On Nov 16, 2010, at 7:02 PM, José Fernando Zea Castro wrote:
Hello.
First, I'm thankful about your wonderful project.
However, I have serious worries about the reliability of R. I found
the next bug which I consider important because in my job everytime We
work with datanames like next. Please see below:
b=data.frame(matrix(1:9,ncol=3))
names(b)=c("q99","r88","s77")
b
q99 r88 s77
1 1 4 7
2 2 5 8
3 3 6 9
b$q9
[1] 1 2 3
Not only that but:
> b$q
[1] 1 2 3
Please note that the variable q9 does not exist in the dataframe, but
you can see that R
show q9 (as q99).
Read the section in ?Extract on "Character indices". The $ operator is
weird in other ways as well. Better to use [[ ]] therefore.
Thank in advanced
Cordially
José Fernando Zea Castro
Statistician Universidad Nacional Colombiana
--
David Winsemius, MD
West Hartford, CT
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