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    <p><em>Update</em>:</p> <ul> <li><strong>.R files:</strong> <code>source</code>'s option <code>print.eval=TRUE</code> will lead to printing behaviour of the evaluation result like in the interactive command line.</li> </ul> <blockquote> <p><code>source("Script.R", print.eval=TRUE)</code></p> </blockquote> <ul> <li><strong>.Rnw files:</strong> <code>knitr</code> by default emulates the behaviour of the interactive command line wrt. <code>print</code>ing. Note that <code>knitr</code> can be specified as Sweaving engine also for R package vignettes.</li> </ul> <p><hr> <em>This is my original answer. But note that this workaround is IMHO completely obsolete now (and it always was good for a small lazy niche only).</em></p> <p>This is the famous <a href="http://cran.r-project.org/doc/FAQ/R-FAQ.html#Why-do-lattice_002ftrellis-graphics-not-work_003f" rel="noreferrer">FAQ 7.22: Why do lattice/trellis graphics not work?</a>.</p> <p>For grid graphics like ggplot2 or lattice, you need to print the graphics object in order to actually draw it. </p> <p>Interactively on the command line this is done automatically. Everywhere else (inside files to be sourced, loops, functions, Sweave chunks) you need to print it explicitly.</p> <pre><code>print (qplot (1 : 10, 1 : 10)) </code></pre> <p>Alternatively, you can redefine <code>qplot</code> to do the printing:</p> <pre><code>qplot &lt;- function (x, y = NULL, z = NULL, ...) { p &lt;- ggplot2::qplot (x = x, y = y, z = z, ...) print (p) } </code></pre> <p>(this changes the axis labels to x and y).</p> <p>I use this approach in vignettes where I want to write code exactly as a user in an interactive session would type it.</p>
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    1. USTravis Heeter
    1. UScbeleites
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    1. COBeautiful, thank you for your fast response.
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      1. USGrega Kešpret
    2. COOr use echo = T in source
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      1. UShadley
    3. COMinor point: you don't need `invisible(p)` since `print(p)` returns `p`.
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      1. USRichie Cotton
 

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