On 1/19/07, Mark Janikas <[EMAIL PROTECTED]> wrote:
Hello all, I am trying to figure out the most efficient way to get the sum of the product of two vectors where id != id. E.g.: X = array([1,2,3]) Y = array([1,2,3]) Z = (1*2) + (1*3) + (2*1) + (2*3) + (3*1) + (3*2) = 22 I could obviously do this with loops, but I was wondering if there is a version of multiply that could be used… or a form of vectorize. Any ideas would be greatly appreciated.
Isn't this just equivalent to: sum(X) * sum(Y) - dot(X, Y) ? If so, I would just use that. -- //=][=\\ [EMAIL PROTECTED]
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