Hi, I guess you just want to reshape your data to wide format.
strs <- "Index Time Value 1 2 0.1 2 3 0.2 3 1 0.3" DF <- read.table(textConnection(strs),header=T) rDF <- reshape(DF, idvar="Index", timevar="Time", direction="wide") rDF[is.na(rDF)] <- 0 ----- A R learner. -- View this message in context: http://r.789695.n4.nabble.com/matrix-problem-tp2320193p2320287.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.