I'm sorry: sum(v1 %o% v2 - diag(v1*v2))
On Wed, Jul 2, 2008 at 6:03 PM, Henrique Dallazuanna <[EMAIL PROTECTED]> wrote: > Try something about like this: > > v1 %o% v2 - diag(v1*v2) > > On Wed, Jul 2, 2008 at 1:30 PM, Murali Menon <[EMAIL PROTECTED]> wrote: > >> >> 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 >> >> >> _________________________________________________________________ >> Enter the Zune-A-Day Giveaway for your chance to win day after day after >> day >> >> M_Mobile_Zune_V1 >> [[alternative HTML version deleted]] >> >> >> ______________________________________________ >> R-help@r-project.org mailing list >> 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. >> >> > > > -- > Henrique Dallazuanna > Curitiba-Paraná-Brasil > 25° 25' 40" S 49° 16' 22" O -- Henrique Dallazuanna Curitiba-Paraná-Brasil 25° 25' 40" S 49° 16' 22" O [[alternative HTML version deleted]]
______________________________________________ R-help@r-project.org mailing list 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.
