search for: tp25530977p25530977

...ing this to generate a X'X matrix (since I can?t do t(X)$*$X because i would like to include a conditional in the formula. Threrefore this script above is not good to me) Could anybody help me? Thanks in advance -- View this message in context: http://www.nabble.com/Sum-of-Product-in-a-Matrix-tp25530977p25530977.html Sent from the R help mailing list archive at Nabble.com.