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    <p>I think that what you are looking for is the <a href="http://stat.ethz.ch/R-manual/R-patched/library/base/html/sprintf.html" rel="nofollow"><strong>sprintf()</strong></a> function...<br> <code>sprintf</code> will save you from having the tests on n, to known how many leading zeros are needed.<br> Combined with the <a href="http://stat.ethz.ch/R-manual/R-patched/library/base/html/paste.html" rel="nofollow"><strong>paste()</strong> or <strong>paste0</strong></a> function, producing the desired file name becomes a one-liner.<br> Indeed it would be possibly to just use the sprintf() function alone, as in<br> <code>sprintf("intersections_track_calibrated_jma_from1951_%04d.csv", n)</code> but having a function to produce the file names and/or the "TrakID" may allow to hide all these file naming convention details away.</p> <p>Below, see sprintf() and paste0() in action, in the context of a convenience function created to produce the filename given a number n.</p> <pre><code>&gt; GetFileName &lt;- function(n) paste0("intersections_track_calibrated_jma_from1951_", sprintf("%04d", n), ".csv") &gt; GetFileName(1) [1] "intersections_track_calibrated_jma_from1951_0001.csv" &gt; GetFileName(13) [1] "intersections_track_calibrated_jma_from1951_0013.csv" &gt; GetFileName(321) [1] "intersections_track_calibrated_jma_from1951_0321.csv" &gt; </code></pre> <p>Of course, you could make the GetFileName function more versatile by adding parameters, some of which with a default value. In that fashion it could be used for both input and output file name (or any other file prefix/extension). For example:</p> <pre><code>GetFileName &lt;- function(n, prefix=NA, ext="csv") { if (is.na(prefix)) { prefix &lt;- "intersections_track_calibrated_jma_from1951_" } paste0(prefix, sprintf("%04d", n), ".", ext) } &gt; GetFileName(12) [1] "intersections_track_calibrated_jma_from1951_0012.csv" &gt; GetFileName(12, "output/tracks_crossing_regional_polygon_", "txt") [1] "output/tracks_crossing_regional_polygon_0012.txt" &gt; GetFileName(12, "output/tracks_crossing_regional_polygon_") [1] "output/tracks_crossing_regional_polygon_0012.csv" &gt; </code></pre>
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    1. CO+1 sprintf() is a much cleaner solution here.
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      1. USBrandon Bertelsen
 

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