problem with eigenvalues

[Nicola Manica]

Hi, I'm trying to solve a probabilistic model finding the eigenvalues of a sparse matrix.

The idea is to compute the eingenvalue of value 1, but I have some problem when matrixes

become big..

The output of octave is 

error: eigs: error -14 in dneupd
error: called from:
error: nowork.m at line 4, column 14

I attach three examples created in the same mode:

nowork.m: error 

sometimes work.m: after many attempts octave gives me the correct results 

work.m: always correct

my OS is gentoo, octave is version 3.2.3.

Thank you very much for your help,

Best regards 

Nicola

matrix.tar.gz
Description: GNU Zip compressed data