How to specify columns in facet_grid OR how to change labels in facet_wrap

Question

I have a large number of data series that I want to plot using small multiples. A combination of ggplot2 and facet_wrap does what I want, typically resulting a

Answer 1

Just add labeller = label_wrap_gen(width = 25, multi_line = TRUE) to the facet_wrap() arguments.

Eg.: ... + facet_wrap( ~ variable, ,labeller = label_wrap_gen(width = 25, multi_line = TRUE))

More info: ?ggplot2::label_wrap_gen