[Octave-bug-tracker] [bug #53700] eigs test failure related to ARPACK generating real NaN rather than complex NaN+1i*NaN

[Mike Miller]

Follow-up Comment #1, bug #53700 (project octave):

With ARPACK 3.5.0 on Debian (Debian package version 3.5.0+real-2, same as
Ubuntu dev), I get no failures:


>> test eigs
PASSES 179 out of 179 tests
>> A = magic (100) / 10 + eye (100);
>> opts.v0 = (1:100)';
>> opts.maxit = 10;
>> d = eigs (A, 10, "sm", opts);
warning: eigs: Only 3 of the 10 requested eigenvalues converged
warning: called from
    eigs at line 265 column 18
>> assert (d(10), NaN+1i*NaN);
>> d(10)
ans =  NaN + NaNi
>> d
d =

   1.00000 + 0.00000i
   1.00000 - 0.00000i
   1.00000 + 0.00000i
       NaN +     NaNi
       NaN +     NaNi
       NaN +     NaNi
       NaN +     NaNi
       NaN +     NaNi
       NaN +     NaNi
       NaN +     NaNi

>> imag(d)
ans =

   0.0000e+00
  -8.6837e-13
   8.6837e-13
          NaN
          NaN
          NaN
          NaN
          NaN
          NaN
          NaN



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