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POHow can I make a legend in ggplot2 with one point entry and one line entry?
 

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  1. POHow can I make a legend in ggplot2 with one point entry and one line entry?
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    <p>I am making a graph in ggplot2 consisting of a set of datapoints plotted as points, with the lines predicted by a fitted model overlaid. The general idea of the graph looks something like this:</p> <pre><code>names &lt;- c(1,1,1,2,2,2,3,3,3) xvals &lt;- c(1:9) yvals &lt;- c(1,2,3,10,11,12,15,16,17) pvals &lt;- c(1.1,2.1,3.1,11,12,13,14,15,16) ex_data &lt;- data.frame(names,xvals,yvals,pvals) ex_data$names &lt;- factor(ex_data$names) graph &lt;- ggplot(data=ex_data, aes(x=xvals, y=yvals, color=names)) print(graph + geom_point() + geom_line(aes(x=xvals, y=pvals))) </code></pre> <p>As you can see, both the lines and the points are colored by a categorical variable ('names' in this case). I would like the legend to contain 2 entries: a dot labeled 'Data', and a line labeled 'Fitted' (to denote that the dots are real data and the lines are fits). However, I cannot seem to get this to work. The (awesome) guide <a href="https://ggplot2.googlegroups.com/attach/916e6043b542b18d/ggplot2+4-1.pdf?gda=g9BDfUYAAAC5f3CzYMX3kmL-sjw03IF9PQERITrZJ7UznEaWnA97Soz8LCmTqTlzbSx9FGDKxIVx40jamwa1UURqDcgHarKEE-Ea7GxYMt0t6nY0uV5FIQ&amp;view=1&amp;part=2" rel="nofollow noreferrer">here</a> is great for formatting, but doesn't deal with the actual entries, while I have tried the technique <a href="https://stackoverflow.com/questions/2253179/using-ggplot2-how-can-i-represent-a-dot-and-a-line-in-the-legend">here</a> to no avail, i.e.</p> <pre><code>print(graph + scale_colour_manual("", values=c("green", "blue", "red")) + scale_shape_manual("", values=c(19,NA,NA)) + scale_linetype_manual("",values=c(0,1,1))) </code></pre> <p>The main trouble is that, in my actual data, there are >200 different categories for 'names,' while I only want the 2 entries I mentioned above in the legend. Doing this with my actual data just produces a meaningless legend that runs off the page, because the legend is trying to be a key for the colors (of which I have way too many).</p> <p>I'd appreciate any help!</p>
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