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svds test failures


From: Marco atzeri
Subject: svds test failures
Date: Sat, 06 Aug 2011 12:18:15 +0200
User-agent: Mozilla/5.0 (Windows NT 5.1; rv:5.0) Gecko/20110624 Thunderbird/5.0

Hi,
on cygwin this test is always failing due to the
sigma=0 value used

[u2,s2,v2,flag] = svds(A,k,0,opts);
warning: returning fewer singular values than requested
warning: try increasing the value of sigma

Is it a problem to increase the value to at least 0.03 ?

octave:24> [u2,s2,v2,flag] = svds(A,k,0.03,opts);
octave:25>  s2 = diag(s2)
s2 =

   38.060
   38.034
   38.034
   38.015
   38.015
   38.004
   38.004


as expected.

Marco



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