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I wonder how to add facet titles in ggplot2
ggplot(diamonds, aes(cut)) + geom_bar() + facet_grid(color ~ clarity)
and change the legend title
ggplot(diamonds, aes(cut, fill=cut)) + geom_bar() + facet_grid(. ~ clarity)
Thanks for your help.
888
You can use the following syntax to change the legend labels in ggplot2: p + scale_fill_discrete(labels=c('label1', 'label2', 'label3', ...))
You can place the legend literally anywhere. To put it around the chart, use the legend. position option and specify top , right , bottom , or left . To put it inside the plot area, specify a vector of length 2, both values going between 0 and 1 and giving the x and y coordinates.
The facet_grid() function will produce a grid of plots for each combination of variables that you specify, even if some plots are empty. The facet_wrap() function will only produce plots for the combinations of variables that have values, which means it won't produce any empty plots.
The facets are labeled using the levels of the factor used. So if you simply change the levels , such as
levels(diamonds$clarity) <- letters[1:8]
those facets will now be labeled using those letters. The legend title matches the label for that aesthetic mapping, which you can set via:
+ labs(fill = "Fill legend label")
As an extra tidbit, I've noticed that I can set the x and y axis labels to NULL in labs but not the legend titles; for those you use an empty character if you want no title.
Edit
Given your clarifications, you can add text outside the plotting area using grid.text:
print(qplot(1,1),vp = viewport(width = 0.9))
grid.text(unit(0.95,"npc"),0.5,label = "Right label", rot = 270)
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