[R] Calling R function from within C code

ripley@stats.ox.ac.uk ripley at stats.ox.ac.uk
Thu Jan 16 17:49:03 CET 2003

It's hard to know where to start from.  A pairlist is a linked list of R
objects, a generic vector (of mode list) is an array of pointers to R
objects.  They are just different (and I've simplified by ignoring 
tags/names).  A paired list has sequential access, a generic vector random 
access, but it is less expensive to append to / insert in a pairlist.

On Thu, 16 Jan 2003, Timur Elzhov wrote:

> On Thu, Jan 16, 2003 at 03:22:42PM +0000, ripley at stats.ox.ac.uk wrote:
> > That way.  It's a pairlist of arguments.  As that manual says
> Thank you, Mr. Ripley!
> But, it was interesing for me for a long - what is a principal
> difference between 'pairlist' and a "general" list?
> Why to access pairlist elements I need to use the strange macro
> like CAR(CDR(x)), and cannot do it by VECTOR_ELT(x, i) ?

Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

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