On Wed, Jul 9, 2008 at 2:34 PM, Marlin Rowley <[EMAIL PROTECTED]> wrote:
> Thanks Chuck, but I wasn't quit clear with my question. > > You answered exactly according to what I asked, but I failed to mention > needing the dot product instead of just the product. > > So, > > v dot A = v' > > v'[0] = v[0]*A[0] + v[1]*A[1] + v[2]*A[2] > v'[1] = v[0]*A[3] + v[1]*A[4] + v[2]*A[5] > v'[2] = v[0]*A[6] + v[1]*A[7] + v[2]*A[8] > > There is no built in method for this specific problem (stacks of vectors and matrices), but you can make things work: sum(A.reshape((-1,3))*v, axis=1) You can do lots of interesting things using such manipulations and newaxis. For instance, multiplying stacks of matrices by stacks of matrices etc. I put up a post of such things once if you are interested. Chuck
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