I want to plot a label that looks like this in ggplot2
:
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?
Something like this :
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')))
EDIT
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)
EDIT
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)))