将数学符号和下标与常规字母混合 [英] Putting mathematical symbols and subscripts mixed with regular letters
问题描述
我想在 ggplot2
中绘制一个看起来像这样的标签:
I want to plot a label that looks like this in ggplot2
:
Value is $sigma$, R^{2} = 0.6
其中Value is
是普通字体,$sigma$
是希腊小写西格玛字母和 R^{2} = 0.6
显示为带有上标 2
的 R
后跟等号 (=
) 后跟 0.6
.如何在 ggplot factor
s 和 R 的 xlab,ylab
之类的参数中使用它?
Value is $sigma$, R^{2} = 0.6
where Value is
is ordinary font, $sigma$
is a Greek lowercase sigma letter and R^{2} = 0.6
appears as an R
with a superscript 2
followed by equal sign (=
) followed by 0.6
. How can this be used in ggplot factor
s and in arguments to things like xlab,ylab
of R?
推荐答案
类似这样的:
g <- ggplot(data=data.frame(x=0,y=0))+geom_point(aes(x=x,y=y))
g+ xlab( expression(paste("Value is ", sigma,",", R^{2},'=0.6')))
编辑
另一种选择是将 annotate
与 parse=T
一起使用:
Another option is to use annotate
with parse=T
:
g+ annotate('text', x = 0, y = 0,
label = "Value~is~sigma~R^{2}==0.6 ",parse = TRUE,size=20)
编辑
如果在绘图期间计算常数 0.6,paste
解决方案可能很有用.
The paste
solution may be useful if the constant 0.6 is computed during plotting.
r2.value <- 0.90
g+ xlab( expression(paste("Value is ", sigma,",", R^{2},'=',r2.value)))
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