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)
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
Robert Kern wrote:
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()
I guess that's the same as np.outer (x, y).sum() ?
participants (3)
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Charles R Harris -
Neal Becker -
Robert Kern