r - grid.arrange 图上的奇怪空间

Question

我正在尝试将脚注添加到 grid.arrange 图。我在这个可重复的例子中提出了我的想法:
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library(ggplot2)
library(gridExtra)
library(grid)
library(gtable)

summary(anscombe)

p1 <- ggplot(anscombe) + geom_point(aes(x1, y1), color = "darkorange", size = 3) + theme_bw() 

p2 <- ggplot(anscombe) + geom_point(aes(x2, y2), color = "darkorange", size = 3) + theme_bw()

p3 <- ggplot(anscombe) + geom_point(aes(x3, y3), color = "darkorange", size = 3) + theme_bw()

p4 <- ggplot(anscombe) + geom_point(aes(x4, y4), color = "darkorange", size = 3) + theme_bw() 

title <- textGrob("Some title",
              gp=gpar(fontsize=20,fontface=2))

source1<- textGrob("Source: https://rpubs.com/neilfws/91339",
              hjust=0,x=0,y=1,
              gp=gpar(fontsize=10,fontface=3))

grid.arrange(arrangeGrob(p1,p2,p3,p4, ncol=2, sub = source1), top = title)

此代码生成该图片:



在图表下方有巨大的空间。如何摆脱它？它为什么被创建？

Answer 1

尝试使用 bottom而不是 sub :

grid.arrange(arrangeGrob(p1,p2,p3,p4, ncol=2, bottom = source1), top = title)