[Rd] What is pairlist in R-ints.pdf?
simon.urbanek at r-project.org
Wed Mar 3 17:49:50 CET 2010
On Mar 3, 2010, at 11:29 , blue sky wrote:
> R-ints.pdf mentions pairlist with the reference to mit-scheme.
> However, it is not clear to me what 'pairlist' exactly refers to, as
> I don't find the definition for it. Does a 'pairlist' in R
> equivalent to a pair or a list (which is essentially a pair whose
> cdr is a list) in mit-scheme?
pairlist is short for "dotted pair list" (see ?pairlist) which is a
syntax for specifying linked lists as ( CAR . CDR ). Since the term
"list" has a different meaning in R, using just "list" would be
ambiguous (in the current R lists are implemented as generic vectors,
not as linked lists).
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