On Sep 12, 2010, at 6:15 AM, baptiste auguie wrote:
Thanks everyone. I've also had a look at plotmath.c where bgroup is
defined for "[", "{", "(", "." but not "<". It seems quite trivial to
add it, at first sight, however there is a part that I don't
understand in the RenderDelim routine,
static BBOX RenderDelim(int which, double dist, int draw,
mathContext *mc,
pGEcontext gc, pGEDevDesc dd)
{
// [... snipped ...]
case '(':
top = 230; ext = 231; bot = 232; mid = 0;
break;
case ')':
top = 246; ext = 247; bot = 248; mid = 0;
break;
These integer codes make no sense to me, I have no clue which ones I
should use for < and >.
Does this help? (I think they are using Symbol PS fonts with decimal
indexing.)
> as.octmode(c(230, 231, 232, 246, 247, 248) )
[1] "346" "347" "350" "366" "367" "370"
plot(1,1, xlab= expression(
symbol("\346")~ # upper 1/3 of left paren
symbol("\347")~ # to left of center bar
symbol("\350")~ # lower 1/3 of left paren
symbol("\366")~ # upper 1/3 of right paren
symbol("\367")~ # to right of center bar
symbol("\370") ) ) # lower 1/3 of right paren
(caveat: Maybe not standard glyph-names.)
I added octal annotation to the TestChars(font=5) call that the points
help page offers:
TestChars(font=5)
for(j in 1:14) {
for(i in 0:16){
text(i+0.2, j+.6, labels=as.octmode(i+(j+1)*16), cex=.5)}}
I do not see a trio or pair of glyphs that would form an angle bracket.
--
David.
As far as I understand these codes might
correspond to extended ascii characters whose boundaries and positions
we want to borrow. Then again, maybe it's something else entirely.
Any hints?
Best wishes,
baptiste
On 12 September 2010 03:27, David Winsemius <dwinsem...@comcast.net>
wrote:
On Sep 11, 2010, at 9:00 PM, Peter Ehlers wrote:
On 2010-09-11 16:14, Dennis Murphy wrote:
Hi Baptiste,
You need to use the symbol("\nnn") concept, where nnn denotes the
octal
symbol number. For< it's 074 and for> it's 076. This little
test seemed
to
work:
plot(1, 1, main = expression(symbol("\074")~'x, y'~symbol("\076")))
HTH,
Dennis
It's a matter of taste, but I would use "\341" and "\361".
However, these are still not scalable, AFAICS.
Not exactly scalable angles, but you can fake it:
plot(1, 1, main = expression(symbol("\341")~scriptstyle( atop(x,y)
)~symbol("\361")), cex.main=3)
scriptstyle shrinks the inner atop() material, and since I tested
on a Mac
it should work for Baptiste.
--
David.
-Peter Ehlers
On Sat, Sep 11, 2010 at 10:01 AM, baptiste auguie<
baptiste.aug...@googlemail.com> wrote:
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.aug...@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
David Winsemius, MD
West Hartford, CT
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