CODEWITHSUNDEEP
rggplot2grob
user31888
user31888

Reputation: 421

Multiple R ggplots on same pdf page

I have an input data frame with 4 columns.

test <- head(mtcars[,c(1,2,8,9)])
test
                   mpg cyl vs am
Mazda RX4         21.0   6  0  1
Mazda RX4 Wag     21.0   6  0  1
Datsun 710        22.8   4  1  1
Hornet 4 Drive    21.4   6  1  0
Hornet Sportabout 18.7   8  0  0
Valiant           18.1   6  1  0

With a for loop, I would like to plot mpg vs cyl, then mpg vs vs, then mpg vs am, producing 3 distincts plots on the same page.

my code (inspired from Multiple ggplots on one page using a for loop and grid.arrange and ggplot2 : printing multiple plots in one page with a loop):

library(ggplot2)
library(gridExtras)

plot_list <- list()
for(i in 2:ncol(test)){
   plot_list[[i]] <- ggplot(test, aes(x=test[,i], y=mpg, fill=test[,i])) + 
   geom_point()
}
grid.arrange(grobs=plot_list)

Output:

Error in gList(list(wrapvp = list(x = 0.5, y = 0.5, width = 1, height = 1,  :
  only 'grobs' allowed in "gList"

Upvotes: 4

Views: 663

Answers (1)

Roland
Roland

Reputation: 132706

The canonical way is faceting:

test <- head(mtcars[,c(1,2,8,9)])
library(reshape2)
test <- melt(test, id.vars = "mpg")
library(ggplot2)
ggplot(test, aes(x = value, y = mpg, fill = value)) +
  geom_point() +
  facet_wrap(~ variable, ncol = 1)

If you are set on your way:

library(gridExtra)
plot_list <- list()
test <- head(mtcars[,c(1,2,8,9)])
for(i in 2:ncol(test)){
    plot_list[[i-1]] <- ggplotGrob(ggplot(test, aes(x=test[,i], y=mpg, fill=test[,i])) + 
    geom_point())
}
do.call(grid.arrange, plot_list)

Upvotes: 4

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