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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