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Mathematica : Recent Questions and Answers (Page 209)

Find answers to your questions about Mathematica or help others by answering their Mathematica questions.

How to rescale a given interpolationfunction, thereby keeping the original name?

For a given Blackbox interpolation function f[x] examplaryf = Interpolation[Table[{x, Cos[x]}, {x, 0, 2 Pi, 2 Pi/20}]] (*f[x]*)I would like to rescale the functioneps=0.9;fn=eps f[#/eps]&; (*fn[x]:= eps f[x/eps]*)which...

Asked on 12/22/2020

2 answer

Bug in NearestNeighborGraph

Bug introduced in 11.3 or earlier, Fixed in 12.2.0NearestNeighborGraph generates incorrectly formatted output on rasterized input. Reported to Wolfram support CASE:4093797$Version(* "11.3.0 for Mac OS X x86 (64-bit)...

Asked on 12/21/2020 by Rohit Namjoshi

2 answer

Assign value to the symbol returned by function

Ok, so here is example code:Clear[p, flag, k];p = 2;k = 1;flag = True;If[flag, p, k] = 0;pAfter that I get the messageSet::write: Tag If in If[True,p,k] is...

Asked on 12/21/2020 by Saeki Amae

3 answer

How To Define An Outer Product (in xAct)?

I am working with xAct / xCoba / xTras and I would like to construct a matrix out of a vector.So, I have a vector V on a manifold...

Asked on 12/21/2020

0 answer

Solve`DirInf[] — Meaningful value or just a bug?

Bug introduced in 4.1 or earlier and persisting through 12.2.0. or laterTo the problem below, I get four independent, incomplete solutions, three in terms of Solve`DirInf[]. Since DirInf...

Asked on 12/21/2020 by Michael E2

1 answer

Specifying general covariance to an ItoProcess?

I'm studying a system of stochastic equations and I would like to specify the covariance between the Wiener processes appearing in each. The Mathematica help's page for ItoProcess indicates that...

Asked on 12/21/2020 by Eric Bittner

0 answer

HankelTransform problem

Somewhere in the following code there is a bug. The result should not be zero!FunctionExpand@HankelTransform[Sqrt[r] Cos[r], r, k, 1/2]I think the answer should be undefined or a message like...

Asked on 12/21/2020 by SolutionExists

0 answer

Trouble when attempting to import a dat resource

I am trying to import the "Patient Medical Data for Novel Coronavirus COVID-19" dataset from the Wolfram Data Repository, but when I import, it shows me just 427036 results instead...

Asked on 12/21/2020 by Anto

1 answer

Experimental`CreateNumericalFunction

When working with a Compile function I can specify if a given argument is a matrix, a vector or a scalar. For instance, something like:fC=Compile[{{x,_Real,2},{y,_Real,2},{a,_Real}},a x^2+y^2];Is there a way...

Asked on 12/21/2020

1 answer

LyX-like LaTeX in Mathematica Text Cells

Lately I've been learning more about the Wolfram Language, and I've become particularly enamored with the stated goals of the Mathematica notebook interface. I've used Mathematica exclusively as a "super...

Asked on 12/20/2020 by sferics

1 answer

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