Draw two plots in R with ggplot and par

Question

I start to study R. I'm starting with Iris dataset in the package datasets. To draw som graph I need to use the ggplot2 package. How can I split the Plots window and draw two graphs?

I try with the following code, but only one graph is showed.

iris=datasets::iris
par(mfrow=c(2,1))
ggplot(iris, aes(x=Sepal.Length,y=Sepal.Width,color=Species))+ geom_point(size=3)
ggplot(iris, aes(x=Petal.Length,y=Petal.Width,color=Species))+ geom_point(size=3)

Question has nothing to do with `machine-learning` - kindly do not spam the tag (removed). — desertnaut, Nov 12 '18 at 00:16
@xcesco: see this https://stackoverflow.com/a/48164920/786542 — Tung, Nov 12 '18 at 00:25

score 3 · Accepted Answer · answered Nov 12 '18 at 00:28

use win.graph() to split the window into two.

Since you have not provided dataset, if you want to create a side by side plot try based on my example below

Try this:

library(cowplot)

iris1 <- ggplot(iris, aes(x = Species, y = Sepal.Length)) +
  geom_boxplot() + theme_bw()

iris2 <- ggplot(iris, aes(x = Sepal.Length, fill = Species)) +
  geom_density(alpha = 0.7) + theme_bw() +
  theme(legend.position = c(0.8, 0.8))

plot_grid(iris1, iris2, labels = "AUTO")

passiflora · Answer 2 · 2018-11-12T07:46:27.047

3

As ggplot2 is based on grid graphics system instead of base plot, par does not effective in adjusting ggplot2 plots, and the latest version of ggplot2 has already supported the arrangement of different plots, and you can set tags for each of them:

iris=datasets::iris
ggplot(iris, aes(x=Sepal.Length,y=Sepal.Width,color=Species))+ geom_point(size=3) + labs(tag = "A") -> p1
ggplot(iris, aes(x=Petal.Length,y=Petal.Width,color=Species))+ geom_point(size=3) + labs(tag = "B") -> p2
p1 + p2

For more sophisticated arrangement, you can use patchwork package to arrange them

edited Nov 12 '18 at 07:46

answered Nov 12 '18 at 04:02

passiflora

332
1
9

I try your code but I received the following error: Error: Don't know how to add p2 to a plot – xcesco Nov 12 '18 at 07:42
Please update ggplot2 to the latest version (>3.0.0), and install `patchwork` package – passiflora Nov 12 '18 at 07:46
I did not find 'patchwork' from package repository (CRAN). – xcesco Nov 12 '18 at 07:56
`devtools::install_github("thomasp85/patchwork")` it's in Github, not CRAN – passiflora Nov 12 '18 at 09:27

Draw two plots in R with ggplot and par

2 Answers2