[R] superscript characters in title with '+'

[Gavin Simpson]

On Fri, 2010-10-22 at 15:39 +0200, Claudia Beleites wrote:
> On 10/22/2010 03:15 PM, DrCJones wrote:
<snip />
> 
> Being a chemist, it seemed natural to me to put the i after the concentration 
> brackets into a subscript - though you didn't say you want that.
> 
> A more "correct" expression would be:
> 
> group ("[", Ca^'2+', "]") [i]~onsets

You don't need to quote the 2+, but if you don't quote it you have to
give R's parser something to work with on the RHS of "+". phantom() is
useful in such cases:

plot(1:10, ylab = expression(group("[", Ca^{2+phantom()}, "]")[i]~onsets))

for example, produces similar output to your version. My preference is
to use fewer strings in these expressions, but then again my version
involves more typing. You pays your money... as they say.

G

> where you can easier see that the "[" and "]" are special left and right 
> delimiters. Note that the only term that needs to be "hidden" as character is 
> the charge, as R doesn't know this way of writing ion charges and supposes + to 
> be an infix operator.
> 
> 
> Cheers,
> 
> Claudia

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