On Fri, Apr 6, 2012 at 1:56 AM, Christoph Groth <c...@falma.de> wrote:
> I noticed that numpy.linalg.eigvalsh returns a complex array, even > though mathematically the resulting eigenvalues are guaranteed to be > real. > > Looking at the source code, the underlying zheevd routine of LAPACK > indeed returns an array of real numbers which is than converted to > complex in the numpy wrapper. > > Does numpy policy require the type of the result to be the same as the > type of input? Copying an array twice to arrive at the original result > seems pointless to me. > > I think this should be fixed, the problem is the wrapper from a complex array. Not sure what the easiest fix is. I expect eigh is similar in behavior. Chuck
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