[R] Help using expression

[Anders Nielsen]

Dear R users

I am doing a series of plots and I want the titles to be
expressions controlled by a loop. I believe the problem
can be isolated to:

The plot I want can be produced with:

plot(5, main=expression(alpha[1992]))

But why can't I do something this?

i<-1992
plot(5, main=expression(paste("alpha[",i,"]",sep="")))

I have tried other wrong combinations of paste
and expression. What is the right one?


Any help will be greatly appreciated


Anders

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