Using format to add leading zeroes

sprintf("%04d",15)

I have a numerical vector which contains a (poorly) formatted time column,
which, in theory, should be HHMM, but was distributed as an integer, so, for
12:15 am, it is saved as "15" (e.g. HHMM = 0015 with the zeroes stripped).
?I'm trying to use this in conjunction with strptime, but I'm thinking
because each time is an integer ranging from 1 to 4 digits, I probably need
to coerce this vector using "format" first to add back the leading zeroes --
but I can't seem to figure out the specific parameters to send to format().
?Thoughts? ?I could use the pad0 function in PBSmodelling, but it seems to
only work on one item at a time (not an entire vector) so I thought I'd ask
here if there's an easy trick to getting where I need to go using on the
base package and not needing to write a for-next loop to implement pad0.

Thanks!

--j

--

Jonathan A. Greenberg, PhD
Postdoctoral Scholar
Center for Spatial Technologies and Remote Sensing (CSTARS)
University of California, Davis
One Shields Avenue
The Barn, Room 250N
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AIM: jgrn307, MSN: jgrn307 at hotmail.com, Gchat: jgrn307