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 <ppe...@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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Hervé Pagès
Program in Computational Biology
Division of Public Health Sciences
Fred Hutchinson Cancer Research Center
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