Also, while any character string is allowed, the use of strings
that are not legal names limits their utility, especially for the
columns of a data.frame, which could normally be used in a formula for
something like "lm" or even more general using "with" or "attach".
hope this helps. spencer graves
Prof Brian Ripley wrote:
On Thu, 13 Jan 2005, [ISO-8859-1] Romain Fran�ois wrote:
Christoph Scherber a �crit :
Dear Reinhold,
All entries are allowed except "price swap" or "price_swap"
As a matter of fact, the syntax price_swap is now allowed (since R
1.9.1 I think). The rest is a choice issue ... deprends on you.
Even "price swap" is allowed, but you will have to work a bit harder,
e.g. call data.frame() with check.names=FALSE and quote the name
(preferably with backticks) when you want to use it.
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