使用ggplot和gtable对齐多个绘图

Question

我已经用ggplot2创建了两个绘图，我想用gtable同时显示这两个绘图。我有两个问题。首先，我希望两个图的面板大小匹配。我已经使用gtable实现了这一点。第二个问题是，我希望第一个图的宽度是第二个图的三倍。在使用ggtable中的bind()函数匹配面板大小时，我似乎不知道如何做到这一点。

下面提供了可重现的代码。

library(ggplot2)
library(gtable)

set.seed(2345)

mean1 <- runif(8, 700, 1000)
low1 <- mean1 - 100
high1 <- mean1 + 100
names1 <- paste0("really long name", 1:length(mean1))
df1 <- data.frame(mean = mean1,
  low = low1,
  high = high1,
  names = names1)

mean2 <- runif(2, 700, 1000)
low2 <- mean2 - 100
high2 <- mean2 + 100
names2 <- paste0("name", 1:length(mean2))
df2 <- data.frame(mean = mean2,
  low = low2,
  high = high2,
  names = names2)

plot1 <- ggplot(df1, aes(x = names, y = mean)) + 
  geom_errorbar(aes(ymin = low, ymax = high), width = 0) +
  geom_point() +
  scale_y_continuous(limits = c(.95*min(df1$low), 1.05*max(df1$high))) +
  xlab("") + 
  theme(axis.text.x = element_text(angle = 45, hjust = 1))

plot2 <- ggplot(df2, aes(x = names, y = mean)) + 
  geom_errorbar(aes(ymin = low, ymax = high), width = 0) +
  geom_point() +
  scale_y_continuous(limits = c(.95*min(df1$low), 1.05*max(df1$high))) +
  xlab("") + 
  theme(axis.text.x = element_text(angle = 0, hjust = .5))

grob1 <- ggplotGrob(plot1) #Convert to gtable 
grob2 <- ggplotGrob(plot2) #Convert to gtable

grob <- cbind(grob1, grob2, size = "first") #Bind rt data

title <- textGrob("Title", gp = gpar(fontsize = 12)) #Add title
grob <- gtable_add_rows(
  grob, #gtable object
  heights = grobHeight(title) + padding, #height for new row
  pos = 0 #0 adds on top
)
grob <- gtable_add_grob(
  grob, #gtable object
  title, #grob to be added
  t = 1, l = 1, r = ncol(sG) #top, left, and right (18) extent of grob
)

grid.newpage()
grid.draw(grob)

​

​

如您所见，面板大小匹配，但图1(左)和图2(右)的宽度相同。我想合并这两个，这样图1的宽度是图2的三倍。我还想在这两个图的上面添加一个标题，我已经在提供的代码中这样做了。

Answer 1

使用egg package 和ggarrange函数，只需一行代码即可完成所有操作：

egg::ggarrange(plot1, plot2, ncol = 2, top = "foo", widths = c(3, 1))

​

​