mtext() in R plot

Question

I was wondering what's wrong with mtext() that I can't get the number G correctly show above my plot?

Here is my R code:

G <- .3333 ## but G can be anything as it comes from a function

curve(dnorm(x),-3,3)
mtext(expression(paste("Medium: ",bold('CT'[12])," = ", round(G,2))),line=3)

Answer 1

You can use bquote and .() (this is used to include variables in an expression) for this:

G <- 0.3333
curve(dnorm(x),-3,3)
mtext(bquote(paste("Medium: ",bold('CT'[12])," = ", .(round(G,3)))),line=3)

This gives: