show multiple plots from ggplot on one page in r

Question

I want to make multiple ggplot in a loop and show them on one plot.

for ( i in 1:8) {
    g <- ggplot(data=mtcars, aes(x=hp, y=wt))+
        geom_point()
    print(g)
}

I want to arrange the plots above on one page, 4 rows and 2 columns. Does anyone know how to do that? Thanks.

Answer 1

You can save all the plot in a list then use either cowplot::plot_grid() or gridExtra::marrangeGrob() to put them in one or more pages

See also:

• Creating arbitrary panes in ggplot2 (patchwork, multipanelfigure & egg packages)

• Multiple plots in for loop

library(tidyverse)

# create a list with a specific length 
plot_lst <- vector("list", length = 8)

for (i in 1:8) {
  g <- ggplot(data = mtcars, aes(x = hp, y = wt)) +
    geom_point()
  plot_lst[[i]] <- g
}

# Combine all plots
cowplot::plot_grid(plotlist = plot_lst, nrow = 4)

library(gridExtra)
ml1 <- marrangeGrob(plot_lst, nrow = 2, ncol = 2)
ml1

^{Created on 2018-09-20 by the reprex package (v0.2.1.9000)}