R adding word in the middle of grid arrange - r

Question

I am writing R ggplot, and I am arranging multiple plots with grid.arrange.
Is there a way to add some words in in between two plots?
I want the output to be like the red word.
Thank you for your help :)
library(ggplot2)
library(gridExtra)
P1 <- ggplot(mtcars, aes(x = mpg)) +
geom_histogram()
P2 <- ggplot(mtcars, aes(x = wt)) +
geom_histogram()
grid.arrange(P1, *I want to add some information here*,P2, ncol = 1, nrow = 2)

Answer 1

You could use the grid.text function from grid library as follows
### Libraries
library(grid)
library(ggplot2)
library(gridExtra)
### Data
data(cars)
### Initiating plots
P1 <- ggplot(mtcars, aes(x = mpg)) +
geom_histogram()
P2 <- ggplot(mtcars, aes(x = wt)) +
geom_histogram()
### Display plots
grid.arrange(P1, P2, ncol = 1, nrow = 2)+
grid.text("I want to add some information here",
x=unit(0.25, "npc"),
y=unit(.52, "npc"),
gp=gpar(fontsize=20, col="red"))

Answer 2

One approach would be to create another ggplot with only text that you want and use it in cowplot::plot_grid
library(ggplot2)
P1 <- ggplot(mtcars, aes(x = mpg)) + geom_histogram()
P2 <- ggplot() +
annotate("text", x = 4, y = 25, size=8,
label = "This is some text in the middle", color = "red") +
theme_void()
P3 <- ggplot(mtcars, aes(x = wt)) + geom_histogram()
cowplot::plot_grid(P1, P2, P3, rel_heights = c(1/2, 1/12, 1/2),
align = "v", nrow = 3)