multiplot: Multiple plot function
In mssm-msf-2019/BiostatsALL:

Description Usage Arguments

If the layout is something like matrix(c(1,2,3,3), nrow=2, by.row=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, file, cols = 1, layout = NULL)

`ggplot`	objects can be passed in ..., or to plotlist (as a list of ggplot objects)
`cols:`	Number of columns in layout
`layout:`	A matrix specifying the layout. If present, 'cols' is ignored.