在带有Cowplot的ggplot-grid构建中添加x和y laxis标签 [英] Adding x and y laxis label to ggplot-grid build with cowplot

问题描述

我用Cowplot制作了一个网格:

 库(ggplot2)图书馆(cowplot)ggg1<-ggplot(mtcars，aes(mpg，vs))+ geom_point()+主题(axis.title.x = element_blank()，axis.title.y = element_blank())ggg2<-ggplot(mtcars，aes(mpg，vs))+ geom_point()+主题(axis.title.x = element_blank()，axis.title.y = element_blank())ggg3<-ggplot(mtcars，aes(mpg，vs))+ geom_point()+主题(axis.title.x = element_blank()，axis.title.y = element_blank())plot_grid(plot_grid(ggg1，ggg2，labels = c("，")，ncol = 1)，ggg3，labels = c("，")，ncol = 2) 

产生图片

(当然，这只是一个最小的工作示例).

现在，我想有一个标题为"mpg"的xaxis和一个标题为"vs"的yaxis-每个居中位置都像这样:

如何使用ggplot做到这一点.我没有尝试使用 add_sub 或 draw_label 或

I produced a grid with cowplot:

library(ggplot2)
library(cowplot)

ggg1 <- ggplot(mtcars, aes(mpg,vs)) + geom_point() +
  theme(axis.title.x=element_blank(),
        axis.title.y=element_blank())
ggg2 <- ggplot(mtcars, aes(mpg,vs)) + geom_point() +
  theme(axis.title.x=element_blank(),
        axis.title.y=element_blank())
ggg3 <- ggplot(mtcars, aes(mpg,vs)) + geom_point() +
  theme(axis.title.x=element_blank(),
        axis.title.y=element_blank())
plot_grid(plot_grid(ggg1, ggg2, labels=c("", ""), ncol = 1), ggg3, labels=c("", ""), ncol = 2)

resulting in the image

(of course this is just a minimal working example).

Now I would like to have a xaxis with the title "mpg" and a yaxis with the title "vs" - each centered like so:

How can I do this with ggplot. Nothing I tried with add_sub or draw_label or How do I customize the margin and label settings with plot_grid? worked. The answer to ggplot: how to add common x and y labels to a grid of plots does not use cowplot. Can I do this with cowplot?

Important: I want to be able to set the size of the font of the labels.

解决方案

This seems to work...

plot_grid(plot_grid(ggg1, ggg2, labels=c("", ""), ncol = 1), 
          ggg3, 
          labels=c("", ""), 
          ncol =2,  
          scale=0.9) + #perhaps reduce this for a bit more space
draw_label("xlab", x=0.5, y=  0, vjust=-0.5, angle= 0) +
draw_label("ylab", x=  0, y=0.5, vjust= 1.5, angle=90)

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