ggplot2: Add name of variable used for facet_grid

Question

require(ggplot2)
ggplot(mtcars, aes(mpg, wt)) + geom_point() + facet_grid(vs+gear ~ cyl+am)

I would like to add the name of the 4 variables used for facet_grid on this graph. I suppose the best way to do so would be to add the name of the variables in the corners with a small arrow pointing to the row or column. I was thinking to use annotation_custom and textGrob for this purpose but failed to get anything printed on the graph.

Have you looked at `facet_grid(vs+gear ~ cyl+am, labeller = label_both)`? Not quite the same, but gets the info on the graph. — aosmith, Sep 16 '16 at 18:45

score 7 · Accepted Answer · answered Sep 16 '16 at 19:02

7

Something like this?

ggplot(mtcars, aes(mpg, wt)) + geom_point() + facet_grid(vs+gear ~ cyl+am,labeller = labeller(.rows = label_both, .cols = label_both))

You can also use syntax like so:

labeller = label_bquote("Gear"==.(gear))

answered Sep 16 '16 at 19:02

Dan Slone

543
2
8

Not quite what I was trying to do but that will work fine! Thank you – Remi.b Sep 16 '16 at 21:46

ggplot2: Add name of variable used for facet_grid

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