Re: Issue in man page clog.3

Re: Issue in man page clog.3

[Alejandro Colomar]

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On Wed, Nov 01, 2023 at 03:25:46PM +0000, Helge Kreutzmann wrote:
> Hello Alejandro,
> Am Wed, Nov 01, 2023 at 04:00:16PM +0100 schrieb Alejandro Colomar:
> > On Wed, Nov 01, 2023 at 02:02:10PM +0000, Helge Kreutzmann wrote:
> > > Without further ado, the following was found:
> > > 
> > > Issue:    [-pi,pi] means both -pi and pi are included, this does not make sense, either one must be out of the interval?
> > > 
> > > "The logarithm B<clog>()  is the inverse function of the exponential "
> > > "B<cexp>(3).  Thus, if I<y\\ =\\ clog(z)>, then I<z\\ =\\ cexp(y)>.  The "
> > > "imaginary part of I<y> is chosen in the interval [-pi,pi]."
> > 
> > I don't know this function.  Please suggest a fix, and CC glibc so that
> > they can review the change.
> 
> From a mathematical point of view either -pi or pi needs to be
> excluded. I'm not a programmer, so the I cannot tell which is the case
> here.
> 
> So you need to contact the person who wrote or who maintains this
> function / man page.

Hi,

I'm CCing glibc, in case they want to say something.

Cheers,
Alex

-- 
<https://www.alejandro-colomar.es/>

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Re: Issue in man page clog.3

[Nikolaos Chatzikonstantinou]

It just says that the value is in that interval, so it is not wrong.
There is no canonical way to cut the plane into strips, either the top
is half-open or the bottom.

On Wed, Nov 1, 2023 at 1:08 PM Alejandro Colomar via Libc-help
<libc-help@sourceware.org> wrote:
>
> On Wed, Nov 01, 2023 at 03:25:46PM +0000, Helge Kreutzmann wrote:
> > Hello Alejandro,
> > Am Wed, Nov 01, 2023 at 04:00:16PM +0100 schrieb Alejandro Colomar:
> > > On Wed, Nov 01, 2023 at 02:02:10PM +0000, Helge Kreutzmann wrote:
> > > > Without further ado, the following was found:
> > > >
> > > > Issue:    [-pi,pi] means both -pi and pi are included, this does not make sense, either one must be out of the interval?
> > > >
> > > > "The logarithm B<clog>()  is the inverse function of the exponential "
> > > > "B<cexp>(3).  Thus, if I<y\\ =\\ clog(z)>, then I<z\\ =\\ cexp(y)>.  The "
> > > > "imaginary part of I<y> is chosen in the interval [-pi,pi]."
> > >
> > > I don't know this function.  Please suggest a fix, and CC glibc so that
> > > they can review the change.
> >
> > From a mathematical point of view either -pi or pi needs to be
> > excluded. I'm not a programmer, so the I cannot tell which is the case
> > here.
> >
> > So you need to contact the person who wrote or who maintains this
> > function / man page.
>
> Hi,
>
> I'm CCing glibc, in case they want to say something.
>
> Cheers,
> Alex
>
> --
> <https://www.alejandro-colomar.es/>