when i use a plot with xlab=expression(infinity), it shows ∞, but angleleft stays ascii. using expression(bgroup(angleleft, x, angleright)) says “invalid group delimiter”
And the bug is? Where is the direct use of angleleft/right documented? How to use them is an example in ?plotmath.
i filed this as feature request/enhancement, not bug. and the feature request is that the smbol font already contains the angled brackets, so i’d like to use them. they are just not hardcoded like rceil and friends: https://github.com/lgautier/R-3-0-branch-alt/blob/master/src/main/plotmath.c#L1930 also, the only special group delimiters that are documented (as example) are lceil and rceil, so it would also be useful to actually document which group delimiters are valid: "(" ")" "[" "]" "{" "}" "|" "||" "." "" lfloor rfloor lceil rceil hopefully soon langle and rangle or similar, and the unicode versions of floor, ceil and angled brackets.
It's documented (where Prof. Ripley suggested you look) that these are rightangle and leftangle.
Whoops, title was wrong.
also plot(0, xlab=expression(leftangle)) still shows the text, not the symbol