如何在ggplot中编写化学式 [英] How to write chemical formulas in ggplot

问题描述

我需要绘制一些数据，并且其中之一必须在标签中包含硫酸盐分子式(SO42-).

I need to plot some data and one of the plot has to have the sulphate formula (SO42-) in the labels.

我正在使用此代码

a=c(1,2,3,4,5)
b=c(1,2,3,4,5)
dd=data.frame(a,b)

G<-ggplot(dd)+
geom_line(x=a, y=b, color="blue")+
labs(x="Depth (m)", y=expression("nss SO"[4]^{2-}"(ppb)"))
G

当然，这是行不通的:--写为2和ppb之间的破折号，或者在给了我一堆文字之后它什么也没做.我想念什么吗?

And, of course, it doesn't work: either the - is written as a dash between the 2 and the ppb or it simply does nothing after giving me a wall of text. Am I missing something?

推荐答案

首先，您缺少geom_line的aes()组件.对于表达式，您不太正确地使用语法.使用在此处中找到的信息，能够创建....

First, you're missing the aes() component of geom_line. For the expression, you're not quite hitting the syntax correctly. Using information found here, I was able to create....

library(ggplot2)
a=c(1,2,3,4,5)
b=c(1,2,3,4,5)
dd=data.frame(a,b)

G <-ggplot(dd)+
  geom_line(aes(x=a, y=b), color = 'blue') + # need to include aes() designation here
  labs(x="Depth (m)", y=expression("nss SO" ["4"] ^"2-"*" (ppb)"))
G

希望有效！

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