[R] plotmath: unexpected SPECIAL

[Bryan Hanson]

Thanks to both David and Sarah.  I'm glad I asked, as I had tried some  
of the combos Sarah suggested and observed the same behavior, which  
puzzled me.  David, thanks for reminding me about ~ as that is a  
different way to get a space into the string.  I just don't use  
plotmath often enough to become decent at it.  Thanks again.  Bryan

On Jun 22, 2011, at 8:49 PM, David Winsemius wrote:

>
> On Jun 22, 2011, at 8:10 PM, Bryan Hanson wrote:
>
>> Hello R Masters and the Rest of Us:
>>
>> The first of these works fine, the 2nd is accepted but too literal  
>> (the "%->%" is shown in the plot label and in the wrong position).   
>> The 3rd throws and error due to "unexpected SPECIAL".  Would  
>> someone recommend a way to format this?  I want the two phrases  
>> connected by a right arrow.
>>
>> TIA, these things always elude me.  Bryan
>> ***********
>> Bryan Hanson
>> Professor of Chemistry & Biochemistry
>> DePauw University
>>
>> xlab1 <-expression(paste("Phase Angle ", phi, " Neat-O"))
>> xlab2 <- expression(paste("treatment: low stress", "high stress",  
>> sep = "%->%"))
>> xlab3 <- expression(paste("treatment: low stress", %->%, "high  
>> stress"))
>>
>> plot(1:10, main = xlab1)
>> plot(1:10, main = xlab2)
>
> Doesn't seem that %->% "works" without flanking terms
>
> xlab3 <- expression(treatment*":"~low~stress %->% high~stress)
> plot(1, main=xlab3)
>
> Or:
>
> xlab3 <- expression("treatment: low stress" %->% high~stress)
> plot(1, main=xlab3)
>
> -- 
> David Winsemius, MD
> West Hartford, CT
>