Unanswered Questions
13,812 questions with no upvoted or accepted answers
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Wikipedia word cloud question from "An elementary introduction to the wolfram language"
I have been following the aforementioned course and it has been great. I am currently stuck on question 36.4: "Publish a form on the web that takes the topic of a Wikipedia page and gives a word ...
- 49
1
vote
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56
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Eigenvectors of GSE with right properties
I encountered a weird problem when trying to study a few properties of eigenvectors of matrices sampled from the Gaussian symplectic ensemble (GSE). I have encountered this while trying to understand ...
- 1,226
2
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answers
88
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$Assumptions set in init.m are reset back to True
I set $Assumptions to something in init.m. I followed it with printout to see that it was being set. However, once I get to my ...
- 41.5k
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127
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Summation contains additional $\frac{\zeta(3)}{8\pi^2}$ term if evaluated without presimplification
As noted in this math.se question from 2018 (which was using WolframAlpha and Mathematica 7.0, though it persists in 14.0.0), Mathematica's evaluation of the following sum depends on where the ...
- 41.5k
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85
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How should I handle required package dependencies in a package?
I'm writing a package A.
However, package A depends on package B (Mathematica), which the ...
- 1,417
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45
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Error when saving notebook, Mathamatica searches for a .m file
Whenever I save a my notebook (filename.nb), I get the error "RenameFile: Directory or file
"..path..\filename.m" not found.", and the file doesn't save.
It happens both with ctrl+...
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2
votes
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answers
61
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how to improve the predictor corrector schemes including computational cost
I am currently implementing a variable-order fractional predictor–corrector scheme in Mathematica. Since I am still a beginner with Mathematica programming, I encountered several issues during the ...
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78
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Displaying parentheses in axes labels
I have a list plot that I want to plot in a framed graph and have the following labels on the axes.
...
- 259k
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122
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1
vote
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73
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Neural Networks and Non Linear Fits
I'm trying to obtain the parameter models for various types of acoustic absorption materials.
When dealing with fiber (polyester, with low flow resistivity), the Wilson model, which has two parameters,...
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1
answer
110
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NMinimize apparently enters an infinite loop
I've stumbled across what seems to be a weird interaction of the NMinimize function.
I'm minimising the function -Log[Sin[2x]] + a Cos[x]^2 for $0 < x < \pi/2$...
- 167k
1
vote
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How to simply change filled-in marker with empty circles in the given code?
I use this code
p1 = Graphics[{PointSize[0.05], Red, Point[{{4, 0}, {7, 0}}]}];
p2 = Plot[Sin[x], {x, 0, 10}, PlotRange -> {-2, 2}];
Show[{p1, p2}]
which gives ...
- 1,179
1
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0
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58
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ToRules that preserves conditions that cannot be written as Rules
I would love to have a ToRules that can act on say Reduce output that preserves conditions that cannot be written as rules. Something that creates something like
...
- 4,931
8
votes
0
answers
167
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CollinearPoints returning True for noncollinear points
I think there might be an issue with CollinearPoints at least in the 14.2 Windows version I'm using. The issue arises where there are duplicate points and mixed ...
- 32.8k
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70
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Verify a first integral of a complicated ODE symbolically
I have an ODE of the form:
y^{(4)}[x]==F[y^{(3)}[x],y''[x],y'[x],y[x]]
for some complicated (but explicit) $F$ -- the exact form isn't really relevant to the ...
- 101