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| bio | website | sites.google.com/site/… |
|---|---|---|
| location | Freiburg, Germany | |
| age | ||
| visits | member for | 1 year |
| seen | Jun 14 at 14:16 | |
| stats | profile views | 35 |
I am a PhD student at the University of Freiburg, Germany. I perform small simulations in Mathematica (mostly, graph theory & complex networks) and, therefore, I am very interested in improving my programming skills.
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Dec 3 |
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Plotting Error Bars on a Log Scale this doesn't work either...does one have to install anything in addition? I get this message: Needs::nocont: Context ErrorBarLogPlots` was not created when Needs was evaluated. >> |
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Nov 30 |
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Plotting Error Bars on a Log Scale Strange...Once I write: Needs["ErrorBarLogPlots.m´"], I get the following error: Needs::cxt: Invalid context specified at position 1 in Needs[ErrorBarLogPlots.m\.b4]. A context must consist of valid symbol names separated by and ending with `. >> ... Am I doing something wrong? |
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Oct 9 |
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Make a density list plot/histogram from large, pre-binned data set? Do you really need a density plot? Cannot you just use a ListContourPlot[]? IMHO, this looks much clearer and you can really see the pattern. What is more, you can also output a color-bar and use many more other features... |
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Oct 5 |
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How to Delete Elements from List1 appearing in List2? Thanks a lot, this works for any nested list! :) Great solution! |
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Oct 4 |
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Counting negative values in list Thanks! I was trying out something similar by putting imaginary parts into a separate list and then checking the length of it... |
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Sep 19 |
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Counting negative values in list Looks like this is a very nice approach. However, this doesn't work if one wants to count complex numbers in a list. I also tried the straight away form (where ev is the list of numbers): count[];
For[u = 1, u <= 6, u++,
If[Abs[Im[ev[[u]]] > 10^-10], count++];
]; But no results...Maybe somebody has already done something like that? |
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Aug 9 |
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Orthonormalization of non-hermitian matrix eigenvectors @F'x there can be a perturbed Hamiltonian which is not anymore Hermitian. |
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Aug 9 |
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Orthonormalization of non-hermitian matrix eigenvectors hm...I am currently working with 49*49 non-Hermitian matrix, and I desperately try to orthogonalize the left and right eigenstates with the given above advices. I often get computation errors and have no idea how to handle it. I have also tried the Lapack routine (in Python), but it has not output me all the imagionary parts of the eigenvectors. And I cannot check this analytically. Maybe, somebody had the same problem and can give me a nice suggestion? Look forward... |
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Jun 5 |
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How do I keep the right ordering of eigenvalues using Eigensystem? I always use two different commands Eigenvalues[Matrix] and Eigenvectors[Matrix], so that Eigenvalues[Matrix][[i]] corresponds to Eigenvectors[Matrix][[i]]. It is a bit easier for me to work with two different lists. |
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Jun 4 |
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Using Gather to rearrange my data thank you very much for helping me! I used the approach of the first and the second suggestions, since it is mostly related to my research (graph theory), but I am sure that Gather can be a very good alternative. |
