That is the documented behaviour, not a bug!
BTW, df is the F density function.
If you want an exact match, use df[match("aa", names(df))]
On Wed, 12 Jan 2005 [EMAIL PROTECTED] wrote:
Full_Name: Marc Mamin
Version: 1.8, 2.0.0
OS: Windows & Linux
Submission from: (NULL) (217.17.202.254)
Using only the beginning of a column name will match it:
aaa<-1
df<-as.data.frame(aaa)
names(df)
[1] "aaa"
df$a
[1] 1 !!!!!!!!! (I expect df$a to be undefind)
Where did you read that?
df$x
NULL
Compare with:
df["aaa"]
aaa
1 1
df["a"]
Error in "[.data.frame"(df, "a") : undefined columns selected
Here another example that underline how problematic this issue can be:
aa1<-1
aa2<-2
df<-as.data.frame(aa1,aa2)
df$aa
[1] 1 (only the first matching column is retrieved)
--
Brian D. Ripley, [EMAIL PROTECTED]
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 272866 (PA)
Oxford OX1 3TG, UK Fax: +44 1865 272595
______________________________________________
R-devel@stat.math.ethz.ch mailing list
https://stat.ethz.ch/mailman/listinfo/r-devel
