ggplot facet spanning on several cols

Question

Is there a way to get ggplot2::facet_wrap() to have a facet span on several rows?

I'm thinking of something very similar to what could be achieved with {patchwork} (example).

Here is a very lame example with 3 facets:

library(tidyverse) mtcars %>% select(cyl, am, gear, carb) %>% pivot_longer(-cyl) %>% ggplot(aes(fill=name, x=value)) + geom_bar(position="dodge") + facet_wrap("cyl", scale="free")

^{Created on 2021-07-05 by the reprex package (v2.0.0)}

In this example, how could I have these facets on 2 rows with first cyl==4&6 on 1 column each, and then cyl==8 which would span on 2 columns?

Here is my expected output (beware of my mighty MS Paint skills):

This may be of some help

akrun
– akrun

2021-07-05 19:57:10 +00:00
Commented Jul 5, 2021 at 19:57 — akrun
– akrun, Commented Jul 5, 2021 at 19:57

teunbrand · Accepted Answer · 2021-07-13 18:15:04Z

I've recently put up a manual facets function in ggh4x on github. It allows you to do pretty much exactly what your expected output looks like. (disclaimer: I'm the author of ggh4x)

library(tidyverse) library(ggh4x) # devtools::install_github("teunbrand/ggh4x") mtcars %>% select(cyl, am, gear, carb) %>% pivot_longer(-cyl) %>% ggplot(aes(fill=name, x=value)) + geom_bar(position="dodge") + facet_manual("cyl", scale="free", design = matrix(c(1,3,2,3), 2, 2))

^{Created on 2021-07-13 by the reprex package (v1.0.0)}

P.S. because this facet function is new, it might have some bugs I'm unaware of. Please let me know if you find some.

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