Questions tagged [undocumented]

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

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InfinitePlane documantation [closed]

I've a 3D plot Plot3D[f[x, y], {x, -10, 10}, {y, -10, 10}, PlotRange -> 10, ClippingStyle -> None, ImageSize -> Medium] And I want a 2D plan in the graph ...
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112 views

A Curiosity: What is DispatchQ?

As shown below, my autofill in Mathematica showed an interesting function: DispatchQ. Yet, it does not appear in the Mathematica Documentation Center, a search for ...
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Why are some symbols recognized by Mathematica but nowhere in the documentation? [duplicate]

I was trying to calculate a Groebner basis for a given set of polynomials, and I did it successfully. But I wanted to calculate the conversion matrix between the original basis and the Groebner basis....
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1answer
89 views

Implicit Riccati Equation Solver (to find the anti-stabilizing solution)

I've found that the latest MATLAB icare() solver includes the possibility to find also the anti-stabilizing solution of the Riccati equation. I haven't found a ...
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58 views

What does the PerformanceGoal option of FindMinimum do?

FindFit and FindMinimum both have a PerformanceGoal option. It is not documented. What does ...
4
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1answer
96 views

In search of lost time: Mathematica keyboard shortcuts

I am wondering about all the shortcuts that there are in Mma, besides the documented ones in https://reference.wolfram.com/language/tutorial/KeyboardShortcutListing.html. Are there any undocumented ...
7
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1answer
112 views

Is AlgebraicRulesData magical?

I am trying to understand what AlgebraicRules is all about in the answer to this question. It apparently returns an ...
14
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1answer
196 views

What does Reduce`FreeVariables really do? And can we rely on it?

Very frequently, in answers on this site, the undocumented function Reduce`FreeVariables comes up in the context of generating a list of variables inside an ...
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82 views

How to make my custom neural layer only apply noise during training (similar to how DropoutLayer behaves)?

Utilizing some undocumented Mathematica functionality, I implemented it like this: ...
5
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1answer
129 views

How to author a workflow?

I find the workflow refpages in the doc center very helpful, and I'd like to make some of my own: Workflows seem to be notebooks of "Text" and ...
4
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1answer
82 views

Is it possible to get current thickness for every Line, Polygon, Circle object in a plot?

When exporting Mathematica graphics to raster formats with high resolution the common problem is that thickness for such objects as Line, ...
15
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1answer
132 views

Why does setting SyntaxInformation add a definition to DefaultValues

Before setting any definitions to the symbol f, the DefaultValues of f is empty: ...
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1answer
52 views

How to extend the DefaultDuration of Manipulate[] when it has Bookmarks?

How to extend the DefaultDuration of Manipulate[x,{x,0,1},Bookmarks->{"beginning":>(x=0),"end":>(x=1)}] to 20 ...
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1answer
104 views

Is it possible to make listable Experimental`NumericalFunction?

I have been playing a bit with the undocumented function Experimental`CreateNumericalFunction and I wanted to know if somebody found a way to make generated ...
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127 views

Status of Streaming package

I see the Streaming package mentioned in this question How to use Streaming package in v11.1? with advice on getting it working in V11.1. I've failed to get either the built-in version or the patch ...
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1answer
105 views

Problem with “MediaTools`” in Mathematica 12

I asked here for a solution how single video images can be extracted very fast from avi files. Piotr Wendykier gave a solution for Mathematica 11.3. Now I'm using Mathematica 12 and his solution ...
3
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1answer
62 views

TemporalDiscretization in MethodOfLines

When solving ODE's one can use options like MaxStepFraction to control the number of grid points. When solving PDE's ...
6
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1answer
83 views

How to vectorize this nonlinear ODE system for NDSolve?

I learned a long time ago that NDSolve can often be sped up by vectorizing systems of equations. I've got a problem now that seems ideal for this approach, but I ...
3
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1answer
120 views

Implementing the Peano-Baker Series with Mathematica

I would like to calculate the Peano-Baker series with mathematica, namely an integral expansion to approximate the state transition matrix: Say I have a matrix $A(t)$ and I want to calculate: $\Phi(...
8
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1answer
111 views

Can we construct our own NDSolve`StateData?

NDSolve can be broken into three stages: NDSolve`ProcessEquations processes the equations and sets up an NDSolve`StateData ...
13
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1answer
160 views

Can't make more than 249 Internal`Bags in a Table

I need a lot of Internal`Bags so I made them with Table. It works fine for 249 or fewer Bags...
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114 views

How to modify NDSolve`StateData without crashing the kernel?

Probably a hard question, but it's better to cry out loud. Reminded by Chris K, I noticed my fix function has been broken since v11.3. After some checking, I ...
5
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1answer
76 views

MatrixConditionNumber does not work in version 12.0

A = {{1., 0.}, {0., 2.}}; LinearAlgebra`MatrixConditionNumber[A]
3
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1answer
222 views

What is the most reliable way to find a particular function?

I learned there're built-in functions which is not documented from this question. After this , I tried looking for something which is usable for me,then noticed that with ...
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104 views

Reverse Engineering of MMA `Classify[]` Output?

