Putting mathematical symbols and subscripts mixed with regular letters [duplicate]
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 … Read more