[R] Plotmath issue superscript "-"

[Gavin Simpson]

On Thu, 2007-09-20 at 18:19 +0200, Peter Dalgaard wrote:
> Gavin Simpson wrote:
> > Dear List,
> >
> > I'm trying to typeset some chemical ions in axis labels. These have both
> > super and subscript components, and for some, I need a superscript "-".
> > In LaTeX I might use $NO_3^-$ to do the typesetting, but I'm having a
> > problem getting the correct invocation for expression:
<snip />
> >   
> It's an operator, it needs something to operate on.
> 
> Try
> 
>  plot(0,main=quote(NO^-{}))
> 

Thanks, Peter, for this solution, and also to Peter Ehlers and
ScionForbai for theirs.

All the best,

G
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