[R] subscript with comma

[suse]

David Winsemius wrote
> 
> The insight that  
> allowed me to get a significantly higher frequency of success was   
> realizing that the correct separators between separate expressions  
> were "*" and "~" rather than <space> or <comma>. Inside an expression  
> a comma will signal a new expression element. A space without a  
> plotmath operator intervening just throws an error
> 

Thanks, this helps.
I guess my problem was that I thought that the problem with the comma
occurred because of the [] around. I didn't think that comma itself was the
problem.

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