Duncan:
Thanks for taking a stab at my questions -- in following up I discovered the
root of my difficulties -- I had not noticed document R-lang.pdf ("R Language
Definition"). This clarifies a great deal.
FWIW, it seems to me that a number of things I was hung up on (and which you
discussed) revolved around:
1. Confusion between "frame" and "data.frame". R-lang.pdf has several sections
that touch on each of these, from which it's more clear (though not explicit)
that these are not the same things. (Problematic: frame is mentioned first, is
a more fundamental concept, yet has no entry in the Table of Contents, while
data.frame does have an entry). (And the converse is true of the index!).
2. Ambiguity in the docs regarding environment, frame (and also regarding
closely-related concepts closure and enclosure).
Anyhow, I'm now in a much happier state :-).
Regarding your questions:
>> 1. data.frame:
>> Ref[m]an p84: 'A data frame is a list of variables of the same length with
>> unique row names, given class "data.frame".'
>Which manual are you looking at? The "reference index" (refman.pdf)?
>[...] that statement may not be present in the current release
Yes, the doc titled "R: A Language and Environment for Statistical Computing
Reference Index". This is in section I "The base package", subsection
"data.frame", which was on page 84 of refman.pdf (which I downloaded yesterday,
but now don't know where from) or on page 86 of fullrefman.pdf (downloaded
today -- ie: current release).
(And point understood on the suggestions about reporting doc issues -- though
tracking them down to line numbers in the SVN is a bit optimistic, not to
mention a moving target :-)
-----------
Anyhow, thanks again for the response.
Graham
---------------------------------------------------
Graham Wideman
Resources for programmable diagramming at:
http://www.diagramantics.com
Brain-related resources:
http://wideman-one.com
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