R devel - Sep 2010 - scalable < > delimiters in plotmath

Dear list,

I read in ?plotmath that I can use bgroup to draw scalable delimiters
such as [ ] and ( ). The same technique fails with < > however, and I
cannot find a workaround,

grid.text(expression(bgroup("<",atop(x,y),">")))

Error in bgroup("<", atop(x, y), ">") : invalid group
delimiter

Regards,

baptiste

sessionInfo()
R version 2.11.1 (2010-05-31)
x86_64-apple-darwin9.8.0

locale:
[1] en_GB.UTF-8/en_GB.UTF-8/C/C/en_GB.UTF-8/en_GB.UTF-8

attached base packages:
[1] grid      stats     graphics  grDevices utils     datasets
methods   base

other attached packages:
[1] TeachingDemos_2.7

loaded via a namespace (and not attached):
[1] tools_2.11.1

What do people use to show angle brackets < > in R graphics? Have I
missed something obvious?

Thanks,

baptiste

On 9 September 2010 17:57, baptiste auguie
<baptiste.auguie at googlemail.com> wrote:
> Dear list,
>
> I read in ?plotmath that I can use bgroup to draw scalable delimiters
> such as [ ] and ( ). The same technique fails with < > however, and I
> cannot find a workaround,
>
> grid.text(expression(bgroup("<",atop(x,y),">")))
>
> Error in bgroup("<", atop(x, y), ">") : invalid
group delimiter
>
> Regards,
>
> baptiste
>
> sessionInfo()
> R version 2.11.1 (2010-05-31)
> x86_64-apple-darwin9.8.0
>
> locale:
> [1] en_GB.UTF-8/en_GB.UTF-8/C/C/en_GB.UTF-8/en_GB.UTF-8
>
> attached base packages:
> [1] grid ? ? ?stats ? ? graphics ?grDevices utils ? ? datasets
> methods ? base
>
> other attached packages:
> [1] TeachingDemos_2.7
>
> loaded via a namespace (and not attached):
> [1] tools_2.11.1
>