ake it doable in the above example.
From: Adrian Dușa mailto:dusa.adr...@unibuc.ro> >
Sent: Monday, May 24, 2021 8:18 AM
To: Greg Minshall mailto:minsh...@umich.edu> >
Cc: Avi Gross mailto:avigr...@verizon.net> >; r-devel
mailto:r-devel@r-project.org> >
Subject: Re: [
Hi all,
When first hearing about ALTREP I've wondered how it might be able to be
used to store special missing value information - how can we learn more
about implementing ALTREP classes? The idea of carrying around a "meaning
of my NAs" vector, as Gabe said, would be very interesting!
I've done
Hi All,
So there is a not particularly active, but closely curated (ie everything
on there should be good in terms of principled examples) github
organization of ALTREP examples: https://github.com/ALTREP-examples.
Currently there are two examples by Luke (including a package version of
the memory
On Mon, May 24, 2021 at 5:47 PM Gabriel Becker
wrote:
> Hi Adrian,
>
> I had the same thought as Luke. It is possible that you can develop an
> ALTREP that carries around the tagging information you're looking for in a
> way that is more persistent (in some cases) than R-level attributes and
> mo
Hi Adrian,
I had the same thought as Luke. It is possible that you can develop an
ALTREP that carries around the tagging information you're looking for in a
way that is more persistent (in some cases) than R-level attributes and
more hidden than additional user-visible columns.
The downsides to t
On Mon, May 24, 2021 at 4:40 PM Bertram, Alexander via R-devel <
r-devel@r-project.org> wrote:
> Dear Adrian,
> SPSS and other packages handle this problem in a very similar way to what I
> described: they store additional metadata for each variable. You can see
> this in the way that SPSS organiz
Hi Taras,
On Mon, May 24, 2021 at 4:20 PM Taras Zakharko
wrote:
> Hi Adrian,
>
> Have a look at vctrs package — they have low-level primitives that might
> simplify your life a bit. I think you can get quite far by creating a
> custom type that stores NAs in an attribute and utilizes vctrs proxy
Dear Adrian,
SPSS and other packages handle this problem in a very similar way to what I
described: they store additional metadata for each variable. You can see
this in the way that SPSS organizes it's file format: each "variable" has
additional metadata that indicate how specific values of the va
Hi Adrian,
Have a look at vctrs package — they have low-level primitives that might
simplify your life a bit. I think you can get quite far by creating a custom
type that stores NAs in an attribute and utilizes vctrs proxy functionality to
preserve these attributes across different operations.
Dear Alex,
Thanks for piping in, I am learning with each new message.
The problem is clear, the solution escapes me though. I've already tried
the attributes route: it is going to triple the data size: along with the
additional (logical) variable that specifies which level is missing, one
also nee
On Mon, May 24, 2021 at 2:11 PM Greg Minshall wrote:
> [...]
> if you have 500 columns of possibly-NA'd variables, you could have one
> column of 500 "bits", where each bit has one of N values, N being the
> number of explanations the corresponding column has for why the NA
> exists.
>
The mere
Dear Adrian,
I just wanted to pipe in and underscore Thomas' point: the payload bits of
IEEE 754 floating point values are no place to store data that you care
about or need to keep. That is not only related to the R APIs, but also how
processors handle floating point values and signaling and non-s
On Mon, May 24, 2021 at 1:31 PM Tomas Kalibera
wrote:
> [...]
>
> For the reasons I explained, I would be against such a change. Keeping the
> data on the side, as also recommended by others on this list, would allow
> you for a reliable implementation. I don't want to support fragile package
> c
Adrian,
> If it was only one column then your solution is neat. But with 5-600
> variables, each of which can contain multiple missing values, to
> double this number of variables just to describe NA values seems to me
> excessive. Not to mention we should be able to quickly convert /
> import /
Hmm...
If it was only one column then your solution is neat. But with 5-600
variables, each of which can contain multiple missing values, to double
this number of variables just to describe NA values seems to me excessive.
