[R] How to join two plotmath type expressions

[S Ellison]

>  > label <- 'Temperature'
>  > unit <- expression(paste(degree,'C'))
> 
> how can I join them together for use in mtext (or 
> equivalent)? The following is conceptually what I want to do, 

This seems to work:

plot(1:10, type='n')

label <- 'Temperature'
unit <- bquote(degree*C)
text(5,5,substitute(l~u, list(l=label, u=unit)))
 
S Ellison

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