multiplot: Multiple plot function Developed by Winston Chang
In tcspears/tcspeaRs:

Multiple plot function Developed by Winston Chang

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

`...`	ggplot objects to be plotted
`plotlist`	an optional list of ggplot objects to be plotted
`cols`	Number of columns in layout.
`layout`	A matrix specifying the layout. If present, 'cols' is ignored. 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.