Perhaps an easier coding that shows what I want would be this: > for(i in 1:nrow(ret)) { + retT=ret[1+i:252+i,]} Thank you so much for your time and help! -- View this message in context: http://r.789695.n4.nabble.com/Help-with-a-repeating-process-tp4634336p4634339.html Sent from the R help mailing list archive at Nabble.com.