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.
You can set up the check.names argument to FALSE when you call data.frame().
HTH,
Ivan
-------- Message original --------
Sujet: [R] Column name containing "-"
Date : Tue, 24 Jan 2012 20:34:07 +1100
De : Mark Seeto <markse...@gmail.com>
Pour : r-help@r-project.org
I'm trying to create a data frame in which some of the column names
contain a dash "-". A simple example:
d<- data.frame(x = c(0, 1))
d<- data.frame(d, y = c(0,1))
names(d)[2]<- "a.-5"
d
x a.-5
1 0 0
2 1 1
d<- data.frame(d, y = c(0,1))
d
x a..5 y
1 0 0 0
2 1 1 1
names(d)[2]<- "a.-5"
d
x a.-5 y
1 0 0 0
2 1 1 1
Why does the "a.-5" column name change to "a..5" when another column is added?
Thanks,
Mark Seeto
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--
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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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
