[R] Math expressions in pie chart labels?

[Gabor Grothendieck]

On 5/3/06, Uwe Ligges <ligges at statistik.uni-dortmund.de> wrote:
> Johannes Graumann wrote:
>
> > On Tuesday 02 May 2006 23:33, Uwe Ligges wrote:
> >
> >>Then please read ?plotmath and use it:
> >>
> >>labels = expression("" >= 0.66, "" == 0.33, "" <= -0.33, "" <= -0.66)
> >
> >
> > Error in lab != "" : comparison is not allowed for expressions
> > In addition: Warning message:
> > is.na() applied to non-(list or vector) in: is.na(lab <- labels[i])
> >
> > I don't seem to be the only one having problems with this ;0)
>
>
> Then please tell us the details, I just tried successfully:
>
> plot(1:10, xaxt="n")
> axis(1, at = c(1,3,5,7), labels =
>      expression("" >= 0.66, "" == 0.33, "" <= -0.33, "" <= -0.66))
>

I think the discussion applies to pie:

> pie(c(1,3,5,7), labels =
+      expression("" >= 0.66, "" == 0.33, "" <= -0.33, "" <= -0.66))
Error in lab != "" : comparison is not allowed for expressions
In addition: Warning message:
is.na() applied to non-(list or vector) in: is.na(lab <- labels[i])