Re: logm, sqrtm, funm

[Philip Nienhuis]

"Tommy Guy" wrote:
> funm and logm do have the same problems.  Using a Schur decomposition
> followed by an algorithm to calculate the function of the upper
> triangular algorithm is probably what the competition is using, but it
> is also an openly published algorithm with good results.  sqrtm (in
> Octave source) has been converted to use the Schur decomposition
> method and implemented in c++.  This provides a guide to anyone
> wanting to try to fix logm.

FWIW, one of the authors of your literature ref provides a (basic) matrix
functions toolbox under the GPL v. 3 license:
  http://www.maths.manchester.ac.uk/~higham/mftoolbox/

Another (significantly more involved) one is on this web page:
  http://www.maths.manchester.ac.uk/~higham/NAMF/
There's no mentioning of any license, only a note on the web page of the
institution that supplied the grant for the research that led to this
toolbox, that Intellectual Property is a responsibility of the researchers
in question.

Philip

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