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From: sara on 25 May 2010 20:04
Hi Bruno,

The matlab help doesn't list QR as a method supported by the parallel computation. And I did try it after reading your reply, and I got the following message:

Undefined function or method 'qr' for input arguments of type 'codistributed'

"Bruno Luong" <b.luong(a)fogale.findmycountry> wrote in message <hth852$jo$1(a)fred.mathworks.com>...
> "sara " <ssalha(a)ucla.edu> wrote in message <hth7gk$gt3$1(a)fred.mathworks.com>...
> >
> >
> > QR is a lower level operator though than \ , pinv and SVD, so it might be easier to parallelize it? I wonder why it is not available.
>
> What you mean by "it is not available"? Of course it is.
>
> And I disagree, it is not lower level than SVD. Both are basic matrix factorizations.
>
> Bruno
From: Bruno Luong on 26 May 2010 02:30
"sara " <ssalha(a)ucla.edu> wrote in message <hthohl$r5c$1(a)fred.mathworks.com>...
> Hi Bruno,
>
> The matlab help doesn't list QR as a method supported by the parallel computation. And I did try it after reading your reply, and I got the following message:
>
> Undefined function or method 'qr' for input arguments of type 'codistributed'
>

Sorry for missreading. I don't know anything about parallelization or codistribution.

Note that QR is basically a sequential algorithm where one step must carried out after other.

Bruno
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