如何在ggplot中的geom_text标签中键入下标
如何在ggplot中的geom_text标签中键入下标
提问于 2019-03-20 22:41:34
我已经绘制了时间序列数据，并按我想要用下标标记的时间点进行分隔。下面是我用来生成图形和时间点标签的代码。我希望-1、3和6作为下标。提前感谢！
timepoints=data.frame(date=as_datetime(c("2016-08-15" ,"2016-11-22",
"2017-02-25")), timepoint=c("T-1", "T3", "T6"))
TimeseriespH = ggplot(FinalSeaphox, aes(x=DTTM)) +
geom_line(aes(y=MpH, color = "Outer Bay", group = grp), size = 0.5) +
geom_line(aes(y=CpH, color = "Inner Bay", group = grp), size = 0.5) +
scale_x_datetime(labels = date_format("%b '%y"), date_breaks = "1
month", limits = as_datetime(c("2016-07-01","2017-04-19"))) +
labs(x = "", y = "pH") +
scale_y_continuous(limits = c(7.4,8.2)) +
geom_vline(xintercept = as_datetime("2016-12-01"), linetype = 2, color
= "black") +
geom_vline(xintercept = as_datetime("2016-08-26"), linetype = 2, color
= "black") +
geom_vline(xintercept = as_datetime("2017-03-06"), linetype = 2, color
= "black") +
geom_text(data=timepoints, mapping=aes(x=date, y=c(8.18, 8.18, 8.18),
label=timepoint), size=5, vjust=-0.4, hjust=0, inherit.aes = FALSE,
color = "black") 回答 1
Stack Overflow用户
回答已采纳
发布于 2019-03-20 23:14:37
对于下标，需要用括号括起来：
timepoint = c("T[-1]", "T[3]", "T[6]")然后在geom_text中使用parse = TRUE：
library(ggplot2)
library(lubridate)
timepoints=data.frame(
date = as_datetime(c("2016-08-15" ,"2016-11-22", "2017-02-25")),
Y = c(8, 8.1, 8)
timepoint = c("T[-1]", "T[3]", "T[6]")
)
ggplot(timepoints) +
geom_point(aes(x = date, y=Y), size = 3) +
geom_text(data=timepoints,
mapping=aes(x=date, y=c(8.18, 8.18, 8.18),
label = timepoint),
size=5, vjust=0.4, hjust=0, inherit.aes = FALSE,
color = "black", parse = TRUE)
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原文链接：
https://stackoverflow.com/questions/55263468
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