# Anastasiia Anishchenko

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bio website sites.google.com/site/… location Freiburg, Germany age member for 1 year seen Jun 14 at 14:16 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.

 Dec3 comment Plotting Error Bars on a Log Scalethis 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. >> Nov30 comment Plotting Error Bars on a Log ScaleStrange...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? Oct9 comment 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... Oct5 comment How to Delete Elements from List1 appearing in List2?Thanks a lot, this works for any nested list! :) Great solution! Oct4 comment Counting negative values in listThanks! I was trying out something similar by putting imaginary parts into a separate list and then checking the length of it... Sep19 comment Counting negative values in listLooks 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? Aug9 comment Orthonormalization of non-hermitian matrix eigenvectors@F'x there can be a perturbed Hamiltonian which is not anymore Hermitian. Aug9 comment Orthonormalization of non-hermitian matrix eigenvectorshm...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... Jun5 comment 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. Jun4 comment Using Gather to rearrange my datathank 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.