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Re: math problem: matrix exponential not following the rules in ML or Oc


From: Nicholas Jankowski
Subject: Re: math problem: matrix exponential not following the rules in ML or Octave?
Date: Fri, 7 Aug 2015 18:37:40 -0400

On Tue, Aug 4, 2015 at 8:33 PM, Nicholas Jankowski <address@hidden> wrote:
wrote it up over at stackexchange. would appreciate it if anyone could take a look and give me their thoughts.  basically, having trouble taking a matrix to a fractional exponent and getting the 'expected' value. it involves solving an eigenvalue problem internally, i've tried verifying via Maxima, and it 'should work' but I don't know what I'm missing with how Octave/ML handle the fractional exponent... is it a normalization thing, etc.

http://math.stackexchange.com/questions/1383443/matrix-with-fractional-exponent-not-getting-expected-output-in-matlab-octave

Ok, crickets on that one. Could someone used to navigating the Octave source point me to the source on Savannah for either mpower or the ^ operator (assuming one's just an alias to the other), want to see if they're set to do the eigenvector route or if they call something like A^x = expm(x*logm(A)), as calling those gives me the same output.


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