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94,860
questions
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Unwanted Oscillation in Solution occurs when Solving Poisson-Nernst-Planck equation
This is a follow-up post for this question. I am trying to solve the Poisson-Nernst-Planck equation in the form similar to eqns 9 and 10 in this research paper.
Different than the previous question, ...
- 367
-2
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answers
10
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Evaluating Step functions
Please guys, how do I tell Mathematica to return f(a-b)= 1 if a=b and 0 otherwise?
This means that f(0)=1 and f(x)=0 for x>0.
- 1
1
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1
answer
14
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Non-ASCII characters are not imported correctly in MetaInformation (Solution for FLAC attached)
When importing meta information of music files, non-ASCII characters are not imported correctly. It seems that only the last byte is imported.
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- 408
1
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2
answers
38
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setting position of PlotLegends affect position of PlotLabel
Plot[{Sin[x], Cos[x]}, {x, 0, 6}, ImageSize -> 400,
Frame -> True,
FrameLabel -> {"x", "y"},
PlotLabel -> "a"]
gives
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- 17.2k
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35
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NDsolve Error "Cannot be used as a variable." [closed]
I've looked at the other NDsolve Error questions and none have helped.
This is my code:
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- 1
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23
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Continuous Wavelet Transform Coefficients
I am trying to reconstruct the continuous wavelet transform coefficients from Mathematica without using the ContinuousWaveletTransform function. I need to create this reconstruction for my data in a ...
- 9
1
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0
answers
24
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Minimum Distance to Fly to Each European Country
Help me plan my holiday. These are all my available flights that I can get on airline points. I'm trying to work out what is the shortest distance to travel if I want to go to each every European ...
- 4,558
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16
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Function LaplaceGaussian Filter -> What exactly is standardized, if this option is chosen?
I try to figure out what the option Standardized->True for function LaplacianGaussianFilter exactly means. I understand that it guarantees that the sum over the Kernel is exactly zero. But what ...
- 13
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22
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SixJSymbol not triangular in basis transformation
The basis transformation is given by
$$\left| J^{P}, jd \right\rangle = \sum_ {S} (-1)^{J + L + Sd + Sq}\sqrt {(2 S + 1) (2 jd + 1)}\, \biggl\{\begin {array} {ccc} L & Sq & J \\ S & Sd &...
1
vote
1
answer
41
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How to project a intersection shape in a 3D set of surfaces
I need to get a intersection curve on the bottom of the 3D shape generated below:
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- 498
1
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0
answers
29
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How to abort a parallel computation?
This is a minimal working example. I have a computation that runs in parallel for ever, and now and then prints a result.
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- 10.2k
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21
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Parallelization with Do and ParallelSubmit
I have quite a large expression that I need to integrate. My ansatz was to Expand the expression (easiest case results in ~5.5 million terms) and parallelize the ...
- 1,419
4
votes
1
answer
97
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Function argument with tree type
I liked to define a function argument type representing a tree with only nodes: 0,1. Every subtree is defined as a list like this:
{node,{subtree1},{subtree2},...}
The definition is recursive. The ...
- 691
0
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36
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0
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44
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Why is there a difference in computational speed when judging the size of inequalities in these two forms? [closed]
Method One:
Reduce[ForAll[{x, y, z}, {x > y > 1 > z > 0, a == (1 + x z)/z,
b == (1 + x y)/x, c == (1 + y z)/y}, a > b && c < a]]
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- 4,521