Hey Josh, Thank you so much for the help!
Now I have edited my codes--breaking into smaller pieces:) R does not state the error again:) However, the problem comes, please see my codes below-- You've suggested earlier that I should move the "eight" part outside the loop; I changed the "eight" into "temp.dat", because I wanted the codes and functions to work on every file. In order to include it into the loop, I renamed it into this general name "temp.dat". The codes work--in the way that they generates plots and csv files-- BUT, they somehow produce exactly the same plots and csv files (for the number/length of my.files). I think the problem has to do with the way I named the files, i.e."temp.dat". Is it wrong to name it like that? How should I name it so that R produces the result desired? I also tried naming them "i", but it doesn't work. I believe it's just one last small step towards success, but I couldn't figure it out. Please help me:) Thanks a lot in advance!! my.files <- list.files() for (i in 1: length(my.files)) { temp.dat <- read.csv(my.files[i], header=TRUE, sep=",")} for (i in 1: length(my.files)){ temp.datout <- subset(temp.dat, inout=="Outgoing from panel hh" & o_duration>0, select=c(inout, enc_callee, o_duration)) } for (i in 1: length(my.files)){ f <- function(temp.datoutf) nrow(temp.datoutf) temp.datnocalls <- ddply(temp.datout,.(enc_callee),f) colnames(temp.datnocalls)[2] <- "nocalls" temp.datout$nocalls <- temp.datnocalls$nocalls [match(temp.datout$enc_callee, temp.datnocalls$enc_callee)] temp.datout=data.frame(temp.datout,"time"=c(1:nrow(temp.datout))) } for (i in 1: length(my.files)){ png(paste(Sys.Date(),"_",my.files[i],"_.png", sep="")) plot(temp.datout$time, temp.datout$nocalls, main=my.files[i]) dev.off() write.csv(temp.datout, paste(Sys.Date(),"_",my.files[i],"_.csv", sep=""), row.names=FALSE) } -- View this message in context: http://r.789695.n4.nabble.com/What-s-wrong-with-my-code-Edited-version-added-my-data-tp3662910p3663933.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.