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[Octave-bug-tracker] [bug #34461] Error in svds test with 3.4.3-rc0

From: Edward Meyer
Subject: [Octave-bug-tracker] [bug #34461] Error in svds test with 3.4.3-rc0
Date: Thu, 09 Aug 2012 04:23:41 +0000
User-agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:14.0) Gecko/20100101 Firefox/14.0.1

Follow-up Comment #15, bug #34461 (project octave):

I'm submitting a patch which I believe fixes this problem in addition to a few
others that have been on the maintainers list. The main problem is defaulting
the convergence tolerance to 1e-10 which is much too big. It's false economy
to not let ARPACK iterate to max precision, which then makes it much more
likely that the computed singular values will be close enough to those
computed by the dense svd.
I put together a more realistic test with random sizes, shapes, and values;
with this patch it passes hundreds of these, without it 10 percent or so fail.
 I could add this to the svds() test.

(file #26339)

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