p <- ggplot(mtcars, aes(mpg, wt))
p + geom_point()+facet_grid(cyl ~ vs)+theme_bw()
I would like to make the panel (1 vs 8 in the lower right hand corner) blank where no data points are shown, but at the same time, I would like to keep this arrangement.
so facet_wrap(cyl ~ vs) could not solve my problem.
maybe more general question is that is it possible to arrange each panel in ggplot2?