[R] Help with plotmath

[Petr Pikal]

Hi

On 10 Jun 2004 at 12:28, Steve Roberts wrote:

> There must be a simple answer. I want to plot an expression, 
> where the expression is held in a string variable. The "obvious"
> solution along the lines of
> 
> ex<-"x^2"
> plot( c(0,1), c(0,1), main=as.expression(ex) )

Plotmath example led me to

ex<-expression(x^2)
plot( c(0,1), c(0,1), main=(ex) )

hope it is what you want.

Cheers
Petr


> 
> gives me the a title x^2 - ie doesn't treat it like an expression. I
> suspect I don't understand expressions properly. For the real problem
> I do need to have my expression string in a variable as it is
> data-dependent. 
> 
> Can someone tell me the magic words?
> 
> Steve
>   Dr Steve Roberts 
>   steve.roberts at man.ac.uk
> 
> Senior Lecturer in Medical Statistics,
> CMMCH NHS Trust and University of Manchester Biostatistics Group, 0161
> 275 5192 / 0161 276 5785
> 
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Petr Pikal
petr.pikal at precheza.cz