What’s the difference between facet_wrap() and facet_grid() in ggplot2?

The answer below refers to the case when you have 2 arguments in facet_grid() or facet_wrap().

facet_grid(x ~ y) will display x*y plots even if some plots are empty. Ex:

library(ggplot2)
g <- ggplot(mpg, aes(displ, hwy))

There are 4 distinct cyl and 7 distinct class values.

g + geom_point(alpha=1/3) + facet_grid(cyl~class)

The above displays 4 * 7 = 28 plots, even if some are empty (because some classes do not have corresponding cylinder values, like rows with class=”midsize” doesn’t have any corresponding cyl=”5″ value ) facet_wrap(x ~ y) on the other hand, displays only the plots having actual values.

g + geom_point(alpha=1/3) + facet_wrap(cyl~class)

There are 19 plots displayed now, one for every combination of cyl and class.

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