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Message-ID: <20240311083839.GG1884416@port70.net>
Date: Mon, 11 Mar 2024 09:38:39 +0100
From: Szabolcs Nagy <nsz@...t70.net>
To: Rich Felker <dalias@...c.org>
Cc: musl@...ts.openwall.com
Subject: Re: [PATCH] complex: fix comment in cacosh
* Rich Felker <dalias@...c.org> [2024-03-10 17:19:06 -0400]:
> On Sun, Mar 10, 2024 at 09:00:40PM +0100, Szabolcs Nagy wrote:
> > The principal experssions defining acosh and acos are such that
> >
> > acosh(z) = +-i acos(z)
> >
> > where the + is only true on the Im(z)>0 half of the complex plane
> > (and partly on Im(z)==0 depending on number representation).
> >
> > fix the comment without expanding on the details.
> > ---
> > src/complex/cacosh.c | 2 +-
> > 1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/src/complex/cacosh.c b/src/complex/cacosh.c
> > index 76127f75..586328ce 100644
> > --- a/src/complex/cacosh.c
> > +++ b/src/complex/cacosh.c
> > @@ -1,6 +1,6 @@
> > #include "complex_impl.h"
> >
> > -/* acosh(z) = i acos(z) */
> > +/* acosh(z) = +-i acos(z) */
> >
> > double complex cacosh(double complex z)
> > {
>
> I'm fine with taking this patch as-is, but it naturally raises a
> question: should it instead be:
>
> -/* acosh(z) = i acos(z) */
> +/* acosh(z) = ±i acos(z) */
>
> IOW, should we use non-ascii characters in comments like this? My
fine with me,
for me it's easier to type +- on the keyboard though.
> leaning would be yes, especially since it may be needed to properly
> attribute an algorithm or something where the only alternative is
> misspelling someone's name or leaving it out entirely.
>
> Really the only consideration for not doing this would be if it
> actively breaks compiling in some environments, but I don't think
> that's the case.
>
> Rich
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