On 11-01-03 7:44 PM, stvienna wiener wrote:
Dear List,
Is it possible to have function names like ∀ (unicode universal quantifier)?
This question is inspired by agda source code, which supports this.
http://www.cs.nott.ac.uk/~nad/listings/lib-0.4/Algebra.html
It would be handy to use. My guess is, however, that it's not supportet in R.
Why not just try it? I get this:
> ∀ <- 1
Error: unexpected input in "‚"
> `∀` <- 1
i.e. it is seen as a non-syntactic name, so needs backquotes to be used,
but then it's fine (except it's probably a bad idea, since non-UTF8
systems will have trouble with it). Looks like the error message needs
fixing.
I was surprised how hard it was to find this documented, but it is there
in the Introduction to R manual in section 1.8, "R commands, case
sensitivity, etc." Someday someone should add this to the Language
Definition manual. The rule is that syntactic names need to start with
. or a letter, and contain only letters, digits, . and _. The confusing
part is that "letter" doesn't have a universal definition, so the manual
suggests limiting them to ASCII letters.
Duncan Murdoch
______________________________________________
[email protected] mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
