[R] add zero in front of numbers

From: Yan Jiao <y.jiao_at_ucl.ac.uk>
Date: Mon, 04 Apr 2011 11:35:51 +0100

Dear R users,

I need to add 0 in front of a series of numbers, e.g. 1->001, 19->019, Is there a fast way of doing that?

Many thanks


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