[R] Specifying Greek Character in Lattice Plot Label

[David Winsemius]

On Oct 21, 2011, at 11:27 AM, Rich Shepard wrote:

>  For an axis label I want to include the Greek letter mu within the  
> string.
> I've not found the proper way of including that expression within the
> string.
>
>  What I want is "Conductivity (uS/cm)" with the 'u' replaced by mu.  
> When I
> try "Conductivity (" expression(paste(mu)) "S/cm)" I get an error.  
> If I
> don't separate Conductivity and S/cm with parentheses the string
> 'expression(paste(mu))' displays in the lable.

try:

  plot(1,1, xlab=expression(Conductivity~"("*mu*S/cm*")") )

Parens are the only characters that need to be quoted and you do need  
to use proper plotmath connectors,  "~" and "*" depending on whether  
you ant a space to appear or not. I don't hink you can join character  
values and expression values in the manner that you offer but I admit  
I never tried it, so I don't know for sure. Generally "language" and  
"expression" objects have their own special set of functions and syntax.

>
>  What am I doing incorrectly?
>
> Rich
>
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David Winsemius, MD
West Hartford, CT