multiplot: Multiple plot function
In 0liver0815/onc-crmpack-test: Object-Oriented Implementation of CRM Designs

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.

1	multiplot(..., plotlist = NULL, rows = 1, layout = NULL)

`...`	Objects to be passed
`plotlist`	a list of additional objects
`rows`	Number of rows in layout
`layout`	A matrix specifying the layout. If present, `rows` is ignored.