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Re: svd
From: |
Tatsuro MATSUOKA |
Subject: |
Re: svd |
Date: |
Mon, 14 Jun 2010 11:22:31 +0900 (JST) |
Hello
I have carried out on the mingw platform. The situation seems to be the same.
Octave-3.2.4(Bejamin altas 3.8.2)
octave:1> a=randn(1000);
octave:2> tic; svd(a); toc
Elapsed time is 3.76562 seconds.
octave:3> tic; [u,s,v] = svd(a); toc
Elapsed time is 25.2969 seconds.
3.3.51+(Build myself on May 26, 2010, altas 3.8.2)
octave.exe:1> a=randn(1000);
octave.exe:2> tic; svd(a); toc
Elapsed time is 3.01562 seconds.
octave.exe:3> tic; [u,s,v] = svd(a); toc
Elapsed time is 25.2344 seconds.
Regards
Tatsuro
--- "Dmitri A. Sergatskov" wrote:
> I've just noticed:
>
> octave:3> a=randn(1000);
> octave:4> tic; svd(a); toc
> Elapsed time is 2.7962 seconds.
> octave:5> tic; [u,s,v] = svd(a); toc
> Elapsed time is 25.3054 seconds.
>
> Is this dramatic slowdown in second case expected,
> or there is something wrong?
>
> octave-3.2.4 on fedora linux / x86_64 / atlas 3.8.3
>
> Dmitri.
> --
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> Help-octave mailing list
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> https://www-old.cae.wisc.edu/mailman/listinfo/help-octave
>
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- svd, Dmitri A. Sergatskov, 2010/06/13
- Re: svd,
Tatsuro MATSUOKA <=
- Re: svd, Carlo de Falco, 2010/06/14
- Re: svd, Jaroslav Hajek, 2010/06/14
- Re: svd, CdeMills, 2010/06/15