On Fri, Jul 2, 2010 at 8:16 AM, Hadley Wickham had...@rice.edu wrote:
?formula in R 2.9.2 says in para 2:
The %in% operator indicates that the terms on its left are nested
within those on the right. For example a + b %in% a expands to the
formula a + a:b.
Ooops, missed that. So b %in% a =
Hi all,
In preparation for teaching a class next week, I've been reviewing R's
standard modelling algebra. I've used it for a long time and have a
pretty good intuitive feel for how it works, but would like to
understand more of the technical details. The best (online) reference
I've found so far
Hadley Wickham had...@rice.edu 02/07/2010 14:59:53
Where is %in% documented within R? I'm pretty sure it's a different
action to ?%in%, and it's not mentioned in ?formula
?formula in R 2.9.2 says in para 2:
The %in% operator indicates that the terms on its left are nested
within those on
?formula in R 2.9.2 says in para 2:
The %in% operator indicates that the terms on its left are nested
within those on the right. For example a + b %in% a expands to the
formula a + a:b.
Ooops, missed that. So b %in% a = a:b, and that's what's meant by
different coding.
Hadley
--
Hadley,
The S language modeling language was designed with Wilkinson and
Rogers in mind. The notation was changed from their paper to
retain consistency with the parsing rules for ordinary algebra in
S. I think of : as an indicator of an indexing system into the
dummy variables. It is not an
On Fri, 2 Jul 2010, Hadley Wickham wrote:
Hi all,
In preparation for teaching a class next week, I've been reviewing R's
standard modelling algebra. I've used it for a long time and have a
pretty good intuitive feel for how it works, but would like to
understand more of the technical details.
Hadley Wickham hadley at rice.edu
Where is %in% documented within R? I'm pretty sure it's a different
action to ?%in%, and it's not mentioned in ?formula
You find the documentation for operators like -, %in%, if, etc by putting
the operators between
qoutes
?%in%
?-
?if
Regards,
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