[R] Subscript and superscript on one symbol; plotmath.

[Duncan Murdoch]

On 09/12/2020 3:06 a.m., Rolf Turner wrote:
> 
> I would like to produce, as graphical annotation, the Greek letter sigma
> with a superscript of 2 and a subcript of 11.  (I.e. the top left hand
> entry of a covariance matrix.)
> 
> I've tried:
> 
> plot(1:10,main=expression({sigma^2}[11]))
> 
> (and variants).  This "sort of" works but there is an undesirable
> gap between the sigma and the subscript 11. (IOW the subscript is to
> the right of the superscript, whereas ideally the first "1" in "11"
> should be vertically below the superscript.

When I run

  plot(1:10,main=expression(sigma[11]^2))

I think I get what you want.

Duncan Murdoch

> 
> I've also tried (hammer and hope!):
> 
> plot(1:10,main=expression(sigma*atop(scriptstyle(2),scriptstyle(11))))
> 
> and again this "sort of" works but places the putative superscript a
> bit too high and the putative subscript a bit too low.
> 
> Is there any way to achieve, with plotmath, an effect like unto that
> produced by the LaTeX expression $\sigma^2_{11}$?  Or should I just
> give up and go to the pub? :-)
> 
> cheers,
> 
> Rolf Turner
> 
> P.S.  I've explicitly CC-ed Paul Murrell, who is obviously the go-to
> guy on such matters, in case he does not regularly monitor this list.
> 
> R. T.
>