[R] the underscore ("_") in variable name
Prof Brian D Ripley
ripley at stats.ox.ac.uk
Mon Oct 2 22:58:29 CEST 2000
On 2 Oct 2000, Peter Dalgaard BSA wrote:
> Murray Jorgensen <maj at waikato.ac.nz> writes:
> > This seems as good a place as any to gripe about the R/S assignment symbol
> > "<-" ! What absolute fiend said: "now let's see, this is the symbol that
> > will be most used in this language, so let's represent it by a
> > two-character string, and further, let's have the two characters in
> > different cases so that it will require a change of case mid-stream!".
> Nicklaus Wirth? (Pascal has ":=")
> Actually, on a Danish keyboard "<-" is two unshifted symbols whereas
> the underscore is a shifted dash, so it is pretty much a toss-up for
> me. You don't want to know where they put the rest of the special
> symbols, though...
On the Italian and Spanish keyboards I was using last month, ~ is not even
on the keyboard. (alt+0126 became familiar.)
Svr4 allows = for assignment in most circumstances, but once you start
using it you discover the exceptions really bite. As far as I recall Bill
changed <- to = at a late stage in the notes of the joint course we gave,
and we then found 22 examples where it was wrong.
Brian D. Ripley, ripley at stats.ox.ac.uk
Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
University of Oxford, Tel: +44 1865 272861 (self)
1 South Parks Road, +44 1865 272860 (secr)
Oxford OX1 3TG, UK Fax: +44 1865 272595
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