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Mathematica : Recent Questions and Answers (Page 11)

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

Efficiently removing elements from list of permutations

I'm looking for an efficient way to remove entries from a list of permutations. I have a list of variables from which I calculate all possible permutations. I then want...

Asked on 10/22/2021

1 answer

Rendering realistically looking rope

I used this code of user Henrik Schumacher to try render a realistic looking rope. The result using ParametricPlot3D is here:...

Asked on 10/22/2021

0 answer

How to solve the differential equation

I need to solve the differential equation DSolve[{(1-x)y''[x]==1/5 [Sqrt](1+y'[x]^2),y[0]==0,y'[0]==0},y[x],x] but the result given seems to be incorrect and returns an error...

Asked on 10/22/2021

1 answer

Derivative of real antisymmetric matrix in mathematica

Is it possible to find the derivative of components of a real antisymmetric matrix using index notation? Eg: I have a very large real antisymmetric matrix. Then from Matrix Cookbook,...

Asked on 10/22/2021

1 answer

Why Does Parallelization Not Speed Up these Seemingly Well-Parallelizable, Simple Functions?

Original ExampleConsider function f, a parallelized version fPar, and a coarsest-grained parallelized version fParCG below.f[l_] := Map[Function[x, x[[#]] & /@ ConstantArray[Range[l], l]], Permutations[Range[l]]]fPar[l_] := ParallelMap[Function[x, x[[#]] &...

Asked on 10/22/2021

1 answer

What is it that breaks CreateUUID in Mathematica 10.4.1 and how can I fix it?

All of a sudden my Mathematica 10.4.1 installation which worked well for several years does behave very strange. For example when I evaluate:CreateUUID[]this either returns unevaluated or creates a...

Asked on 10/22/2021

1 answer

How to rewrite a tensor as a matrix

I put{TensorProduct[{1, 0}, {0, 1}, {0, 1}, {0, 1}, {0, 1}]}/Sqrt[2]//MatrixFormand I got$$left(begin{array}{cc} left(begin{array}{cc} left(begin{array}{cc} 0 & 0 \...

Asked on 10/22/2021

4 answer

Export output to a text file

I have the following output obtained after optimizing the positions of geometry using Minimizecommand{x[1] -> 1011.07, y[1] -> 1127.56, z[1] -> 420.922, x[2] -> 940.095, y[2] ->...

Asked on 10/22/2021

3 answer

Kernel starts up very slowly on Linux

V 12.1.1, starting a kernel, e.g. by entering wolframscript in the shell, takes an unexpectedly long time (~5 min, the time elapsed between pressing Enter and the showing-up of In[1]...

Asked on 10/22/2021

1 answer

How to send a graphic in a text message to a smartphone? (Likely using Twilio)

I have used SendMessage["MMS".... to send text with graphics to my mobile phone number given at $MobilePhone. But I would like to send MMS messages to other phones as well....

Asked on 10/22/2021

0 answer

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