thank you Mr. Carlson you're right, the matrix that I used as an example does not make sense. When I built the array I was not thinking of the formula s[n]=1+s[n]+rnorm(1,mean=0,sd=1), I just wanted to give an example of the structure of the matrix that I needed.
Anyway I think you have solved my simple problem. thank you for availability !! Cesare -- View this message in context: http://r.789695.n4.nabble.com/double-for-cycle-tp4636916p4636988.html Sent from the R help mailing list archive at Nabble.com. ______________________________________________ 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.