I'd like to pick up this thread started on 2019-04-11
(https://hypatia.math.ethz.ch/pipermail/r-devel/2019-April/077632.html).
Modulo all the other suggestions in this thread, would my proposal of
being able to disable forked processing via an option or an
environment variable make sense? I've pro
On 1/9/20 06:56, Stepan wrote:
> On 09. 01. 20 15:41, lille stor wrote:
>
>> I believe this could be done without creating side effects (e.g.
>> crash) as we are just talking about changing values.
A crash would certainly be an annoying "side effect" ;-)
As Stepan explained, data.frame objects
Note that in
> > quantile(c("1","2","3"),p=.5)
> Error in (1 - h) * qs[i] :
> argument non numérique pour un opérateur binaire
the default quantile type (7) does not work for non-numerics.
Quantile types 1 and 3 work as expected:
> quantile(c("1","2","3"),p=.5, type=1)
50%
"2"
> quantile(c(
Peter,
Thanks for the reply.
If that were the case, then should not the following be allowed to work with
ordered factors?
> median(factor(c("1", "2", "3"), ordered = TRUE))
Error in median.default(factor(c("1", "2", "3"), ordered = TRUE)) :
need numeric data
At least on the surface, if you
I think median() behaves as designed: As long as the argument can be ordered,
the "middle observation" makes sense, except when the middle falls between two
categories, and you can't define and average of the two candidates for a median.
The "sick man" would seem to be var(). Notice that it is a
On 09. 01. 20 15:41, lille stor wrote:
I believe this could be done without creating side effects (e.g.
crash) as we are just talking about changing values.
that is exactly the issue that my last two points warn about. Example:
a <- mtcars
.Call("my_innocent_function", a)
Would you expect th
On 1/9/20 1:03 PM, Ezra Tucker wrote:
Hi Lille,
Is it possible you're looking for tracemem() or inspect() ?
Please note these functions are only for debugging. They should never be
called from programs or packages. One should never try to manipulate
pointers from R directly or even hold them
Hello Lille,
raw data of a data.frame (or more precisely a list, because data.frame
is just a list with "data.frame" class) is an array of R specific data
structures (SEXP), so a generic C function will not be able to work with
them.
As a per-processing step, you may allocate an array for th
Jean-Luc,
Please keep the communications on the list, for the benefit of others, now and
in the future, via the list archive. I am adding r-devel back here.
I can't speak to the rationale in some of these cases. As I noted, it may be
(is likely) due to differing authors over time, and there may
> On Jan 9, 2020, at 7:40 AM, Lipatz Jean-Luc wrote:
>
> Hello,
>
> Is there a reason for the following behaviour?
>> mean(c("1","2","3"))
> [1] NA
> Warning message:
> In mean.default(c("1", "2", "3")) :
> l'argument n'est ni numérique, ni logique : renvoi de NA
>
> But:
>> var(c("1","2","3
Hi Lille,
To my understanding, there's no need to get the actual memory address of
the R data frame, as using .Call() or .External() can be used in a "call by
reference" way as well. This would be contrary to standard R behaviour, so
if you use that in a package, make sure you indicate this!
Ther
Hello,
Is there a reason for the following behaviour?
> mean(c("1","2","3"))
[1] NA
Warning message:
In mean.default(c("1", "2", "3")) :
l'argument n'est ni numérique, ni logique : renvoi de NA
But:
> var(c("1","2","3"))
[1] 1
And also:
> median(c("1","2","3"))
[1] "2"
But:
> quantile(c("1","
Hi Lille,
Is it possible you're looking for tracemem() or inspect() ?
> x <- data.frame(z = 1:10)> tracemem(x)[1] "<0x55aa743e0bc0>"
> x[1] <- 2Ltracemem[0x55aa743e0bc0 -> 0x55aa778f6ad0]:
tracemem[0x55aa778f6ad0 -> 0x55aa778f6868]: [<-.data.frame [<-
tracemem[0x55aa778f6868 -> 0x55aa778f5b48]:
Hello,
I would like for my C function to be able to manipulate some values stored in
an R data frame.
To achieve this, a need the (real) memory address where the R data frame stores
its data (hopefully in a contiguous way). Then, from R, I call the C function
and passing this memory address as
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