[Numpy-discussion] Fast vector multiplication
Mark Janikas
mjanikas at esri.com
Fri Jan 19 16:40:32 CST 2007
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.
Mark Janikas
Product Engineer
ESRI, Geoprocessing
380 New York St.
Redlands, CA 92373
909-793-2853 (2563)
mjanikas at esri.com
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