Have a look at

?formatC

On Mon, Apr 4, 2011 at 11:35 AM, Yan Jiao <y.jiao@ucl.ac.uk> wrote:

> 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
>
> yan
>
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>
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> and provide commented, minimal, self-contained, reproducible code.
>

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