Also perhaps a surprise that the behavior depends on the mode of the NA. > is.na(as.character(list(NA_real_))) [1] FALSE > is.na(as.character(list(NA_character_))) [1] TRUE
Does this mean deparse() preserves NA-ness for NA_character_ but not NA_real_? -----Original Message----- From: R-devel [mailto:r-devel-boun...@r-project.org] On Behalf Of Hervé Pagès Sent: Monday, January 22, 2018 2:01 PM To: William Dunlap <wdun...@tibco.com>; Patrick Perry <ppe...@stern.nyu.edu> Cc: r-devel@r-project.org Subject: Re: [Rd] as.character(list(NA)) 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 >> >> ______________________________________________ >> R-devel@r-project.org mailing list >> https://urldefense.proofpoint.com/v2/url?u=https-3A__stat.ethz.ch_mailman_listinfo_r-2Ddevel&d=DwICAg&c=eRAMFD45gAfqt84VtBcfhQ&r=BK7q3XeAvimeWdGbWY_wJYbW0WYiZvSXAJJKaaPhzWA&m=VbamM9XRQOlfBakrmlrmQZ7DLgXZ-hhhFeLD-fKpoCo&s=Luhqwpr2bTltIA9Cy7kA4gwcQh16bla0S6OVe3Z09Xo&e= >> > > [[alternative HTML version deleted]] > > ______________________________________________ > R-devel@r-project.org mailing list > https://urldefense.proofpoint.com/v2/url?u=https-3A__stat.ethz.ch_mailman_listinfo_r-2Ddevel&d=DwICAg&c=eRAMFD45gAfqt84VtBcfhQ&r=BK7q3XeAvimeWdGbWY_wJYbW0WYiZvSXAJJKaaPhzWA&m=VbamM9XRQOlfBakrmlrmQZ7DLgXZ-hhhFeLD-fKpoCo&s=Luhqwpr2bTltIA9Cy7kA4gwcQh16bla0S6OVe3Z09Xo&e= > -- Hervé Pagès Program in Computational Biology Division of Public Health Sciences Fred Hutchinson Cancer Research Center 1100 Fairview Ave. N, M1-B514 P.O. Box 19024 Seattle, WA 98109-1024 E-mail: hpa...@fredhutch.org Phone: (206) 667-5791 Fax: (206) 667-1319 ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel