[R] vectorization of groups of dot products
Rossi, Peter E.
Peter.Rossi at chicagogsb.edu
Fri Jan 6 22:56:25 CET 2006
I have a set of n vectors, x_1, ..., x_n, of the same length.
I would like to form the vector of dot products -- x_1'x_1, ..., x_n'x_n
the fastest way I can think to do this is to put the vectors into a
however, this seems to be very wasteful since this computes n(n+1)/2-n
Is there a better way using existing functions in R?
Peter E. Rossi
Joseph T. and Bernice S. Lewis Professor of Marketing and Statistics
Editor, Quantitative Marketing and Economics
Rm 353, Graduate School of Business, U of Chicago
5807 S. Woodlawn Ave, Chicago IL 60637, USA
Tel: (773) 702-7513 | Fax: (773) 834-2081
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