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

Question

I\'ve been reading the ggplot2 documentation for both functions. I was wondering what were the differences and what would be right situation for using each func

Answer 1

For single variable plots you can use either facet_grid() or facet_wrap().

facet_wrap(~variable) will return a symmetrical matrix of plots for the number of levels of variable.

facet_grid(.~variable) will return facets equal to the levels of variable distributed horizontally.

facet_grid(variable~.) will return facets equal to the levels of variable distributed vertically.