On Fri, 12 Dec 2008 18:27:02 +0100, hadley wickham <h.wick...@gmail.com> wrote:
or may be just
mtcars[cyl>3&last(20)]
or this is already too far?
This would be a considerable extension because then the selector would
need to know about all other variables in the dataset, and you'd need
someway of combining selectors with logical vectors.
If selector returns a logical vector then I really don't see where is the problem. Probably I am mistaken but
implementing mtcars[cyl>3] is not such a big deal. Just an operator `[.` start searching for "cyl"
from inside the "x" frame and not from parent.frame as it does now. It is just like putting
"with" inside '[', or not?
When started with R I was really disappointed that such a natural and intuitive
subsetting is not allowed, but instead lengthy and ackward
mtcars[mtcars$syl>3] is required.
R is an interactive language for 99% of the users and features like that(and
selectors indeed) would make a tremendous difference.
Regards,
SV.
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