[R] From strings to numbers

From: Naira <nanao_at_psb.ugent.be>
Date: Mon, 19 May 2008 03:13:09 -0700 (PDT)

Dear all,

I would like to know if there is an easy to transform a vector of strings to a vector of integers.
("ab","ab","bb","cat","cat","ab") will be
(1, 1, 2, 3, 3, 1)


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