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    <p><code>return(p)</code> in your script doesn't return a plot. <code>p</code> refers to each subset of the data frame <code>qq</code>. In general, to 'return' plots produced by <code>ggplot</code> inside functions you need to use <code>print</code> (see <a href="http://cran.r-project.org/doc/FAQ/R-FAQ.html#Why-do-lattice_002ftrellis-graphics-not-work_003f" rel="nofollow">FAQ 7.22</a>). However, in your particular case, where you want to save plots, you don't need <code>print</code>. </p> <p><strong>Several PDF files</strong></p> <p>If you want one file per level of 'SIC', you may try something like this. <code>d_ply</code> is useful when you call a function only for its side effects, like here when we save the output from a plot. Instead of <code>pdf</code>/<code>some-plotting</code>/<code>dev.off</code>, you may use <code>ggsave</code>.</p> <pre><code>d_ply(qq, .(SIC), function(p){ ggplot(p, aes(x = AVGAT, y = ADA, color = NLEAD)) + geom_point(shape = 1) ggsave(file = paste0(unique(p$SIC), ".pdf")) }) </code></pre> <p><strong>One PDF file with several pages</strong></p> <p>If you want one PDF file, with one page per level of 'SIC', you may use <code>base</code> function <code>pdf</code>, and the <code>.print = TRUE</code> argument in <code>d_ply</code>.</p> <pre><code># create a new SIC variable with two levels, for a more realistic test of the function qq$SIC2 &lt;- rep(c(50, 100), each = 10) pdf(file = "aaa.pdf") d_ply(qq, .(SIC2), .print = TRUE, function(p){ ggplot(p, aes(x = AVGAT, y = ADA, color = NLEAD)) + geom_point(shape = 1) }) dev.off() </code></pre>
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    1. COThanks! This solution works.
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    2. COBut the program is creating multiple files. I want to save only one pdf file with multiple graphs. If I use just one file name it just saves last file. Is there any way I can save multiple plots in one pdf file?
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    3. COIs there a way I can control the number of plots per page under the code you have provided? I want to plot 6 graphs per page. How can we use gridExtra to do that?
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