Re: [Rd] How to build a list with missing values? What is missing, anyway?

From: Bert Gunter <gunter.berton_at_gene.com>
Date: Thu, 04 Oct 2012 20:07:53 -0700

On Thu, Oct 4, 2012 at 6:31 PM, Peter Meilstrup <peter.meilstrup_at_gmail.com> wrote:
> On Thu, Oct 4, 2012 at 6:12 PM, Bert Gunter <gunter.berton@gene.com> wrote:
>> The R Language definition manual explains all of this. Read it.
>
> I always reread that before I post to this list.
>
> The only relevant mention of "missing" in the R Language Definition
> that I could find were in section 4.1.2 on page 25, and that section

Page 15, "NA handling" seems "relevant, " as does ?NA (at the command prompt in R).
See also 2.5 in the Introduction to R tutorial.

> did not answer anything about "missing" as a special symbol (e.g. that
> my be put in a formal argument list.)
>
> There is another mention of `...` in section 4.3.2 and it does not

See section 2.1.9 of the Language Definition manual and 10.4 of Intro to R.

> explain some things, such as under what circumstances one would get a
> "`...` used in incorrect context" error.

How could it possibly know that?

>
> Peter
>
>>>
>>> Thanks.
>>>
>>> Just so I have my mental model correct, I'm gathering that missing/``
>>> is a symbol that the interpreter has a special rule for -- evaluating
>>> it raises an error, as opposed to objects that evaluate to themselves
>>> or variable names that evaluate to objects.
>>>
>>> Does the same sort of thing explain the behavior of `...`? When the
>>> interpreter comes across `...` in the arguments during evaluation of a
>>> call, it trips a special argument-interpolating behavior?
>>>
>>> Peter
>>>
>>> ______________________________________________
>>> R-devel_at_r-project.org mailing list
>>> https://stat.ethz.ch/mailman/listinfo/r-devel
>>
>>
>>
>> --
>>
>> Bert Gunter
>> Genentech Nonclinical Biostatistics
>>
>> Internal Contact Info:
>> Phone: 467-7374
>> Website:
>> http://pharmadevelopment.roche.com/index/pdb/pdb-functional-groups/pdb-biostatistics/pdb-ncb-home.htm

-- 

Bert Gunter
Genentech Nonclinical Biostatistics

Internal Contact Info:
Phone: 467-7374
Website:
http://pharmadevelopment.roche.com/index/pdb/pdb-functional-groups/pdb-biostatistics/pdb-ncb-home.htm

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Received on Fri 05 Oct 2012 - 11:58:01 GMT

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