library(gridExtra)
library(grid)
library(ggplot2)
library(lattice)
p <- qplot(1,1)
g = arrangeGrob( p,p,p,p , nrow = 2, ncol = 2 )
grid.arrange( g )
lay = rbind( c(1,1)
,c(2,3)
)
g = arrangeGrob( p,p,p , layout_matrix = lay )
grid.arrange( g , main = 'Main Title')
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