Set margins between plots using multiplot

Question

To display multiple plots I use multiplot (http://www.cookbook-r.com/Graphs/Multiple_graphs_on_one_page_(ggplot2)/), now I have two plots who share the same x-axis range and are

Answer 1

The last update of ggplot2 gives much more control over the plot. See for example:

ggplot(mtcars, aes(disp, mpg)) +
     geom_point() +
     facet_wrap(~vs)

You can further adjust the labels, number of rows, and how scales will be displayed, for instance: nrow = 2; scales = "free".