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Nov
8
awarded  Nice Answer
Nov
8
revised Kernel inexplicably hangs if I define a pure function without suppressing output
edited tags
Nov
8
comment Kernel inexplicably hangs if I define a pure function without suppressing output
I can reproduce what you see on OS X 10.9.0, M9.0.1. It eats up all the memory, so anyone trying this, be careful!! It hung another program on my system and I lost a document. I had to kill the remaining MathKernels by hand. I think you should report this bug.
Nov
8
awarded  Popular Question
Nov
8
revised Generating a graph where vertices correspond to points in an integer lattice and edges connect points less than a threshold distance apart
added 1 characters in body
Nov
8
revised How to find all graph isomorphisms in FindGraphIsomorphism
edited body
Nov
8
comment Removing reverse versions of lists from a nested list
@Kuba But the basic idea is sane: find a canonical for for sublists, then use Union for an efficient solution. The question is: what efficiently computable canonical form can we use? (I.e. a way to unambiguously choose either list or Reverse[list] for each item.)
Nov
8
revised Removing reverse versions of lists from a nested list
added 4 characters in body
Nov
8
answered Generating a graph where vertices correspond to points in an integer lattice and edges connect points less than a threshold distance apart
Nov
7
comment Simplifying If statements
@payne Or just your example with bar ... which gets evaluated.
Nov
7
comment Simplifying If statements
@payne Despite that Piecewise does evaluate its arguments.
Nov
7
comment Export complex number to excel or txt file
Excel does not directly support complex numbers, without any addons. For MATLAB I recommend MATLink (which halirutan has already mentioned). I am one of the authors of MATLink so please ask me if you are having trouble with it.
Nov
7
comment Export complex number to excel or txt file
Yes, MATLink does support transferring complex numbers to/from MATLAB :-)
Nov
7
comment Why can I still hear sound when the frequency of the periodic function inside Play is lower than the range of human ear?
If this is indeed the cause then the effect should be considerably stronger with SampleDepth -> 8. This provides a means of testing if this is the real cause.
Nov
7
comment Why can I still hear sound when the frequency of the periodic function inside Play is lower than the range of human ear?
I can't hear it either. Based on the frequency scaling according to the sample rate you discovered, could it be quantization noise? Does the sound differ between SampleDepth -> 8 and SampleDepth -> 16?
Nov
7
awarded  Necromancer
Nov
7
revised How to find all graph isomorphisms in FindGraphIsomorphism
edited tags
Nov
7
comment How to use Automorphisms[] on a graph?
If you only need the order of the group, and especially if performance is important, take a look at the RLink based answer (the last one). That one shows how to get the order. The setup there is really a bit complicated, but only the first time you do it.
Nov
7
comment How to use Automorphisms[] on a graph?
I don't think it's complicated. You just need to convert the built-in Graph type to a COmbinatorica graph using GraphUtilities`ToCombinatoricaGraph and then you can apply the Combinatorica functions. The complicated part for me is keeping Combinatorica out of the context path. That nasty ToCombinatoricaGraph keeps re-adding it.
Nov
7
comment How to use Automorphisms[] on a graph?
Let me know if that other question doesn't help. Out of the three solutions presented there, I currently prefer the RLink based one for its performance, but it does need some initial setup.