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simple vactor magitude question


Suppose I generate a 1-d vecctor of "N" numbers, p[i], and now I want to
find the sum of (the vector element * index).  I think the syntax should look
something like,

Sum[p[i]*i,{i,0,N}]

but this doesn't seem to be the correct syntax - any help would be
appreciated.

Nathan Moore,
University of Minnesota Physics


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