指定 ggplot2 面板宽度 [英] Specifying ggplot2 panel width

问题描述

我在同一页面上有两个 ggplots，我希望它们的面板宽度相同.

I have two ggplots on the same page, and I'd like their panels to be the same width.

一些示例数据:

dfr1 <- data.frame(
  time = 1:10,
  value = runif(10)  
)

dfr2 <- data.frame(
  time = 1:10,
  value = runif(10, 1000, 1001)  
)

一个图在另一个下面:

p1 <- ggplot(dfr1, aes(time, value)) + geom_line()
p2 <- ggplot(dfr2, aes(time, value)) + geom_line()

grid.newpage()
pushViewport(viewport(layout = grid.layout(2, 1)))   
print(p1, vp = viewport(layout.pos.row = 1, layout.pos.col = 1))         
print(p2, vp = viewport(layout.pos.row = 2, layout.pos.col = 1))

如何指定每个图中的面板宽度和位置，以使它们对齐?

How do I specify the panel widths and positions in each plot, in order to make them line up?

(我不想将绘图与分面结合起来；这在我的实际示例中不合适.)

(I don't want to combine the plots with faceting; it isn't appropriate in my real-world example.)

推荐答案

原解决方案:

 #   install.packages("ggExtra", repos="http://R-Forge.R-project.org")
 #   library(ggExtra)
 #   align.plots(p1, p2)

编辑 (22/03/13):

Edit (22/03/13):

由于ggExtra已经不存在了(并且ggplot2的很多内部结构都发生了变化)，最好使用gtable包提供的合并函数(rbind，cbind)，

Since ggExtra doesn't exist anymore (and many internals of ggplot2 have changed), it's better to use the merging functions (rbind, cbind) provided by the gtable package,

gl = lapply(list(p1,p2), ggplotGrob)     
library(gtable)
g = do.call(rbind, c(gl, size="first"))
g$widths = do.call(unit.pmax, lapply(gl, "[[", "widths"))

grid.newpage()
grid.draw(g)    

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