Generals matrixes product

swagger · **Joined:** Wed Oct 13, 2010 1:02 pm **Posts:** 5

Isn't there any function that calculates the product of two generals matrixes in ALGLIB?

Sergey.Bochkanov · **Joined:** Fri May 07, 2010 7:06 am **Posts:** 927

RMatrixGEMM, CMatrixGEMM from LinAlg package, ablas subpackage. They have somewhat low level, but flexible interface.

swagger · **Joined:** Wed Oct 13, 2010 1:02 pm **Posts:** 5

mmm... watching the functions, I think is more simple do the product with 3 FOR cicles...
Thank you

Sergey.Bochkanov · **Joined:** Fri May 07, 2010 7:06 am **Posts:** 927

Yes, simpler :)

But these functions have better performance when you work with large matrices: 1024x1024, for example. They are optimized for cache reuse and (in C++) can be several times faster than simple nested for loop.

swagger · **Joined:** Wed Oct 13, 2010 1:02 pm **Posts:** 5

Sergey.Bochkanov wrote:

But these functions have better performance when you work with large matrices: 1024x1024, for example. They are optimized for cache reuse and (in C++) can be several times faster than simple nested for loop.

Thanks for this information. Now I'll try with 3 FOR cicles, if it will bee too slow I'll try to implement the product with the RMatrixGEMM function. ;)
Thank you.

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