I would like to generate a vector having the same length as the number of rows in a matrix. The vector should contain an integer indicating the "group" of the row, where identical matrix rows are in a group, and a unique row has a unique integer. Thus, for
a <- c(1,2) b <- c(1,3) c <- c(1,2) d <- c(1,2) e <- c(1,3) f <- c(2,1) mat <- rbind(a,b,c,d,e,f) I would like to get the vector c(1,2,1,1,2,3). I know dist() gives part of the answer, but I can't figure out how to use it for this purpose without doing a lot of looping. I need to apply this to matrices up to ~100000 rows. Thanks, Scott Waichler Pacific Northwest National Laboratory scott.waichler_at_pnl.gov ______________________________________________ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
