[Rd] New R function is.nana = is.na & !is.nan

[Jan Gorecki]

"nana" is meant to express "NA, really NA".
Your suggestion sounds good.

On Thu 2 Jan, 2020, 3:38 AM Pages, Herve, <hpages using fredhutch.org> wrote:

> Happy New Year everybody!
>
> The name (is.nana) doesn't make much sense to me. Can you explain it?
>
> One alternative would be to add an extra argument (e.g. 'strict') to
> is.na(). FALSE by default, and ignored (with or w/o a warning) when the
> type of 'x' is not "numeric".
>
> H.
>
>
> On 12/31/19 22:16, Jan Gorecki wrote:
> > Hello R-devel,
> >
> > Best wishes in the new year. I am writing to kindly request new R
> > function so NA_real_ can be more easily detected.
> > Currently if one wants to test for NA_real_ (but not NaN) then extra
> > work has to be done: `is.na(x) & !is.nan(x)`
> > Required functionality is already at C level so to address my request
> > there is not that much to do.
> > Kevin Ushey made a nice summary of current R C api in:
> >
> https://urldefense.proofpoint.com/v2/url?u=https-3A__stackoverflow.com_a_26262984_2490497&d=DwICAg&c=eRAMFD45gAfqt84VtBcfhQ&r=BK7q3XeAvimeWdGbWY_wJYbW0WYiZvSXAJJKaaPhzWA&m=oWT1wDiy7pogVlJHGtdOoM3zdB45t9zZVyGYU8qcOgo&s=zFj3lh-N_YlNBRlDKeO-aTs0Bf2qtWLUHKlw_nh2Q4o&e=
> > Pasting related part below, extra row added by me is a requested feature.
> >
> >      +---------------------+
> >      | C fun    | NaN | NA | R fun
> >      +---------------------+
> >      | ISNAN    |  t  | t  | is.na
> >      | R_IsNaN  |  t  | f  | is.nan
> >      | ISNA     |  f  | t  | is.na && !is.nan
> >      | R_IsNA   |  f  | t  | is.na && !is.nan
> >      +---------------------+
> >      +---------------------+
> >      | R fun    | NaN | NA | C fun
> >      +---------------------+
> >      | is.na    |  t  | t  | ISNAN
> >      | is.nan   |  t  | f  | R_IsNaN
> >      +---------------------+
> >      | is.nana  |  f  | t  | R_IsNA
> >      +---------------------+
> >
> > Strictly speaking, I am asking for a new R function:
> >
> >      is.nana <- function(x) if (typeof(x)=="numeric")
> > .Primitive("is.nana") else .Primitive("is.na")
> >
> > Then probably a copy of C function `do_isnan` as `do_isnana` with a
> > minor change from `R_IsNaN` to `R_IsNA`.
> >
> > Best,
> > Jan Gorecki
> >
> > ______________________________________________
> > R-devel using 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=oWT1wDiy7pogVlJHGtdOoM3zdB45t9zZVyGYU8qcOgo&s=tCCxZtQj30QrtAYORMODT-OnjeKiXxiF0qlZtgyj1Mc&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: hpages using fredhutch.org
> Phone:  (206) 667-5791
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>

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