[Octave-bug-tracker] [bug #41305] eigs: error -14 in dneupd when requesting fewer eigenvalues

[Marco Caliari]

Follow-up Comment #21, bug #41305 (project octave):

-14 in XYeupd is "did not find any eigenvalues to sufficient accuracy". It is
just non-convergence with the given parameters. The error message comes from
eigs-base.cc, so it can be modified. I do not think (anymore) it is a bug in
arpack, but rather a possible defect in the "implicitely restarted Arnoldi
method". We could change the error message to something like: "It was not
possibile to find any eigenvalues to sufficient accuracy. Try to increase the
tolerance, the maximum number of iterations, or the number of requested
eigenvalues".

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