[R] paste function by INDICES

From: Massimiliano Tripoli <massimiliano.tripoli_at_gmail.com>
Date: Wed, 27 Apr 2011 16:34:51 +0200

Dear all,
I have the following R dataframe:

   (df <- data.frame(ID=rep(1:10,1:10),a=factor(sample(1:4,55,rep=T)) ))    where ID is an identification code.
   I need to create a new variable "b" in which I would paste the full group of "a" variable according to ID variable.

   For example for ID=2 "b" should be 13, for ID=3 "b" should be 114, and for ID=4 should be 1241.
  How can I do that ?
  Thank you for any advices,
   Massimiliano Tripoli

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