search for: lacuna

...g the calculation of the full symmetric matrices XX'. The trivial non-optimal approach boils down to something like: Q <- matrix(rnorm(100000),ncol=200) M <- matrix(0,ncol=200,nrow=200) for (i in 1:nrow(Q)) M <- M + tcrossprod(Q[i,]) I would appreciate pointers to help me fill this lacuna in my R skills :) Cheers, Tsjerk -- Tsjerk A. Wassenaar, Ph.D. post-doctoral researcher Molecular Dynamics Group * Groningen Institute for Biomolecular Research and Biotechnology * Zernike Institute for Advanced Materials University of Groningen The Netherlands

Hi there =20 I use Gnu R sometimes at work.=20 =20 Unfortunately we use Windows and R has problems with getting the calendar week number with the first week as the one which has at least 4 days. A colleague told me that he has the same problem.=20 =20 Below you can see what I use now, for finding the right week.=20 =20 =20 Kind regards,=20 Samuel Andreas Meichtry =20 =20

Hello, I'm hoping someone with a wide experience with R may be able to see what the program is trying to tell me. I've got an array: y1=rnorm(41,0.2) y2=rnorm(41,0.2) y3=rbind(y1,y2) data11<-array(0,c(41,2,2)) data11[,1,]=y3 data11[,2,]=y3 rownames(data11)<-rownames(data11, do.NULL = FALSE, prefix = "Obs.") colnames=c("V","R")