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R return corrplot as object

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 ?

like image 412
Jeff Avatar asked Jan 13 '15 18:01

Jeff


2 Answers

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)
like image 74
baptiste Avatar answered Oct 23 '22 15:10

baptiste


There's the old standby par(mfrow=c(x, y)) where x is the number of rows you wish to plot and y the numberof columns. It then posts across and then down as you call the plots.

par(mfrow = c(2, 2))
corrplot(cor(mat1))
corrplot(cor(mat2))
corrplot(cor(mat3))
corrplot(cor(mat4))

par(mfrow = c(1, 1)) #To clear layout

Will plot as

Mat1 | Mat2
-----------
Mat3 | Mat4
like image 38
Avraham Avatar answered Oct 23 '22 13:10

Avraham