Off topic:Rename Files In Subfolders In R

Question

[Jason]

I have a folder "Samples" with sub-folders named "A01" to "A11". Each folder contains 2 files i.e. probes.txt and snps.txt. I want to write a code that reads the subfolders names, go into each subfolder and rename the 2 text files with the subfolder name in it e.g. A01_probes.txt

I wrote this code and R and I can't work out what's the problem. For me, the length of both "from" and "to" are same!

Help!

---

for (i in 1:length(b))
{
  setwd(b[i])
  vr1<-cat(basename(b[i]),"pro.txt",sep="")
  vr2<-cat(basename(b[i]),"s.txt",sep="")
  file.rename("probes.txt",paste(vr1))
  file.rename("snps.txt",paste(vr2))
}

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Error in file.rename("probes.txt", paste(vr1)) : 'from' and 'to' are of different lengths