Set number of columns (or rows) in a facetted plot

ggplot2, r

Solution

You can use the `ncol` (or `nrow`) argument in `facet_wrap`:

ggplot(mtcars, aes(x = hp, y = mpg)) +
 geom_point()  +
 facet_wrap(~ carb, ncol = 3)

Problem

I have a facetted plot like this: ``` ggplot(mtcars, aes(x = hp, y = mpg)) + geom_point() + facet_grid(. ~ carb) ``` However, the graph is too wide to be clearly read. I'd like to be able to take the three rightmost locations and place them under the three leftmost, i.e. the facets should be in three columns * two rows like this. ``` 1 2 3 4 5 6 ``` Is it possible to set the layout of the facets, i.e. to set number of columns (or rows) with `facet_grid()`? The documentation on facet_grid doesn't seem to indicate that it's possible. Thanks for the help :-)

Original source