Re: svd

[Tatsuro MATSUOKA]

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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