[uBlas] Fastest way to change sing of matrix

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Newsgroups gmane.comp.lib.boost.ublas
Message-ID <CAHq7APFBL_YU5tHEFBhkYKhCQsLdkrv0A_MiJORUUS+sNB1kYQ@mail.gmail.com> 
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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