[R] how to use "..."
dwinsemius at comcast.net
Mon Jan 21 00:23:51 CET 2013
On Jan 20, 2013, at 11:46 AM, Duncan Murdoch wrote:
> On 13-01-20 2:28 PM, Steve Taylor wrote:
>>> From: Duncan Murdoch
>>> Maybe we just need a manual on how to use the existing help
>>> system. But
>>> I suspect people who won't read the existing manuals won't read that
>>> one, either.
>> Duncan, I assume you're being facetious. Every R user soon learns
>> to use help() and help.search() or their equivalents. We don't
>> need a manual to teach that.
> There are other parts of the help system that you don't appear to
> know about. Run help.start() for the main index page. help() is
> kind of a shortcut to the section labelled "Packages".
> help.search() gets you to "Search Engine & Keywords". There are 15
> other headings to explore as well.
On my Mac after a very long wait it appears I get all of the functions
in every installed package that have a three-dots argument in their
argument list displayed in the Usage sections. That does not seem very
"help"-ful. I tried limiting with keyword="programming", that did not
appear effective. I wasn't able to figure out from the
help(help.search) page what I need to do to constrict to non-Usage
matches yet expand to items linked from the help.start() page.
If I just search with a browser for "..." in "Introduction to R" I get
what I consider to be useful material.
>>>> Rolf Turner wrote:
>>>>> The "help" facility is applicable to functions and data sets.
>>>>> It is not
>>>>> or intended to give "help" with respect to R syntax (with the
>>>>> exception of
>>>>> the basic syntax of the operators --- unary and binary --- and the
>>>>> rules of precedence).
>> Then why are there help
>> pages ?":::", ?"for", ?"NA_character_", ?".C" and ?"??" but
>> not ?"..." ?!
> Those are all functions or other objects, while ... is not. There
> are examples of topic aliases that are not objects, e.g. ?Syntax,
> but mostly Rolf is right. Most discussion of the syntax is in the
> Duncan Murdoch
> R-help at r-project.org mailing list
> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
David Winsemius, MD
Alameda, CA, USA
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