[R] expressions and paste

Roger D. Peng rpeng at jhsph.edu
Thu Nov 11 18:58:26 CET 2004

Can you be a bit more specific?  Exactly what kind of symbol are you 
trying to put in the title?


Emily Baldock wrote:
> I have written a function to plot data which will be used for various different chemistries.
> A simplified version is:
> plot_data <- function(risk,levels,chem,sd2,measure){
>   plot(risk, levels,main=paste ("per", sd2, measure, "\n in usual", chem))
> }
> The problem is with the title.
> This works fine if the variable "chem" is just text, but if it is an expression then obviously it won't work.
> I have experimented with various things and I am at a complete loss for how to insert an expression into the middle of 
> a title.
> If the expression was going in directly I would use main=expression(paste("text ", expression, " text")) but again this 
> doesn't work.
> Can anyone help?
> thanks
> Emily.
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Roger D. Peng

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