在ggplot2 facet标签中表达 [英] Expression in ggplot2 facet labels
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问题描述
我希望在 ggplot2
facet标签中包含R 表达式
。
假设我正在绘制提示
data.frame
:
library(reshape2)
>头(提示)
total_bill提示性吸烟者日时间大小
1 16.99 1.01女性无阳光晚餐2
2 10.34 1.66男性无阳光晚餐3
3 21.01 3.50男性无阳光晚餐3
4 23.68 3.31男性无太阳晚餐2
5 24.59 3.61女性无太阳晚餐4
6 25.29 4.71男性无太阳晚餐4
如下:
library(ggplot2)$ b $ (形状= 1)+
facet_wrap(〜sex,ncol = 1)b $ sp $ ggplot(tips,aes(x = total_bill,y = tip / total_bill))+
我不希望将女性和男性作为小平面标签,而是希望拥有:
女性科目和男性科目,分别。据我所知,R中的标签是通过表达式
函数实现的,但我不知道如何将它与facet_wrap
。
解决方案看起来过于复杂,但有效。您必须使用
facet_grid
。make_label< - 函数(值){
x< - as.character(值)
bquote(斜体(。(x))〜科目)
}
plot_labeller< - 函数(变量,值){
do.call(表达式,lapply(levels(value),make_label))
}
ggplot(tips,aes(x = total_bill ,y = tip / total_bill))+
geom_point(shape = 1)+
facet_grid(。〜sex,labeller = plot_labeller)
I would like to have an R
expression
in aggplot2
facet label.Let's say I'm plotting the
tips
data.frame
:library(reshape2) > head(tips) total_bill tip sex smoker day time size 1 16.99 1.01 Female No Sun Dinner 2 2 10.34 1.66 Male No Sun Dinner 3 3 21.01 3.50 Male No Sun Dinner 3 4 23.68 3.31 Male No Sun Dinner 2 5 24.59 3.61 Female No Sun Dinner 4 6 25.29 4.71 Male No Sun Dinner 4
as follows:
library(ggplot2) sp <- ggplot(tips, aes(x=total_bill, y=tip/total_bill)) + geom_point(shape=1) + facet_wrap(~sex, ncol = 1)
Instead of having "Female" and "Male" as facet labels I would like to have: "Female subjects" and "Male subjects", respectively. As far as I know italicizing a label in R is achieved through the
expression
function, but I don't know how to combine that withfacet_wrap
.解决方案Looks overly complicated, but works. You'll have to use
facet_grid
though.make_label <- function(value) { x <- as.character(value) bquote(italic(.(x))~subjects) } plot_labeller <- function(variable, value) { do.call(expression, lapply(levels(value), make_label)) } ggplot(tips, aes(x=total_bill, y=tip/total_bill)) + geom_point(shape=1) + facet_grid(.~sex, labeller = plot_labeller)
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