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

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Tino Calancha <tino.calancha <at> gmail.com>
Cc: tracker <at> debbugs.gnu.org
Subject: bug#25652: closed (26.0.50; [calc] In Units Simplication + Degree
 mode cos(1 deg) != cos(1))
Date: Thu, 18 May 2017 05:52:01 +0000

[Message part 1 (text/plain, inline)]

Your message dated Thu, 18 May 2017 14:51:46 +0900
with message-id <878tlu3e6l.fsf <at> calancha-pc>
and subject line Re: bug#25652: 26.0.50; calc says that cos(1 degree) is 0.54
has caused the debbugs.gnu.org bug report #25652,
regarding 26.0.50; [calc] In Units Simplication + Degree mode cos(1 deg) != cos(1)
to be marked as done.

(If you believe you have received this mail in error, please contact
help-debbugs <at> gnu.org.)


-- 
25652: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=25652
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

[Message part 2 (message/rfc822, inline)]

From: Torsten Bronger <bronger <at> physik.rwth-aachen.de>
To: <bug-gnu-emacs <at> gnu.org>
Subject: 26.0.50; calc says that cos(1 degree) is 0.54
Date: Wed, 8 Feb 2017 08:37:57 +0100

In Emacs calc usind degree mode, cos(1) results in 0.540302305868
instead of 0.999847695156.


In GNU Emacs 26.0.50.3 (x86_64-pc-linux-gnu)
 of 2017-02-08 built on wilson
Repository revision: c8ee570a8be7afaae3ea318b9d7dbffb62a7bbd0
Windowing system distributor 'The X.Org Foundation', version 11.0.11804000
System Description:	Ubuntu 16.04.1 LTS

Recent messages:
Mark set [2 times]
Saving file /home/bronger/src/totorio/certbot/certbot_master.py...
Wrote /home/bronger/src/totorio/certbot/certbot_master.py
C-c * is undefined
C-x *  (Type ? for a list of Calc options)
Loading /home/bronger/.calc.el (source)...done
Welcome to the GNU Emacs Calculator!  Press ‘?’ or ‘h’ for help, ‘q’ to quit
Working... [2 times]
Angles measured in radians
Working...

Configured using:
 'configure --prefix=/usr/local/ --mandir=/usr/local/share/man/
 --infodir=/usr/local/share/info/ --with-x-toolkit=no --without-makeinfo
 --with-xpm --with-jpeg --with-tiff --with-gif --with-png --with-x'

Configured features:
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FREETYPE XFT ZLIB X11

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Major mode: Calculator

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-- 
Torsten Bronger

[Message part 3 (message/rfc822, inline)]

From: Tino Calancha <tino.calancha <at> gmail.com>
To: 25652-done <at> debbugs.gnu.org
Subject: Re: bug#25652: 26.0.50; calc says that cos(1 degree) is 0.54
Date: Thu, 18 May 2017 14:51:46 +0900

npostavs <at> users.sourceforge.net writes:

> Tino Calancha <tino.calancha <at> gmail.com> writes:
>
>> Yes, my commit produced this bug.  We must revert it.  Sorry for that.
>> That commit was to fix Bug#23889.  It would be nice if we can fix Bug#23889 in
>> a new way.
>> In that bug the problem was that, if the user inputs a symbolic expression containning
>> an angle unit, then this unit is overriden by calc-angle-mode while simplifying such
>> expression.
>> That should not happen as mentioned in the manual:
>> (info "(calc) Trigonometric and Hyperbolic Functions")
>>
>> That is,
>> M-x calc RET
>> m d ; Set calc-angle-mode to degrees.
>> ' sin (45 deg) RET
>> u s ; Must insert the value of:  (sin (* 45 pi (/ 180.0)))
>> ;; But instead, inserts the value of: (sin (* 45 (expt (/ pi 180.0) 2)))
>> ;; i.e., it's applying (/ pi 180) twice.
>>
>> I have updated the patch:
>> 1) Revert 713e922243
>>
>> 2) Bind calc-angle-mode to 'rad while simplifying an expression whenever such
>> expression contains an unit angle.  This way, hopefully, the second factor (/ pi 180)
>> won't be applied.
>>
>> Opinions, comments...
>
> I'm not familiar enough with calc to say if this is a good idea or not,
> but I guess you may as well push this now so that we can discover if it
> has any problems sooner rather than later.

Thank you.  I've reverted my buggy fix, and pushed a new fix
for Bug#23889 into master:

Revert:
eab1a6307b09180bd775cfb6bf7330eb5367bbe0
Fix:
c48e539226a062d01b8d5534644fae959506a743

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