Multiple plot function ggplot objects can be passed in ..., or to plotlist (as a list of ggplot objects)
multiplot(..., plotlist = NULL, file, cols = 1, layout = NULL)
polts seperated by ','
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.
A list of plots.
A file to save to??..
Number of columns in layout
A matrix specifying the layout. If present, 'cols' is ignored.
A function adapted from Winston Chang, 'R Graphics Cookbook'.