R help - Oct 2011 - Specifying Greek Character in Lattice Plot Label

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.

   What am I doing incorrectly?

Rich

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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