[R] add leading zeros

[LCOG1]

Hi all, 
     Trying to use an apply to add leading zeros to a set of values in a
given vector.  I only want to add enough zeros so that the total number of
characters is 5, so if I have an element "1" i want "00001" or "9000" I want
"09000".  I tried 

vec <- 1:1000
sapply(vec, FUN = sprintf(paste("%0",(5-nchar(x)),"d",sep=""),x)) 

but she doesnt work.  I struggle with the apply family for sure.  Thanks

Josh 



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