GNU bug report logs - #25652
26.0.50; [calc] In Units Simplication + Degree mode cos(1 deg) != cos(1)

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Package: emacs;

Reported by: Torsten Bronger <bronger <at> physik.rwth-aachen.de>

Date: Wed, 8 Feb 2017 07:39:02 UTC

Severity: normal

Tags: confirmed

Found in version 26.0.50

Done: Tino Calancha <tino.calancha <at> gmail.com>

Bug is archived. No further changes may be made.

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From: Torsten Bronger <bronger <at> physik.rwth-aachen.de>
To: 25652 <at> debbugs.gnu.org
Subject: bug#25652: 26.0.50; calc says that cos(1 degree) is 0.54
Date: Sat, 11 Feb 2017 11:16:20 +0100

Hallöchen!

Torsten Bronger writes:

> [...]
>
> You can toggle this in calc mode with "m U".  So "m d m U 1 C m U
> 1 C" should exhibit the problem.  Note that you have "Deg" active
> the whole time.  [...]

After havin updated to current git master, I can now reproduce this
on both of my machine.  Can you confirm?

> [...]
>
> And, "90 C" always yielding zero is definitely inconsistent.
> "89.999 C" yields -0.447984214223 while in unit simplification mode,
> so the cosine is not continuous anymore.

As I can reproduce this.

Tschö,
Torsten.

-- 
Torsten Bronger
This bug report was last modified 8 years and 64 days ago.

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