>>> 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 the right. For example a + b %in% a expands to the
formula a + a:b. "
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