如何在绘图(ggplot2)的文本注释中放置 +/- 加减运算符? [英] How to place +/- plus minus operator in text annotation of plot (ggplot2)?

问题描述

我尝试了以下方法，但对我不起作用:

I have tried the following, but it doesn't work for me:

a <- ggplot()
a <- a + geom_point(aes(x=seq(0,1,0.1), y=seq(0,1,0.1)))
a <- a + annotate("text", x=0.5, y=0.3, label="myplot")
a <- a + annotate("text", x=0.5,y=0.2,label=expression(%+-%))

我还尝试了 How to annotate() ggplot with乳胶没有运气:

I have also tried the following as pointed out by How to annotate() ggplot with latex with no luck:

a <- a + annotate("text", x=0.5, y=0.1, label="%+-%", parse=TRUE)

这也不起作用:

a <- a + annotate("text", x=0.5, y=0.1, label="pm", parse=TRUE)

推荐答案

可以使用unicode表示(u00B1):

It is possible to use the unicode representation (u00B1):

a <- ggplot()
a <- a + geom_point(aes(x=seq(0,1,0.1), y=seq(0,1,0.1)))
a <- a + annotate("text", x=0.5, y=0.3, label="myplot")
a + annotate("text", x=0.5, y=0.2, label="u00B1")

或者您可以直接使用 ± 符号，方法是从某处复制和粘贴它.

Or you can use the ± symbol directly, by copying and pasting it from somewhere.

a + annotate("text", x=0.5, y=0.2, label="±")

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