On Thu, 27 Feb 2014, Keivan Monfared wrote:
I want to check to see if a matrix that I find is permutation of another
matrix which is already in the list.
You should define some order for matrices. Then you only need to compare
about log N (where N=number of matrices already in list) matrices to see
if you already have matrix in question at list, and if not, where to place
it.
* * *
If you just ask generally "how to see if A =~ B?", where =~ means "is
similar to some respect", then I'll ask about propabilities. If you mostly
have NOT A =~ B, then try to find some fast way to check if A and B are
not similar.
To give extremely simple example: to see if finite groups A and B are
isomorphic, see if they have same number of elements.
--
Jori Mäntysalo
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