Re: [Rd] Recent changes to as.complex(NA_real_)

On 9/22/23 16:55, Hervé Pagès wrote: > The problem is that you have things that are **semantically** > different but look exactly the same: > > They look the same: > > > x > [1] NA > > y > [1] NA > > z > [1] NA > > > is.na(x) > [1] TRUE > > is.na(y) > [1] TRUE > > is.na(z) > [1] TRUE > > > str(x)

Re: [Rd] Recent changes to as.complex(NA_real_)

The problem is that you have things that are **semantically** different but look exactly the same: They look the same: > x [1] NA > y [1] NA > z [1] NA > is.na(x) [1] TRUE > is.na(y) [1] TRUE > is.na(z) [1] TRUE > str(x)  cplx NA > str(y)  num NA > str(z)  cplx NA but they are sem

Re: [Rd] Recent changes to as.complex(NA_real_)

Perhaps I shouldn't comment without having read the entire thread, but I will: I can envision situations where I might want, e.g., 2 from complex(r=2, i=NA_real_). Spencer Graves On 9/22/23 3:43 PM, Duncan Murdoch wrote: Since the result of is.na(x) is the same on each of those

Re: [Rd] [External] On PRINTNAME() encoding, EncodeChar(), and being painted into a corner

Thanks for looking into this! On Mon, 18 Sep 2023, Ivan Krylov wrote: Hello R-devel, I have originally learned about this from the following GitHub issue: . In short, in various places of the R source code, symbol names are accessed u

Re: [Rd] Recent changes to as.complex(NA_real_)

Since the result of is.na(x) is the same on each of those, I don't see a problem. As long as that is consistent, I don't see a problem. You shouldn't be using any other test for NA-ness. You should never be expecting identical() to treat different types as the same (e.g. identical(NA, NA_rea

Re: [Rd] Recent changes to as.complex(NA_real_)

We could also question the value of having an infinite number of NA representations in the complex space. For example all these complex values are displayed the same way (as NA), are considered NAs by is.na(), but are not identical or semantically equivalent (from an Re() or Im() point of view)

Re: [Rd] Recent changes to as.complex(NA_real_)

On 2023-09-22 6:38 am, Martin Maechler wrote: Mikael Jagan on Thu, 21 Sep 2023 00:47:39 -0400 writes: > Revisiting this thread from April: > https://stat.ethz.ch/pipermail/r-devel/2023-April/082545.html > where the decision (not yet backported) was made for >

Re: [Rd] Recent changes to as.complex(NA_real_)

> Mikael Jagan > on Thu, 21 Sep 2023 00:47:39 -0400 writes: > Revisiting this thread from April: > https://stat.ethz.ch/pipermail/r-devel/2023-April/082545.html > where the decision (not yet backported) was made for > as.complex(NA_real_) to give NA_complex_ ins