使用选定因子水平的值将水平线添加到ggplot-barchart [英] Adding horizontal lines to a ggplot-barchart with the value of selected factor-levels

问题描述

在这个情节中

df <- data.frame(factor = as.factor(c(rep("A",3), rep("B",3))), Treatment = c(rep(c("A","B","C"),2)), values=runif(6,0,1))

ggplot(df, aes(Treatment, values))+
  geom_bar(stat="identity", position="dodge") +
  facet_wrap(~factor)

我如何在给定治疗级别(例如"A")的 yintercept 的每个方面添加 geom_hline

how can i add a geom_hline to each facet with the yintercept of a given Treatment-level (e.g. "A")

+geom_hline(data=df, aes(yintercept= df[df$Treatment=="A",]))

不起作用:

错误:美学的长度必须为1或与数据(6)相同:yintercept

Error: Aesthetics must be either length 1 or the same as the data (6): yintercept

推荐答案

library(tidyverse)

df <- data.frame(factor = as.factor(c(rep("A",3), rep("B",3))), Treatment = c(rep(c("A","B","C"),2)), values=runif(6,0,1))

ggplot(df, aes(Treatment, values))+
  geom_bar(stat="identity", position="dodge") +
  facet_wrap(~factor) +
  geom_hline(data = df %>% filter(Treatment == "A"), aes(yintercept = values))

由 reprex软件包(v0.2.0)创建于2018-03-23.

Created on 2018-03-23 by the reprex package (v0.2.0).

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