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From: | David Bateman |
Subject: | Re: Octave hangs forever trying to invert singular matrix |
Date: | Tue, 22 Dec 2009 22:23:11 +0100 |
User-agent: | Mozilla-Thunderbird 2.0.0.22 (X11/20090706) |
Vic Norton wrote:
Giving an unreasonable answer is ok, hanging isn't... This is hanging in the CXSparse QR code I presume, but as I was working (admitted very slowly) on converting this to use the SPQR code from SuiteSparse, I don't think I can be bothered trying to fix this. SPQR is much faster and allows a 2-norm solution that is consist with the same case for a full matrix,I don't see how any numerical routine can give you a reasonable answer. This is a 0/0 problem.
D.
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