On Sep 10, 2010, at 9:42 AM, Hadley Wickham wrote:
I'm having trouble parsing this. What exactly do you want to do?
1 - Put a list as an element of a data.frame. That's quite
convenient for my pricing function.
I think this is a really bad idea. data.frames are not meant to be
used in this way. Why not use a list of lists?
It can be very convenient, but I suspect the original poster is
confused about the different between vectors and lists.
I wouldn't be surprised if someone were confused, since my reading of
some (but not all) of the help documents has led me to think that
lists _were_ vectors, just not vectors of atomic mode. And one oft-
illustrated method for creating a list is: alist <-
vector(mode="list", length=10). I am perhaps less confused than I was
two years ago but my confusion about all the possible permutations of
mode, typeof, expression, formula, and class and the extraction
methods therefrom definitely persists. I think the authors of the
documentation are of divided opinion or usage on this topic.
Best;
David.
Hadley
--
Assistant Professor / Dobelman Family Junior Chair
Department of Statistics / Rice University
http://had.co.nz/
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David Winsemius, MD
West Hartford, CT
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