search for: whichid

...le to use 2 loops to do the normalization, however, as 2 loops took a long time for the calculation, I don't know whether there's a better way to do it. I have the following code with only 1 loop, but it did not work. Can anyone help with this? Thanks, IDS <- unique(data.frame$ID) for(WhichID in IDS) { subset <- data.frame[,"ID"] == WhichID DVREAL <- data.frame[subset,"DV"] DVNORM[WhichID] <- DVREAL/DVREAL[1] } -- View this message in context: http://r.789695.n4.nabble.com/data-normalization-tp4633911.html Sent from the R help mailing list archive at...

...012, i.e., the first two digits padded to the left by a zero, followed by a dash, followed by the final three digits, also padded to the left by zeros. I can do this with brute force: FirstPart <- sprintf("%03d", floor(Number / 1000)) SecondPart <- sprintf("%03d", WhichID %% 1000) Combined <- paste(FirstPart, "-", SecondPart, sep="") But, I suspect that there is some more clever means to accomplish this using formatC or sprintf. Unfortunately, the help pages don't provide sufficient insight. I would appreciate any tricks to accom...