add zero in front of numbers

Dear Yan,

apart from formatC, you can also use sprintf, which works almost
exactly like the C sprintf function. To convert an integer x to a
string with 5 leading 0s, you do:

sprintf( "%05d", x )

Best regards,

j.

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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