By "it works anyway", I mean that you can have a dash in a column name,
there is no error or even warning.
I guess that some functions would throw an error or warning, depending
on the requirements, but data.frame() doesn't.
Ivan
Le 24/01/12 15:35, David Winsemius a écrit :
On Jan 24, 2012, at 4:44 AM, Ivan Calandra wrote:
Hi Mark,
I cannot tell you why (maybe someone else can), but the check.names
argument to data.frame() interpret "a.-5" as an unvalid name and
convert to to a valid one. What I don't understand is why it isn't
"valid" since it works anyway.
The dash is not a valid character for column names. What do you mean
by "it works anyway"?
--
Ivan CALANDRA
Université de Bourgogne
UMR CNRS/uB 6282 Biogéosciences
6 Boulevard Gabriel
21000 Dijon, FRANCE
+33(0)3.80.39.63.06
ivan.calan...@u-bourgogne.fr
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