directly call BLAS under the context ...
4
votes
0answers
79 views

“ClosingActions” option for FrontEnd`AttachCell [duplicate]

I'm looking to find the possible values for the ClosingActions options FrontEndAttachCell. I have found ...
123
votes
6answers
5k views

How can one find undocumented options or option values in Mathematica?

Mathematica has a lot of undocumented or poorly documented options. How does one go about working out if there is an undocumented option that might solve a particular problem? How does one work out ...
1
vote
0answers
42 views

Documentation for undocumented symbols RandomMatrix and SharingList?

In version 10.2, there are symbols Random`RandomMatrix and System`SharingList. I tried some experiments of my own, but could ...
9
votes
0answers
77 views

Is “MaxMessageCount” broken or is its function counter-intuitive?

Behavior remains unchanged through Mathematica version 10.1.0 As noted by kguler the Front End option: MessageOptions -> "MaxMessageCount" does not appear to ...
10
votes
1answer
266 views

TableView displays negative numbers incorrectly

I'm trying to substitute TableForm with TableView because TableView is more handy with big data . But on my Mathematica 9.0.1 (ubuntu 14.04_64bit) there is a problem with negative numbers: ...
16
votes
1answer
201 views

Undocumented fourth parameter of Collect; how long has it been there?

While tinkering with How to get a list of monomials of a polynomial without coefficients? on a whim I tried a fourth argument in Collect and found: ...
2
votes
0answers
71 views

Undocumented function SumOfSquaresReps

There is an interesting (and documented) number-theoretic function in MMA called PowersRepresentations[$n$, $k$, $p$]. It gives the distinct representations of the integer $n$ as a sum of $k$ ...
2
votes
1answer
116 views

What Method values are available for Plot?

The Documentation Center article on Plot notes under Details and Options that Method is one of the options for ...
15
votes
1answer
295 views

What Method options does FindInstance accept?

While answering Trouble getting FindInstance to return multiple results for certain constraints it became clear that for this problem FindInstance would be better ...
11
votes
2answers
214 views

What will happen if I set ExclusionsStyle for points in 2D plot?

For example f[x_] := (x^5 - 4 x^2 + 1)/(x - 1/2); Plot[f[x], {x, -1, 2}, Exclusions -> {f[x] == 0}, ExclusionsStyle -> Dashed] Has the ...
10
votes
1answer
177 views

Enigmatic message about MaxBend

Referring to the method I proposed for Problem with ParametricPlot Mathematica 10.0.2 throws an enigmatic error message: ...
26
votes
2answers
882 views

Specifying non-conflicting PlotTheme options

A bug or limitation in 10.0.0 affects a few of these examples; it was resolved in 10.1.0. I am trying out Mathematica 10 on https://programming.wolframcloud.com. ...
11
votes
2answers
201 views

Why is a symbol still found after changing its context?

It seems that we can change the context of symbols: In[1]:= x = 1 Out[1]= 1 In[2]:= Context[x] = "foo`"; But then x is still ...
38
votes
6answers
1k views

Items known by CurrentValue

CurrentValue can be used to poll the state of numerous system values such as the mouse position. Its help page doesn't list all possible items, though. An item like ...
13
votes
1answer
145 views

How to retrieve current FaceForm?

The current colour in a Graphics object can be retrieved using CurrentValue["Color"] for use in Dynamic stuff. Example: ...
5
votes
1answer
81 views

Can Someone Please Explain Internal`$SameQTolerance?

If I input Internal`$SameQTolerance (* output = 0.30103 *) which is the approximation of Log[10,2], or ...
15
votes
1answer
387 views

What is the complete list of valid FrontEnd Packet types?

In response to my question How can I get the unchanged Box form of an arbitrary expression? John Fultz answered with a method using the hilariously named ...