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## [Octave-bug-tracker] [bug #53700] eigs test failure related to ARPACK ge

**From**: |
Mike Miller |

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

**Date**: |
Thu, 19 Apr 2018 18:04:53 -0400 (EDT) |

**User-agent**: |
Mozilla/5.0 (X11; Linux x86_64; rv:59.0) Gecko/20100101 Firefox/59.0 |

Follow-up Comment #9, bug #53700 (project octave):
Dan - no, I meant it is following the right path. It's a very large if-else so
it was hard to associate your debug prints with line numbers. But it's
supposed to be the condition where A is not sparse, not complex, A is not a
function handle, sigma is zero, have_sigma is true, symmetric is false. I
think it's the case you labeled " NOT SYMMETRIC".
I think you changed the wrong routine in eigs-base.cc, it should be
'EigsRealNonSymmetricMatrixShift'.
Since it works fine in Debian and in Fedora with the same version of ARPACK,
this could be due to some difference like default compiler options used in
Ubuntu (which have definitely made a difference in other situations).
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**[Octave-bug-tracker] [bug #53700] eigs test failure related to ARPACK generating real NaN rather than complex NaN+1i*NaN**, *Dan Sebald*, `2018/04/19`
**[Octave-bug-tracker] [bug #53700] eigs test failure related to ARPACK generating real NaN rather than complex NaN+1i*NaN**, *Mike Miller*, `2018/04/19`
**[Octave-bug-tracker] [bug #53700] eigs test failure related to ARPACK generating real NaN rather than complex NaN+1i*NaN**, *Dan Sebald*, `2018/04/19`
**[Octave-bug-tracker] [bug #53700] eigs test failure related to ARPACK generating real NaN rather than complex NaN+1i*NaN**, *Mike Miller*, `2018/04/19`
**[Octave-bug-tracker] [bug #53700] eigs test failure related to ARPACK generating real NaN rather than complex NaN+1i*NaN**, *Mike Miller*, `2018/04/19`
**[Octave-bug-tracker] [bug #53700] eigs test failure related to ARPACK generating real NaN rather than complex NaN+1i*NaN**, *Dan Sebald*, `2018/04/19`
**[Octave-bug-tracker] [bug #53700] eigs test failure related to ARPACK generating real NaN rather than complex NaN+1i*NaN**, *Mike Miller*, `2018/04/19`
**[Octave-bug-tracker] [bug #53700] eigs test failure related to ARPACK generating real NaN rather than complex NaN+1i*NaN**, *Dan Sebald*, `2018/04/19`
**[Octave-bug-tracker] [bug #53700] eigs test failure related to ARPACK generating real NaN rather than complex NaN+1i*NaN**, *Dmitri A. Sergatskov*, `2018/04/19`
**[Octave-bug-tracker] [bug #53700] eigs test failure related to ARPACK generating real NaN rather than complex NaN+1i*NaN**,
*Mike Miller* **<=**
**[Octave-bug-tracker] [bug #53700] eigs test failure related to ARPACK generating real NaN rather than complex NaN+1i*NaN**, *Mike Miller*, `2018/04/19`
**[Octave-bug-tracker] [bug #53700] eigs test failure related to ARPACK generating real NaN rather than complex NaN+1i*NaN**, *Mike Miller*, `2018/04/19`
**[Octave-bug-tracker] [bug #53700] eigs test failure related to ARPACK generating real NaN rather than complex NaN+1i*NaN**, *Mike Miller*, `2018/04/20`
**[Octave-bug-tracker] [bug #53700] eigs test failure related to ARPACK generating real NaN rather than complex NaN+1i*NaN**, *Marco Caliari*, `2018/04/20`
**[Octave-bug-tracker] [bug #53700] eigs test failure related to ARPACK generating real NaN rather than complex NaN+1i*NaN**, *Dan Sebald*, `2018/04/20`
**[Octave-bug-tracker] [bug #53700] eigs test failure related to ARPACK generating real NaN rather than complex NaN+1i*NaN**, *Marco Caliari*, `2018/04/20`
**[Octave-bug-tracker] [bug #53700] eigs test failure related to ARPACK generating real NaN rather than complex NaN+1i*NaN**, *Dan Sebald*, `2018/04/20`
**[Octave-bug-tracker] [bug #53700] eigs test failure related to ARPACK generating real NaN rather than complex NaN+1i*NaN**, *Dan Sebald*, `2018/04/20`
**[Octave-bug-tracker] [bug #53700] eigs test failure related to ARPACK generating real NaN rather than complex NaN+1i*NaN**, *Mike Miller*, `2018/04/20`
**[Octave-bug-tracker] [bug #53700] eigs test failure related to ARPACK generating real NaN rather than complex NaN+1i*NaN**, *Dan Sebald*, `2018/04/20`