Not to mention we should be able to quickly convert / import / export from
o
On 5/24/21 11:46 AM, Adrian Dușa wrote:
> On Sun, May 23, 2021 at 10:14 PM Tomas Kalibera
> mailto:tomas.kalib...@gmail.com>> wrote:
>
> [...]
>
> Good, but unfortunately the delineation between computation and
> non-computation is not always transparent. Even if an operation
> d
On Sun, May 23, 2021 at 10:14 PM Tomas Kalibera
wrote:
> [...]
>
> Good, but unfortunately the delineation between computation and
> non-computation is not always transparent. Even if an operation doesn't
> look like "computation" on the high-level, it may internally involve
> computation - so, r
s fine for that calculation too.
>
>
> -Original Message-
> From: R-devel On Behalf Of Adrian Du?a
> Sent: Sunday, May 23, 2021 2:04 PM
> To: Tomas Kalibera
> Cc: r-devel
> Subject: Re: [Rd] 1954 from NA
>
> Dear Tomas,
>
> I understand that perfectly, b
alues are due to reasons A/B/C then the added
columns works fine for that calculation too.
-Original Message-
From: R-devel On Behalf Of Adrian Du?a
Sent: Sunday, May 23, 2021 2:04 PM
To: Tomas Kalibera
Cc: r-devel
Subject: Re: [Rd] 1954 from NA
Dear Tomas,
I understand that perfec
On 5/23/21 8:04 PM, Adrian Dușa wrote:
> Dear Tomas,
>
> I understand that perfectly, but that is fine.
> The payload is not going to be used in any computations anyways, it is
> strictly an information carrier that differentiates between different
> types of (tagged) NA values.
Good, but unfor
Dear Tomas,
I understand that perfectly, but that is fine.
The payload is not going to be used in any computations anyways, it is
strictly an information carrier that differentiates between different types
of (tagged) NA values.
Having only one NA value in R is extremely limiting for the social
s
TLDR: tagging R NAs is not possible.
External software should not depend on how R currently implements NA,
this may change at any time. Tagging of NA is not supported in R (if it
were, it would have been documented). It would not be possible to
implement such tagging reliably with the current
> On Sunday, May 23, 2021, 10:45:22 AM EDT, Adrian Dușa
> wrote:
>
> On Sun, May 23, 2021 at 4:33 PM brodie gaslam via R-devel
> wrote:
> > I should add, I don't know that you can rely on this
> > particular encoding of R's NA. If I were trying to restore
> > an NA from some external format, I
On Sun, May 23, 2021 at 4:33 PM brodie gaslam via R-devel <
r-devel@r-project.org> wrote:
> I should add, I don't know that you can rely on this
> particular encoding of R's NA. If I were trying to restore
> an NA from some external format, I would just generate an
> R NA via e.g NA_real_ in the
I wrote about this once over here:
http://www.markvanderloo.eu/yaRb/2012/07/08/representation-of-numerical-nas-in-r-and-the-1954-enigma/
-M
Op zo 23 mei 2021 15:33 schreef brodie gaslam via R-devel <
r-devel@r-project.org>:
> I should add, I don't know that you can rely on this
> particular en
I should add, I don't know that you can rely on this
particular encoding of R's NA. If I were trying to restore
an NA from some external format, I would just generate an
R NA via e.g NA_real_ in the R session I'm restoring the
external data into, and not try to hand assemble one.
Best,
B.
On
This is because the NA in question is NA_real_, which
is encoded in double precision IEEE-754, which uses
64 bits. The "1954" is just part of the NA. The NA
must also conform to the NaN encoding for double precision
numbers, which requires that the "beginning" portion of
the number be "0x7ff0" (w
Dear R devs,
I am probably missing something obvious, but still trying to understand why
the 1954 from the definition of an NA has to fill 32 bits when it normally
doesn't need more than 16.
Wouldn't the code below achieve exactly the same thing?
typedef union
{
double value;
unsigned sh
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