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

[Duncan Murdoch]

On 09/12/2020 6:45 p.m., Rolf Turner wrote:
> 
> On Wed, 9 Dec 2020 06:18:10 -0500
> Duncan Murdoch <murdoch.duncan using gmail.com> wrote:
> 
>> 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.
> 
> <SNIP>
> 
> Dang!!! I was sure that that's one of the variants I'd tried!!!
> Duh.  This is indeed exactly what I want.  Thanks Duncan.

You probably did try it, but remember what Einstein is supposed to have 
said:

“Insanity is doing the same thing over and over and expecting different 
results.”

It just shows that it helps to be a little insane.

Duncan Murdoch