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copied!<p>You can do it with <code>ggplot2</code>, using <code>facets</code>. When I read <em>"I want to create a plot where the data points are grouped as defined by the factor"</em>, the first thing that came to my mind was <code>facets</code>.</p> <p>But in this particular case, faster alternative should be:</p> <pre><code>plot(as.numeric(trans.factor), casp6) </code></pre> <p>And you can play with plot options afterwards (<code>type</code>, <code>fg</code>, <code>bg</code>...), but I recommend sticking with <code>ggplot2</code>, since it has much cleaner code, great functionality, you can avoid overplotting... etc. etc.</p> <p>Learn how to deal with factors. You got barplot when evaluating <code>plot(trans.factor, casp6)</code> 'cause <code>trans.factor</code> was class of <code>factor</code> (ironically, you even named it in such manor)... and <code>trans.factor</code>, as such, was declared <strong>before</strong> a continuous (numeric) variable within <code>plot()</code> function... hence <code>plot()</code> "feels" the need to subset data and draw boxplot based on each part (if you declare continuous variable first, you'll get an ordinary graph, right?). <code>ggplot2</code>, on the other hand, interprets factor in a different way... as <em>"an ordinary"</em>, numeric variable (this stands for syntax provided by <em>Jonathan Chang</em>, you must specify <code>geom</code> when doing something more complex in <code>ggplot2</code>).</p> <p>But, let's presuppose that you have one continuous variable and a factor, and you want to apply histogram on each part of continuous variable, defined by factor levels. This is where the things become complicated with base graph capabilities.</p> <pre><code># create dummy data > set.seed(23) > x <- rnorm(200, 23, 2.3) > g <- factor(round(runif(200, 1, 4))) </code></pre> <p>By using base graphs (<code>package:graphics</code>):</p> <pre><code>par(mfrow = c(1, 4)) tapply(x, g, hist) </code></pre> <p>ggplot2 way:</p> <pre><code>qplot(x, facets = . ~ g) </code></pre> <p>Try to do this with <code>graphics</code> in one line of code (semicolons and custom functions are considered cheating!):</p> <pre><code>qplot(x, log(x), facets = . ~ g) </code></pre> <p>Let's hope that I haven't bored you to death, but helped you!</p> <p>Kind regards,<br> <em>aL3xa</em></p>

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