From: Murali Menon <feanor0_at_hotmail.com>

Date: Wed, 02 Jul 2008 16:30:46 +0000

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https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. Received on Wed 02 Jul 2008 - 20:34:10 GMT

Date: Wed, 02 Jul 2008 16:30:46 +0000

folks,

is there a clever way to compute the sum of the product of two vectors such that the common indices are not multiplied together?

i.e. if i have vectors X, Y, how can i compute

Sum (X[i] * Y[j])

i != j

where i != j

also, what if i wanted

Sum (X[i] * Y[j] * R[i, j])

i != j

where R is a matrix?

thanks,

murali

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