add leading 0s to %d from png() {was Automatic creation of file names}

Dear useRs,

Is there a way to 'properly' format %d when plotting more than one
page on png()? 'Properly' means to me with leading 0s, so that the
PNGs become easy to navigate in a file/image browser. Lacking a better
solution I ended up using the code below, but would much prefer
something like
  png("test_%d.png",bg="white",width=1000,height=700)
where %d could be formatted like
  formatC(%d,digits=0,wid=3,flag="0",mode="integer")

Thank you,
b.

#---works, but is rather complicated---
pngno <- 0 ; i <- 1
for (w in 1:53) {
 if (i %in% c(4*0:100+1)) {
   pngno <- pngno + 1
   png(paste("test_",formatC(pngno,digits=0,wid=4,flag="0",mode="integer"),
     ".png",sep=""),bg="white",width=1000,height=750)
   par(mfrow=c(2,2),mai=c(4,5,3,2)/10,omi=c(0.2,0,0,0),
     cex.axis=1,cex.main=1.2)
   }
 plot(1:10,main=w)
 if (i %in% c(4*1:100)) dev.off()
 i <- i+1
 }
dev.off()

From: Mike Prager <Mike.Prager <at> noaa.gov>
Subject: Re: [R] Automatic creation of file names
Newsgroups: gmane.comp.lang.r.general
Date: 2005-09-22 14:51:54 GMT (2 weeks, 1 day, 23 hours and 55 minutes ago)

Walter --

P.S.  The advantage of using formatC over pasting the digits (1:1000)
directly is that when one uses leading zeroes, as in the formatC example
shown, the resulting filenames will sort into proper order.

...MHP

You can use paste() with something like

formatC(number,digits=0,wid=3,flag="0")

(where number is your loop index) to generate the filenames.

on 9/22/2005 10:21 AM Leite,Walter said the following:

I have a question about how to save to the hard drive the one thousand
datasets I generated in a simulation. ://www.R-project.org/posting-guide.html