Places zeroes to the left of a string. If the string
consists only of digits 0-9, pad() does not change the value of
the string if interpreted as a numeric.
Usage
pad(x,len,padchar="0",strict=TRUE)
Arguments
x
Input argument (converted to character)
len
Desired length of output
padchar
Character to pad x with, defaulting to 0.
strict
Boolean variable governing the behaviour when length of
x is less than len. Under these circumstances, if
strict takes the default value of TRUE, then
return an error; if FALSE,