Grid based; allows multiple plots arraged in a matrix and printed to
any R device. ggplot objects can be passed in ..., or to plotlist (as a list
of ggplot objects)
A numeric matrix specifying the layout. If present, 'cols' is
ignored.
Details
ggplot objects can be passed in ..., or to plotlist (as a list of
ggplot objects) If the layout is something like matrix(c(1,2,3,3), nrow=2,
byrow=TRUE), then plot 1 will go in the upper left, 2 will go in the upper
right, and 3 will go all the way across the bottom.