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From: Aishwarya on 5 Oct 2009 07:31
One of the functions I use uses eigs. And it was running fine for a
week till suddenly it started throwing the following error :

Error using ==> eigs at 231
Error with ARPACK routine dnaupd: info = -8

I hope someone can explain what the problem is and tell me to how to
overcome it.

From: Bruno Luong on 5 Oct 2009 08:04
Aishwarya <aishwarya.t(a)gmail.com> wrote in message <539e0537-8b49-4644-b3c3-e3530ee1c097(a)a37g2000prf.googlegroups.com>...
> One of the functions I use uses eigs. And it was running fine for a
> week till suddenly it started throwing the following error :
>
> Error using ==> eigs at 231
> Error with ARPACK routine dnaupd: info = -8
>
> I hope someone can explain what the problem is and tell me to how to
> overcome it.

http://www.cs.utk.edu/~cronk/CE/RIB/docs/ARPACK/ug.ps
See error code page pg 127/128.

Spectral calculation is one of the most difficult numerical calculation. Iterative methods are unstable. When the data (matrix) is not favorable, it could fail. Without knowing the properties of your matrix, it's hard to make precise diagnostic (still difficult even if we would know the matrix).

Bruno
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