Re: fastest way to element-by-element multiply matix by vector?

[Ozzy Lash]

On 6/19/07, Michael Creel <address@hidden> wrote:
> Hello all,
> I need to element-by-element multiply an nXk matrix A by an nX1 vector b, so
> that the result is that each row of A is multiplied by the corresponding row of
> b. This is on the inside loop of some intense calculations, so I'd like the best
> performance. Is C = A .* repmat(b,1,k) the best way to do this?
> Thanks, Michael

The only other way I can think of is:

C = diag(b) * A

Not sure which would be faster, replication and element by element
multiply or diagonalization and matrix multiply.

Bill