[SciPy-user] do complex numbers default to double precision?
nwagner at mecha.uni-stuttgart.de
Thu Jun 30 06:03:53 CDT 2005
Ryan Krauss wrote:
> I have a matrix that is a function of a complex valued input. I am
> trying to find that value of that input that drives the determinant of
> the matrix to zero. I am searching for this value using fmin. The
> error I am trying to minimize is the abs(det(complex matrix)).
It's not a good idea to use the determinant directly since det(A) is a
rapidly varying function. As far as I understand your problem,
you are interested in the solution of a two-parameter nonlinear
eigenvalue problem. Is that correct ? How about the size of your complex
matrix A ?
> I don't seem to be able to drive this error lower that roughly 9e-17,
> regardless of the values for ftol and xtol I use.
> Am I hitting some internal limitation? Are complex values by default
> single or double precision?
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