June 20, 2012
3:01 p.m.
On Wed, Jun 20, 2012 at 3:58 PM, Neal Becker <ndbecker2@gmail.com> wrote:
Maybe I'm being slow, but is there any convenient function to calculate, for 2 vectors:
\sum_i \sum_j x_i y_j
(I had a matrix once, but it vanished without a trace)
np.multiply.outer(x, y).sum() -- Robert Kern