Getting rid of facet_grid labels on those gray boxes?

Question

What I'd like it's to remove those labels on the right side, the ones on gray boxes on the side. I'll give an example:

p <- ggplot(mtcars, aes(mpg, wt, col=factor(cyl))) + geom_point()
p + facet_grid(cyl ~ .)

Thanks in advance!

Juan

Answer 1

The following would do that:

p <- ggplot(mtcars, aes(mpg, wt, col=factor(cyl))) + geom_point()
p <- p + facet_grid(cyl ~ .)
p <- p +theme(strip.text.y = element_blank())

Without rectangles

p <- ggplot(mtcars, aes(mpg, wt, col=factor(cyl))) + geom_point()
p <- p + facet_grid(cyl ~ .)
p <- p + theme(strip.background = element_blank(),
   strip.text.y = element_blank())