On 13-09-2012, at 10:42, Gian Maria Niccolò Benucci wrote: > Hi all, > > I am wondering if do exist a function in R that allow me to sample or > choose randomly the rows (i.e., samples) inside a given matrix.
Use sample. Like this for example A <- matrix(runif(8*4), nrow=8) A select.row <- sample(1:nrow(A), size= nrow(A)/3, replace=FALSE) select.row A[select.row,] Berend ______________________________________________ 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.
