edit values

["jose Bartolomei" <surfprjab@hotmail.com>]

Dear S-Plus users,

I have a character column within a data set that has values with 7 and 8 
characters of length.
Which is your recommended way to add a ?0? at the left of those values with 
7 characters only?

Thanks in advance,
Jose
Research degree student
London School Hygiene & Tropical Medicine (LSHTM)