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Topic: performance of parfor
Replies: 4   Last Post: Apr 8, 2013 3:28 AM

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Posts: 185
Registered: 11/19/09
Re: performance of parfor
Posted: Apr 8, 2013 3:28 AM
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"Steven_Lord" <> wrote in message <kjn2k9$1p7$>...
> "kinor " <> wrote in message
> news:kjmo9e$pl6$

> > Edric M Ellis <> wrote in message
> > <>...

> >> "kinor " <> writes:
> *snip*

> > I looked in the help of rank, its multithreading is not mentioned there,
> > where did you know that?

> Technically the RANK function itself is not multithreaded, as it is a MATLAB
> function file and it doesn't use any of the parallel constructs like PARFOR
> or SPMD from Parallel Computing Toolbox.
> However, most of the time required to compute RANK is used by computation of
> the singular values of the input matrix using SVD, and SVD _is_
> multithreaded (under certain conditions, notably when the data is large
> enough.)
> I'd say that's close enough to count Edric's statement as correct.
> --
> Steve Lord
> To contact Technical Support use the Contact Us link on

Hi Steve

thanks a lot for the enlighting comment, I did not doubt Erics comment. I was just surprised.
thanks again Eric.

best regards

@ all

any idea why the last example i posted is not faster with parfor?

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