How to add a border around a chart created via arrange.grid in gridExtra encompassing a set ggplot2 scatter plots

Question

I\'m using the code below:

# Libs
require(ggplot2); require(gridExtra); require(grid)

# Generate separate charts
chrts_list_scts <- list()

# Data
data(\         


        

Answer 1

you can add a rectGrob to the gtable

grid.draw(gtable::gtable_add_grob(arrangeGrob(g, g, ncol=2),
             rectGrob(gp=gpar(lwd=5, fill=NA)), 1, 1, 1, 2))

NOTE: fill=NA or fill='transparent' is required otherwise the rectangle can mask the objects below it.