plot - R return corrplot as object

Question

corrplot plots a correlation matrix, but it does not return a graphical object (grob)

I would like to plot several correlation matrices on a single page. For normal plots, I would use grid.arrange from the gridExtra package. However since corrplot only prints and does not return an object, I can't see how to do this.

Is there a workaround or a better alternative to corrplot ?

Answer 1

The recent gridGraphics package could probably do what you asked: return the plot as a grob.

mat <- matrix(rnorm(100), ncol=10)
library(corrplot)
corrplot(cor(mat))

library(gridGraphics)
grab_grob <- function(){
  grid.echo()
  grid.grab()
}

g <- grab_grob()
library(gridExtra)
grid.newpage()
grid.arrange(g,g,g,g)