Re: MEX/Mkoctfile questions about matrices algorithms...why slower?

[David Bateman]

钟 伟生 wrote:
> Hi,
> 
> I really appreciate your reply. ATLAS project maybe an efficient way to
> do the improvement on matrix math. But I am still wondering to know the
> reason why the run time increased.
> 
> Theoretically speaking, while using the interface functions
> (MEX/DEDUN-DLD) combining matlab/octave with C/C++ language, the matrix
> math should be faster than before. So, what is the key problem which
> makes it slower? The algorithms or the overhead generating by the MEX?
> If the front one, I will try to solve it. Thank you!
> 
>
Because when you use the "*" operator in octave/matlab there is probably
a large chance that it is using ATLAS internally. Therefore, rewriting
it in MEX/OCT can only have the effect of slowing things up..

D.