Greetings,

Right now, if I want to take the negative of every element in a matrix I
end up doing the following:

// previously assigned
viennacl::matrix<T> vcl_A;

// matrix of zeros to subtract from
viennacl::matrix<T> vcl_Z =
viennacl::zero_matrix<T>(vcl_A.size1(),vcl_A.size2());

// subtract in-place
vcl_Z -= vcl_A;
vcl_A = vcl_Z;

Is there a more efficient way to approach this?  Allocating an additional
entire matrix is proving quite wasteful in some of my benchmarks.

Thanks,
Charles
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