[Rd] Incorrect display of b[hat((a))] expression in plots

[Uwe Ligges]

Confirmed.

I might look at it during August, since the underlying code is not that 
new to me. If Paul (or anybody else from R Core) has not answered yet 
and there is not already a related bug report in the database, I'd 
suggest to submit a bug report.

Uwe

Henrik Bengtsson wrote:

> Hi, I am not sure if this is a bug or a non-implement feature of
> text-drawing functions with TeX-style expression, but hat() and some of its
> equals does not get the right "bounding boxes" if they are put in sub- or
> superscripts. For instance, for the expression 'b[hat(a)]' the hat() seems
> to shift 'hat(a)' too much to the right of 'b'. Try the below example and
> you'll see what I mean:
> 
> label <- list(
>   expression((b[sqrt(a)])),
>   expression((b[bar(a)])),
>   expression((b[widehat(a)])),
>   expression((b[widetilde(a)])),
>   expression((tilde(a))),
>   # Problematic:
>   expression((b[dot(a)])),
>   expression((b[ring(a)])),
>   expression((b[hat(a)])),
>   expression((b[tilde(a)])),
>   expression((b^dot(a))),
>   expression((b^ring(a))),
>   expression((b^hat(a))),
>   expression((b^tilde(a)))
> )
> 
> plot(NA, xlim=c(0,2), ylim=c(-1,length(label)))
> for (kk in seq(label))
>   text(1,length(label)-kk, label=label[[kk]])
> 
> The problem occurs for the postscript and png devices too (I haven't tried
> the others).
> 
> I'm on WindowsXP and "R version 1.9.1, 2004-06-21" (non-patched).
> 
> Best wishes
> 
> Henrik Bengtsson
> 
> Dept. of Mathematical Statistics @ Centre for Mathematical Sciences 
> Lund Institute of Technology/Lund University, Sweden (+2h UTC)
> +46 46 2229611 (off), +46 708 909208 (cell), +46 46 2224623 (fax)
> h b @ m a t h s . l t h . s e, http://www.maths.lth.se/~hb/
> 
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