[R] square brackets in expression in plots

[David Winsemius]

On Jul 20, 2010, at 12:42 PM, Jannis wrote:

> Dears,
>
>
> do you know whether it is possible to include any square parantheses  
> (brackets) in an expression to use it as an axis label?
>
> e.g. I would like to have a label like (with the sub and  
> superscripts correct):
>
> "speed [m s^-1]"

Not exactly clear what you mean by "correct".
>
> I know how to combine an expression with text via paste, but as I  
> run soimething like:
>
> a='m*s^{-1}'
> plot(1:10,main=parse(text=a))

?plotmath

This seemed to work fine with main, sub and xlab:

a='speed [m*s^-1]'
  plot(1:10,main=parse(text=a))

But maybe you wanted the square-brackets?

a='speed~bgroup("[", m*s^-1, "]")'
plot(1:10,main=parse(text=a))

>
> I found now way of doing this. I use the parse thing as I have all  
> these units stored as strings that represent expressions.
>
>
> Cheers for any help!
>
> Jannis
>
>
>
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David Winsemius, MD
West Hartford, CT