[Octave-bug-tracker] [bug #49523] eigs (R2013b and later) uses NaNs, not zeros, for unconverged Ritz values

[Rik]

Follow-up Comment #17, bug #49523 (project octave):

@Marco: I had originally proposed setting just the real part to NaN.  But, I
agree with you that it looks nicer if NaN + NaNi is returned for complex
unconverged eigenvalues.

I don't think it matters from a performance standpoint if we post-process the
list of eigenvalues because the number is going to be small, say 50
eigenvalues, relative to the size of the sparse matrix itself which could have
thousands to millions of rows or columns.

I'll accept whatever you feel is best.


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