r - 如何使用 R 中的 grid.arrange 在并排排列的地块周围绘制框/边框

Question

我使用 ggplot 创建了两个图，如下所示：

library(ggplot2)
library(gridExtra)
g1 <- ggplot(iris, aes(Sepal.Width, Sepal.Length)) + geom_point()
g2 <- ggplot(iris, aes(Petal.Width, Petal.Length)) + geom_point()
grid.arrange(g1, g2, ncol=2)

我想在 grid.arrange 生成的两个并排图周围绘制一个边框/框...我认为这与使用 grid.border 有关，但我不确定该怎么做。会感谢任何帮助吗？

Answer 1

Using an example from the ggplot help page:

 gg <- df <- data.frame(gp = factor(rep(letters[1:3], each = 10)),
                  y = rnorm(30))

 library(plyr)
 ds <- ddply(df, .(gp), summarise, mean = mean(y), sd = sd(y))
 gg2 <-ggplot(df, aes(x = gp, y = y)) +
    geom_point() +
    geom_point(data = ds, aes(y = mean),
               colour = 'red', size = 3)+theme(panel.border=element_rect(fill=NA) )
 grid.arrange(gg2,gg2, ncol=2)

Or perhaps this depending on your meeaning:

 gg2 <-ggplot(df, aes(x = gp, y = y)) +
    geom_point() +
    geom_point(data = ds, aes(y = mean),
               colour = 'red', size = 3)+theme(plot.background = element_rect(size=3,linetype="solid",color="black"))
 grid.arrange(gg2,gg2, ncol=2)

If you just want a bordering rectangle:

grid.rect(.5,.5,width=unit(.99,"npc"), height=unit(0.99,"npc"), 
          gp=gpar(lwd=3, fill=NA, col="blue"))