my loop only works for the last file R -


only last file in list of text files produces pdf. not sure why?

files <- (sys.glob("/users/local/documents/*segmentcn.txt"))  (i in length(files)) {      y <- read.table(files[i], header=true)      cn1m0 <- subset(y, subset=(mcn == 0 & cn == 1), select = c("log2", "imba"))      pdf(file = paste(files[i], ".pdf", sep=""))     plot(cn1m0$log2, cn1m0$imba, col=128, xlim=c(-1, 1), ylim=c(0,1))     points(mean(cn1m0$log2), mean(cn1m0$imba), pch = 3, col="red")      dev.off() }

the problem length(files) outputs length of list, you're taking last file.

try

for (i in 1:length(files))

or more safe:

for (i in seq(along = files))

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