ggplot：如何更改构面标签？ [英] ggplot: How to change facet labels?

问题描述

我使用了下面的ggplot命令：

I have used the following ggplot command:

ggplot(survey,aes(x=age))+stat_bin(aes(n=nrow(h3),y=..count../n), binwidth=10)
  +scale_y_continuous(formatter = "percent", breaks=c(0, 0.1, 0.2)) 
  + facet_grid(hospital ~ .) 
  + opts(panel.background = theme_blank()) 

<生产

to produce

然而，我想将 facet 标签更改为更短的标签（如Hosp 1，Hosp 2 ...），因为它们现在太长而且看起来拥挤（增加图形的高度不是一个选项，它会占用太多的文档空间）。我查看了 facet_grid 帮助页面，但无法弄清楚。

I'd like to change the facet labels, however, to something shorter (like Hosp 1, Hosp 2...) because they are too long now and look cramped (increasing the height of the graph is not an option, it would take too much space in the document). I looked at the facet_grid help page but cannot figure out how.

推荐答案

使用类似于以下的方式更改基础级别名称：

Change the underlying factor level names with something like:

# Using the Iris data
> i <- iris
> levels(i$Species)
[1] "setosa"     "versicolor" "virginica" 
> levels(i$Species) <- c("S", "Ve", "Vi")
> ggplot(i, aes(Petal.Length)) + stat_bin() + facet_grid(Species ~ .)

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