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[Octave-bug-tracker] [bug #49523] eigs (R2013b and later) uses NaNs, not


From: Marco Caliari
Subject: [Octave-bug-tracker] [bug #49523] eigs (R2013b and later) uses NaNs, not zeros, for unconverged Ritz values
Date: Wed, 12 Apr 2017 03:37:11 -0400 (EDT)
User-agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:52.0) Gecko/20100101 Firefox/52.0

Follow-up Comment #11, bug #49523 (project octave):

@Rik: If I set them to Complex (NaN, 0.), the result will be somethinkg like
(there are other complex eigenvalues)


ans =

  -0.00000 - 3.32975i
  -0.00000 + 3.32975i
       NaN + 0.00000i
 

or (all the remaining eigenvalues are real)


ans =

   3.2154
      NaN
      NaN


If I set them to Complex (NaN, NaN), the result will be somethinkg like


ans =

  -0.00000 - 3.32975i
  -0.00000 + 3.32975i
       NaN + NaNi
 

or


ans =

   3.2154 + 0.00000i
      NaN + NaNi
      NaN + NaNi


If we want


ans =

  -0.00000 - 3.32975i
  -0.00000 + 3.32975i
       NaN + NaNi
 

or


ans =

   3.2154
      NaN
      NaN


we have to check the imaginary part of the converged eigenvalues. I mean, it
is not possible to set "without the complex [imaginary] part".


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