In base graphics I can create a 4 panel pane of graphics by doing the following:

par(mfrow=c(2,2))
for (i in 1:4){
  plot(density(rnorm(100)))
}

which results in

enter image description here

I'd like to do the same sort of thing with ggplot2, but I can't figure out how to do it. I can't use facets because my real data, unlike this trivial example, is in very different structures and I want two graphs to be point charts and two to be histograms. How can do create panels or panes in ggplot2?

r ggplot2
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