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

[Marco Caliari]

Follow-up Comment #2, bug #49523 (project octave):

I created a reproducible example for this issue.


A = toeplitz ([-2, 1, zeros(1, 8)]);
A = kron (A, eye (10)) + kron (eye (10), A);
opts.v0 = (1:100)';
opts.maxit = 1;
eigs (A, 4, "sm", opts)
warning: eigs: Only 3 of the 4 requested eigenvalues converged
warning: called from
    eigs at line 266 column 18
ans =

   0.00000
  -0.16203
  -0.39851
  -0.39851


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