[R] Plotmath issue superscript "-"

[P Ehlers]

If you need a subscript as well, I like

  plot(0, main=quote({NO^'\x96'}[3]))

Peter Ehlers

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:
>>
>>   
>>> expression(NO^{-}[3])
>>>     
>> Error: syntax error, unexpected '}' in "expression(NO^{-}"
>>   
>>> expression(NO^-[3])
>>>     
>> Error: syntax error, unexpected '[' in "expression(NO^-["
>>   
>>> expression(NO^-)
>>>     
>> Error: syntax error, unexpected ')' in "expression(NO^-)"
>>   
>>> expression(NO^{-})
>>>     
>> Error: syntax error, unexpected '}' in "expression(NO^{-}"
>>
>> This is with R 2.5.1 (exact version info below).
>>
>> I suspect this is something to do with my use of the "-", which has some
>> special meaning.
>>
>> Is there a way to achieve a superscript "-" (or similar looking
>> character) using the plotmath routines in R?
>>
>>   
> It's an operator, it needs something to operate on.
> 
> Try
> 
>  plot(0,main=quote(NO^-{}))
> 
> 
> 
>> Thanks in advance,
>>
>> G
>>
>>   
>>> version
>>>     
>>                _                                          
>> platform       i686-pc-linux-gnu                          
>> arch           i686                                       
>> os             linux-gnu                                  
>> system         i686, linux-gnu                            
>> status         Patched                                    
>> major          2                                          
>> minor          5.1                                        
>> year           2007                                       
>> month          07                                         
>> day            05                                         
>> svn rev        42131                                      
>> language       R                                          
>> version.string R version 2.5.1 Patched (2007-07-05 r42131)
>>
>>   
> 
>