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

[Rik]

Follow-up Comment #13, bug #49523 (project octave):

@Marco: I'm going to change my advice in comment #12.  It seems to me that
eigs is generally only used when you want a few eigenvalues from a large
sparse matrix.  For a low number, say N < 50, it really isn't much of a
performance hit to iterate over the entire return list to see if there are any
true complex eigenvalues or if there are only complex eigenvalues where the
imaginary part is zero.  Thus, I think you should go ahead and return NaN if
all the values are real or Nan+NaNi if there are complex values. 

    _______________________________________________________

Reply to this item at:

  <http://savannah.gnu.org/bugs/?49523>

_______________________________________________
  Message sent via/by Savannah
  http://savannah.gnu.org/