[R] Paste expression in graph title

[Paul Chatfield]

This was my initial attempt at creating a title on a graph of the R squared
value:

x<-rnorm(10)
y<-rnorm(10)
plot(x,y, main=paste(expression(R^2)," = ",round(summary(lm(y~
x))$r.squared, digits=3), sep=""))

I've read various other posts that say expression needs to be taken outside
the paste, but I can't seem to get it work as the following fails

plot(x,y, main=expression(paste("R^2"," = ",round(summary(lm(y~
x))$r.squared, digits=3), sep="")))

I tried it with title() and didn't get much further either.

Hmmm, any ideas what am I missing?

Thanks

Paul
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