On 01/22/2018 01:02 PM, William Dunlap wrote:
I tend to avoid using as.<type> functions on lists, since they act oddly
in several ways.
E.g, if the list "L" consists entirely of scalar elements then
as.numeric(L) acts like
as.numeric(unlist(L)) but if any element is not a scalar there is an
error.
FWIW personally I see this as a nice feature and use as.numeric(L)
instead of as.numeric(unlist(L) in places where I'd rather fail than
getting something that is not parallel to the input.
H.
as.character()
does not seem to make a distinction between the all-scalar and
not-all-scalar cases
but does various things with NA's of various types.
Bill Dunlap
TIBCO Software
wdunlap tibco.com
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On Mon, Jan 22, 2018 at 11:14 AM, Robert McGehee
<rmcge...@walleyetrading.net <mailto:rmcge...@walleyetrading.net>> wrote:
Also perhaps a surprise that the behavior depends on the mode of the NA.
> is.na
<https://urldefense.proofpoint.com/v2/url?u=http-3A__is.na&d=DwMFaQ&c=eRAMFD45gAfqt84VtBcfhQ&r=BK7q3XeAvimeWdGbWY_wJYbW0WYiZvSXAJJKaaPhzWA&m=TBOnlxYy_MjXJqxLqI8WB2WWHNMtc8qw5gxsqUoyoH4&s=z8HTNapemGDhhH0ICUN2hgJrtUcxsgM96mcUwD8QzQk&e=>(as.character(list(NA_real_)))
[1] FALSE
> is.na
<https://urldefense.proofpoint.com/v2/url?u=http-3A__is.na&d=DwMFaQ&c=eRAMFD45gAfqt84VtBcfhQ&r=BK7q3XeAvimeWdGbWY_wJYbW0WYiZvSXAJJKaaPhzWA&m=TBOnlxYy_MjXJqxLqI8WB2WWHNMtc8qw5gxsqUoyoH4&s=z8HTNapemGDhhH0ICUN2hgJrtUcxsgM96mcUwD8QzQk&e=>(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
<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 <mailto:wdun...@tibco.com>>;
Patrick Perry <ppe...@stern.nyu.edu <mailto:ppe...@stern.nyu.edu>>
Cc: r-devel@r-project.org <mailto: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
<https://urldefense.proofpoint.com/v2/url?u=http-3A__tibco.com&d=DwMFaQ&c=eRAMFD45gAfqt84VtBcfhQ&r=BK7q3XeAvimeWdGbWY_wJYbW0WYiZvSXAJJKaaPhzWA&m=TBOnlxYy_MjXJqxLqI8WB2WWHNMtc8qw5gxsqUoyoH4&s=XiTysBsoZb4M91NAS4DK6nK982wAf7JGpRSDrXioQ3A&e=>
>
> On Sat, Jan 20, 2018 at 7:43 AM, Patrick Perry
<ppe...@stern.nyu.edu <mailto:ppe...@stern.nyu.edu>> wrote:
>
>> As of R Under development (unstable) (2018-01-19 r74138):
>>
>>> as.character(list(NA))
>> [1] "NA"
>>
>>> is.na
<https://urldefense.proofpoint.com/v2/url?u=http-3A__is.na&d=DwMFaQ&c=eRAMFD45gAfqt84VtBcfhQ&r=BK7q3XeAvimeWdGbWY_wJYbW0WYiZvSXAJJKaaPhzWA&m=TBOnlxYy_MjXJqxLqI8WB2WWHNMtc8qw5gxsqUoyoH4&s=z8HTNapemGDhhH0ICUN2hgJrtUcxsgM96mcUwD8QzQk&e=>(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
1100 Fairview Ave. N, M1-B514
P.O. Box 19024
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E-mail: hpa...@fredhutch.org <mailto:hpa...@fredhutch.org>
Phone: (206) 667-5791 <tel:%28206%29%20667-5791>
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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
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