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From: Matt J on 16 Jun 2010 13:57
"Juliette Salexa" <juliette.physicist(a)gmail.com> wrote in message <hvb0r9$bdk$1(a)fred.mathworks.com>...

> > As an FYI, you don't need to be computing lengthOfAover3. You can just do
> > temp=reshape(A,[],3);
>
> I think this might be slower because matlab has to calculate what the missing dimension is (when repeated 10000 times that overhead could build up)
==============

I tend to doubt it. Compared to all the sums and multiplications you're doing elsewhere in the loop, this is a ridiculously small fraction of the total computation, even if temp really only does have 9 elements (I assume in reality there are more??).

Also, since reshape() is implemented in optimized C code, there's a chance that the missing dimension will be calculated in the CPU, which would be much faster than fetching lengthOfAover3 from RAM.
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