r - How to use with plot_grid from cowplot -


i want combine several ggplot2 charts 1 using cowplot::plot_grid(). documentation:

?plot arguments  ...  list of plots arranged grid. plots can objects of 1 of following classes: ggplot, recordedplot, gtable, or alternative can function creating plot when called (see examples).

so, if input list of ggplot2 objects plot_grid(), should combine plots one, right?

so why won't work? 

p1 <- ggplot(mpg, aes(x = cty, y = hwy, colour = factor(cyl))) +    geom_point(size=2.5)  p2 <- ggplot(diamonds, aes(clarity, fill = cut)) + geom_bar() +   theme(axis.text.x = element_text(angle=70, vjust=0.5))  list(p1, p2) %>%    map(plot_grid)

see documentation of map (?map), states that:

.x     list or atomic vector.  .f     function, formula, or atomic vector.

it means function provided .f applied every elements in .x. following code

list(p1, p2) %>% map(plot_grid)

is same following code

plot_grid(p1) plot_grid(p2)

,which not want.

what want this

plot_grid(p1, p2)

or this

plot_grid(plotlist = list(p1, p2))

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