[R] pairlists (was: data manipulation function descriptions)

Warnes, Gregory R gregory_r_warnes at groton.pfizer.com
Fri Feb 14 16:58:03 CET 2003

> -----Original Message-----
> From: Luke Tierney [mailto:luke at stat.uiowa.edu]

> R does not provide a pairlist data structure. This creates a dilemma
> when translating some list-based xlispstat code, or, more
> importantly, when implementing an algorithm for which parilists are
> the natural data structure to use.
> ...
> Pairlists were and still are used internally for many things. 
> ...

Wouldn't it, therefore, make sense to provide a 'pairlist' package which
exposes the internal pairlist structure and provides appropriate functions
(car, cdr, ...), instead of expecting people to keep re-implementing these


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