Putting a legend in each facet

Asked May 14 '13 at 14:27

Active May 14 '13 at 14:27

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I am making a faceted ggplot graphic and would like to put a legend in each facet. For example, if I have the following plot, how could I make a legend in each facet corresponding to the lines that are contained within each facet (instead of one legend as it exists)?

data(mpg)

ggplot(mpg, aes(year, cty, group=manufacturer)) +
  geom_line(aes(colour=manufacturer)) + facet_grid(.~drv)

enter image description here

The only solution I can come up with is to make three seperate plots using subsets. Is there a solution using facet_grid()?

asked May 14 '13 at 14:27

smillig

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I would use `gridExtra`'s `grid.arrange`. – Roman Luštrik May 14 '13 at 14:29
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not exactly what you're after, but looking at this graph I would suggest the directlabels package to annotate the lines directly in the panels. – baptiste May 14 '13 at 14:30

Putting a legend in each facet

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