Question

Hi I am using a solution that is on Cookbook for R to plot multiple ggplots in one go…i.e. the code from this bottom of the page on this link http://wiki.stdout.org/rcookbook/Graphs/Multiple%20graphs%20on%20one%20page%20(ggplot2)/

I would like to add an overall title to this plot but am not sure how to do it. i.e. I would like to be able to have an amended function that has the additional argument for title like the below

multiplot(..., plotlist=NULL, file, cols=1, layout=NULL, title="")

any help would be much appreciated

Answer 1

use the gridExtra library and the function grid.arrange to do this. Example:

 p1 <-qplot(factor(cyl), data=mtcars, geom="bar")
 library(gridExtra)
 grid.arrange(p1, p1, p1, p1, main = "Overall Title")

See ?grid.arrange for more options.