From hpages at fredhutch.org  Mon Jan 22 20:01:02 2018
From: hpages at fredhutch.org (=?UTF-8?B?SGVydsOpIFBhZ8Oocw==?=)
Date: Mon, 22 Jan 2018 11:01:02 -0800
Subject: [Rd] as.character(list(NA))
In-Reply-To: <CAF8bMcb3ON02efFcQi0rgErRyNxWt==z2sJ5_wuXytsFE7emLA@mail.gmail.com>
References: <5A6363B8.3030305@stern.nyu.edu>
 <CAF8bMcb3ON02efFcQi0rgErRyNxWt==z2sJ5_wuXytsFE7emLA@mail.gmail.com>
Message-ID: <b2edc1e5-a672-6070-4cf2-a572c030f961@fredhutch.org>

On 01/20/2018 08:24 AM, William Dunlap via R-devel wrote:
> I believe that for a list as.character() applies deparse()  to each element
> of the list.  deparse() does not preserve NA-ness, as it is intended to
> make text that the parser can read.
> 
>> str(as.character(list(Na=NA, LglVec=c(TRUE,NA),
> Function=function(x){x+1})))
>   chr [1:3] "NA" "c(TRUE, NA)" "function (x) \n{\n    x + 1\n}"
> 

This really comes as a surprise though since coercion to all the
other atomic types (except raw) preserve the NAs.

And also as.character(unlist(list(NA))) preserves them.

H.

> 
> Bill Dunlap
> TIBCO Software
> wdunlap tibco.com
> 
> On Sat, Jan 20, 2018 at 7:43 AM, Patrick Perry <pperry at stern.nyu.edu> wrote:
> 
>> As of R Under development (unstable) (2018-01-19 r74138):
>>
>>> as.character(list(NA))
>> [1] "NA"
>>
>>> is.na(as.character(list(NA)))
>> [1] FALSE
>>
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-- 
Herv? Pag?s

Program in Computational Biology
Division of Public Health Sciences
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[Rd] as.character(list(NA))
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