It seems to me that the documentation of R's complex class & R's atan function
do not tell us what to expect, so (as others have suggested), some additional
notes are needed. I think that mathematically atan(1i) should be NA_complex_,
but R seems not to use any mathematically standard compactifi
G.5.1 para 2 can be found in the C17 standard -- I actually have the
final draft not the published standard. It's in earlier standards, I
just didn't check earlier standards. Complex arithmetic was not in
the first C standard (C89) but was in C99.
The complex numbers do indeed form a field, and
Need to kill some time, so thought I'd Opine.
Given the intent, as I understood it... to extract components from a quantile
regression (rq) object similar to how one might extract effects from an lm
object.
Since it seems effects() is not implemented for rq, here are some alternative
approach
> Duncan Murdoch
> on Fri, 6 Sep 2024 05:54:23 -0400 writes:
> On 2024-09-06 12:44 a.m., Richard O'Keefe wrote:
>> I expect that atan(1i) = (0 + infinity i) and that atan(1i)/5 = (0 +
>> infinity i)/5 = (0 + infinity i).
>> Here's what I get in C:
>> (0,1) = (0, 1)
On 2024-09-06 12:44 a.m., Richard O'Keefe wrote:
I expect that atan(1i) = (0 + infinity i) and that atan(1i)/5 = (0 +
infinity i)/5 = (0 + infinity i).
Here's what I get in C:
(0,1) = (0, 1)
atan((0,1)) = (0, inf)
atan((0,1))/5 = (0, inf)
Note the difference between I*infinity = (0,1)*infinity =
> On 5 Sep 2024, at 16:36 , Gabor Grothendieck wrote:
>
> sigma(model)^2 will give the correct MSE. Also note that your model
> matrix has intercept at
> the end whereas vcov will have it at the beginning so you will need to
> permute the rows
> and columns to get them to be the same/
Also,
Apologies, forgot to copy R-help on this response.
Begin forwarded message:
From: Roger Koenker
Subject: Re: [R] effects() extractor for a quantile reqression object: error
message
Date: September 6, 2024 at 8:38:47 AM GMT+1
To: "Christopher W. Ryan"
Chris,
This was intended to emulate the
> Richard O'Keefe
> on Fri, 6 Sep 2024 17:24:07 +1200 writes:
> The thing is that real*complex, complex*real, and complex/real are not
> "complex arithmetic" in the requisite sense.
> The complex numbers are a vector space over the reals,
Yes, but they _also_ are field
> Christopher W Ryan via R-help
> on Thu, 5 Sep 2024 22:50:24 -0400 writes:
> I'm using quantreg package version 5.98 of 24 May 2024, in R 4.4.1 on
> Linux Mint.
> The online documentation for quantreg says, in part, under the
> description of the rq.object, "The coef
9 matches
Mail list logo
