Re: [uBlas] Fastest way to change sing of matrix

"oswin krause" <[email protected]> 15 Apr 2013 19:56:28 +0200

Newsgroups	gmane.comp.lib.boost.ublas
Message-ID	<[email protected]>

Hi,

there is unfortunately only little information about A (e.g. is A big? 
is it dense? sparse? is it a matrix, bounded_matrix or c_matrixr?). As i 
assume A to be a small matrix:

noalias(A)=-A

fixes everything.

On 15.04.2013 18:36, [email protected] wrote:
> Hi list,
>
> I need to change the sign of each element in a (very large) matrix.
>
> I know a way that is very slow
> A = -A;
>
> What is the fastest way to do this?
>
> Thanks in Advance
>
>
>
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