On Sat, Jul 27, 2013 at 3:08 PM, Duncan Murdoch <murdoch.dun...@gmail.com> wrote: > Your question is a little ambiguous. All characters are allowed in object > names, but the parser will only recognize some of them if they are quoted in > backticks. > > The ones it recognizes without the backticks are ones that the C isalnum() > (or iswalnum()) function declares to be alphanumeric, plus . and _. Your > list above are all allowed, but locales are allowed to declare other > characters to be alpha. I wouldn't recommend using anything else, because > your code won't be recognized in other locales. > > The definitive reference for this is the source code, specifically > src/main/gram.y. There's some discussion in the Intro to R manual, section > 1.8. > Exactly what I was looking for. Thank you, Liviu
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