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Failure in eigs test with 3.1.54


From: John W. Eaton
Subject: Failure in eigs test with 3.1.54
Date: Mon, 9 Mar 2009 18:30:19 -0400

On  9-Mar-2009, Rafael Laboissiere wrote:

| When building version 3.1.54-1 of the Debian package octave3.1, I noticed
| that the eigs.cc tests failed.  I found a minimal code to reproduce the
| error, in my Debian sid chroot:
| 
| $ octave3.1 -q
| octave3.1:1> n = 20;
| octave3.1:2> k = 4;
| octave3.1:3> A = 
sparse([3:n,1:n,1:(n-2)],[1:(n-2),1:n,3:n],[ones(1,n-2),1:n,-ones(1,n-2)]);
| octave3.1:4>  d0 = eig (A);
| error: memory exhausted or requested size too large for range of Octave's
| index type -- trying to return to prompt
| 
| Before I start trying to debug the above, could someone please tell me
| whether this is an expected failure or not?

No, it's not expected.  I can't reproduce it on my system (AMD64
system running Debian testing, updated in the last few days).

jwe


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