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Re: new snapshot?
From: |
John W. Eaton |
Subject: |
Re: new snapshot? |
Date: |
Fri, 26 Feb 2010 17:28:29 -0500 |
On 26-Feb-2010, Michael D. Godfrey wrote:
| On 2/26/10 10:15 AM, Jaroslav Hajek wrote:
| > Are you sure? This is exactly the opposite of what I get. Sometimes
| > the assert fails with
| >
| > !!!!! test failed
| > assert (s (k:-1:1),s2,1e-10) expected
| > 38.060
| > 38.060
| > 38.034
| > 38.034
| > 38.015
| > 38.015
| > 38.004
| > but got
| > 38.060
| > 38.034
| > 38.034
| > 38.015
| > 38.015
| > 38.004
| > 38.004
| > maximum absolute error 0.0263523 exceeds tolerance 1e-10
| >
| > and the latter result is correct, AFAIK.
| >
| >
| The latter result is s2 in the test. This is what I get too. s2,
| computed from:
| [u2,s2,v2,flag] = svds(a,k,0);
| s2 = diag(s2);
| is correct. It is the "expected" vector that is wrong. This comes from:
| a =
|
sparse([3:n,1:n,1:(n-2)],[1:(n-2),1:n,3:n],[ones(1,n-2),0.4*n*ones(1,n),ones(1,n-2)]);
| [u,s,v] = svd(full(a));
| s = diag(s);
| [dum, idx] = sort(abs(s));
| s = s(idx);
|
| Agree?
The problem is with svds, not svd on the full matrix. I should have
put the arguments to assert in the opposite order.
Sorry for the confusion,
jwe
- Re: new snapshot?, (continued)
- Re: new snapshot?, John W. Eaton, 2010/02/24
- Re: new snapshot?, Jaroslav Hajek, 2010/02/25
- Re: new snapshot?, John W. Eaton, 2010/02/25
- Re: new snapshot?, John W. Eaton, 2010/02/25
- Re: new snapshot?, Søren Hauberg, 2010/02/25
- Re: new snapshot?, Michael D. Godfrey, 2010/02/26
- Re: new snapshot?, John W. Eaton, 2010/02/26
- Re: new snapshot?, Michael D. Godfrey, 2010/02/26
- Re: new snapshot?, Jaroslav Hajek, 2010/02/26
- Re: new snapshot?, Michael D. Godfrey, 2010/02/26
- Re: new snapshot?,
John W. Eaton <=
- Re: new snapshot?, Michael D. Godfrey, 2010/02/26
- Re: new snapshot?, Michael D. Godfrey, 2010/02/26
- Re: new snapshot?, Michael D. Godfrey, 2010/02/26
- Re: new snapshot?, David Bateman, 2010/02/28
- Re: new snapshot?, Michael D. Godfrey, 2010/02/28
Re: new snapshot?, Benjamin Lindner, 2010/02/18
R: new snapshot?, Marco Atzeri, 2010/02/26
Re: new snapshot?, Ben Abbott, 2010/02/25