Alan Thanks - I felt sure there had to be an easy idea. Best Tony On 02/19/2013 10:17 AM, Alan G Isaac wrote:

x=[1,2,3,4,5,6] ind=[1,3,9,3,4,1] f=np.zeros(10) np.bincount(ind,x)

hth, Alan Isaac

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-- Tony Ladd Chemical Engineering Department University of Florida Gainesville, Florida 32611-6005 USA Email: tladd-"(AT)"-che.ufl.edu Web http://ladd.che.ufl.edu Tel: (352)-392-6509 FAX: (352)-392-9514