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    <h3>Any ggplots side-by-side (or n plots on a grid)</h3> <p>The function <code>grid.arrange()</code> in the <a href="https://cran.r-project.org/web/packages/gridExtra/index.html" rel="noreferrer"><code>gridExtra</code></a> package will combine multiple plots; this is how you put two side by side. </p> <pre><code>require(gridExtra) plot1 &lt;- qplot(1) plot2 &lt;- qplot(1) grid.arrange(plot1, plot2, ncol=2) </code></pre> <p>This is useful when the two plots are not based on the same data, for example if you want to plot different variables without using reshape(). </p> <p>This will plot the output as a side effect. To print the side effect to a file, specify a device driver (such as <code>pdf</code>, <code>png</code>, etc), e.g.</p> <pre><code>pdf("foo.pdf") grid.arrange(plot1, plot2) dev.off() </code></pre> <p>or, use <code>arrangeGrob()</code> in combination with <code>ggsave()</code>,</p> <pre><code>ggsave("foo.pdf", arrangeGrob(plot1, plot2)) </code></pre> <p>This is the equivalent of making two distinct plots using <code>par(mfrow = c(1,2))</code>. This not only saves time arranging data, it is necessary when you want two dissimilar plots.</p> <hr> <h3>Appendix: Using Facets</h3> <p>Facets are helpful for making similar plots for different groups. This is pointed out below in many answers below, but I want to highlight this approach with examples equivalent to the above plots. </p> <pre><code>mydata &lt;- data.frame(myGroup = c('a', 'b'), myX = c(1,1)) qplot(data = mydata, x = myX, facets = ~myGroup) ggplot(data = mydata) + geom_bar(aes(myX)) + facet_wrap(~myGroup) </code></pre> <hr> <h3>Update</h3> <p>the <code>plot_grid</code> function in the <a href="https://cran.r-project.org/web/packages/cowplot/index.html" rel="noreferrer"><code>cowplot</code></a> is worth checking out as an alternative to <code>grid.arrange</code>. See the <a href="https://stackoverflow.com/a/31223588/199217">answer</a> by @claus-wilke below and <a href="https://stackoverflow.com/a/31223588/199217">this vignette</a> for an equivalent approach; but the function allows finer controls on plot location and size, based on <a href="https://stackoverflow.com/a/31223588/199217">this vignette</a>. </p>
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    1. USDavid LeBauer
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    1. COWhen I ran your code using ggplot objects, sidebysideplot is null. If you want to save the output to a file, use gridArrange. See http://stackoverflow.com/questions/17059099/saving-grid-arrange-plot-to-file
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    2. CO@Jim thank you for pointing that out. I have revised my answer. Let me know if any questions remain.
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