Update: as @AntonAntoniv rightly noticed in his comment the case of DecisionTree is already discussed. Now it would be great to also have an equivalent answer for LogisticRegression. MMA is really ...
7
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1answer
48 views

Can I reimplement something like TogglerBox?

As a purely academic exercise can I make a box structure that'll toggle between two views when clicked and that doesn't ever depend on Dynamic or ...
5
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1answer
101 views

How to not show line mesh elements

Let's say I make a mesh from a collection of random points: SeedRandom[1234] points = RandomReal[1, {20, 2}]; mesh = VoronoiMesh[points] For the purposes of my ...
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70 views

Evaluating Internal`$VideoEncodings gives a strange message

When calling Internal`$VideoEncodings to check available video codecs on my pc, Mathematica_11.3 gives a message: ...
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44 views

Why does the kernel strip \< and \> from strings [duplicate]

The FE always passes strings to the kernel that look like: "\"\<asdasd\>\"" And the \< and > get pruned out. We can simulate this for ourselves with: <...
5
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1answer
124 views

How can I see all FE nine-patch bitmaps?

The FE stores a bunch of little nine-patch images in the layout that govern the appearance of much of Mathematica. These things are incredibly useful to have as they may be used to give a clean ...
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43 views

Second argument Run[]

Run officially takes only one argument. I encountered code with Run[command, "Text"], is this a mistake or is the second argument meaningful? If so what does it do? ...
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34 views

Method option of function MatrixRank

By running ??MatrixRank, I see that it has an optional argument named Method. However, this argument is not in the ...
5
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1answer
89 views

Making an Association-like interface for HashTable

System`Utilities`HashTable is conceptually a lot like an Association but it has the pretty phenomenal (for Mathematica) property ...
7
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1answer
68 views

Custom Property interface on my own objects

I know I can use the Property interface for things like Graph but I want to use it for all of my objects. This includes: ...
3
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1answer
75 views

Custom conversion rules in UnitConvert

I want to make UnitConvert operate on custom units with special rules. For instance, I would like to be able to convert between ...
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0answers
34 views

Create a ProcessObject for a process not made with StartProcess

I am launching and linking to Mathematica from an external process and would like to be able to create a ProcessObject for the launching process that will support <...
3
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0answers
47 views

How to make custom attached menubars? [duplicate]

I would like to understand how to build an attached menubar. For example, Image has the following bar - an attached cell that arises when clicked on: ...
4
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1answer
173 views

Others problems with Graphics`PolygonUtils`PolygonCombine

As a continuation of this question, writing: ...
8
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2answers
240 views

Problem with Graphics`PolygonUtils`PolygonCombine

Writing: Normal@ParametricPlot[{x, x^2 t}, {x, 0, 2}, {t, 0, 1}] /. p : {__Polygon} :> Graphics`PolygonUtils`PolygonCombine[p] I get: but if I write: ...
6
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1answer
138 views

Undocumented GraphComputation`GraphProduct usage

According to Mathworld there is an undocumented function GraphComputation`GraphProduct[G1, G2, "Cartesian"] To compute the cartesian graph product. Now in ...
4
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0answers
35 views

Get all built-in image files for styling buttons and panels

Mathematica makes use of nine-patch images in styling its resizable interfaces like Panel and Button. Nicer than remaking new ...
15
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1answer
341 views

What happened to SequenceLimit?

In older versions of Mathematica, there was a function called SequenceLimit that allowed taking the limit of a numerical sequence. It is useful for speeding up the ...
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90 views

Language`ExpressionStore and ParallelMap

Is there a way to access NewExpressionStore from within a parallelized calculation? I have tried variations of ...
7
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64 views

Special forms for autocompletion strings

Szabolcs has previously dug up a very useful tool to make custom autocompletions. Here's that in action: ...
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0answers
111 views

Implementing jacknife method

I need to use a jacknife method in order to find the standard deviation of my data. Howvere, I realise there's no built-in fuction (or maybe I couldn't find it), not even a general bootstrap method. ...
3
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1answer
91 views

Using OAuthClient to extend ServiceConnect service that requires authentication and POST

I want to extend the functionality of a service available via ServiceConnect, particularly Google Calendar to insert a new event. That action requieres ...
9
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1answer
176 views

How to defer creating/displaying boxes in front end until requested?

If the size of an output expression is larger than threshold ByteCount, the front end will display an abbreviated version of it by producing an ...
2
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1answer
66 views

How can I find all the plot themes for a given function?

Plot themes are useful little things that ease the pain of manually styling Mathematica graphics. I have a few favorites, "Web", ...
8
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1answer
120 views

Exclude inactived functions from DifferentiationOptions

The list of functions provided in SystemOptions["DifferentiationOptions" -> "ExcludedFunctions"] show which symbols will not be touched by ...
13
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1answer
188 views

How is the Hessian computed using ``Experimental`NumericalFunction``?

Here and here it was explained how to use Experimental`NumericalFunction to compute the Hessian of a numerical function. I would like to know how this undocumented ...

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