[Rd] Incorrect display of b[hat((a))] expression in plots
Henrik Bengtsson
hb at maths.lth.se
Tue Jul 27 19:12:14 CEST 2004
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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