Re: [ublas] Bad prod efficiency of sparse/symmetry matrix ?

From: Seabook (cipoke_at_[hidden])
Date: 2006-12-08 10:42:42

Sorry .. I found the attachment but it's not a source code.
Maybe I open it incorrectly.

My classmate ever demo Altas library for me.
It's really fast when your matrix is bigger.

any way, thanks a lot again

If I am free ,I will try to test all kind  efficiency  of prod .

Kuo-Shih

Gunter Winkler wrote:
> 
> On Friday 08 December 2006 15:59, Seabook wrote:
>> I will try that but I still don't know how to use axpy_prod.
> 
> 1) modify the line in operation.hpp marked with +/i in my diff
> 2) use axpy_prod(A,X,Y,true) for Y = prod(A,X) 
>    and axpy_prod(A,X,Y,false) for Y += prod(A,X)
> 
>> Could you paste your source code with axpy_prod operation?
> 
> I should have atached it already :(
> 
> BTW. ublas' product of dense matrices is a lot slower than any optimized
> blas3 
> routine. However, you can use the atlas-bindings to use blas instead of
> prod.
> 
> mfg
> Gunter
> 
> _______________________________________________
> ublas mailing list
> ublas_at_[hidden]
> http://lists.boost.org/mailman/listinfo.cgi/ublas
> 
> 

-- 
View this message in context: http://www.nabble.com/Bad-prod-efficiency-of-sparse-symmetry-matrix---tf2766020.html#a7759673
Sent from the Boost - uBLAS mailing list archive at Nabble.com.