If you mean to put a check in to see if the file exists then something
like this would work:
for(i in 1:3){
aFile <- paste("file", i, ".dat", sep = "")
if(file.exists(aFile) == T){
bb <- read.table(aFile, header = F)
x11()
plot(bb)
dev.off()
}
}
If you mean that you want to check to see that it has data in it you
could ammend the if statement to something like
if(nrow(aFile) > 0)...
HTH, Andy
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