GNU bug report logs - #25255
Emacs calculator evalutes lcm to a negative number

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Package: emacs;

Reported by: Bug Poster <bugzilla-mail-box <at> yandex.ru>

Date: Fri, 23 Dec 2016 17:16:02 UTC

Severity: normal

Tags: patch

Fixed in version 26.1

Done: Glenn Morris <rgm <at> gnu.org>

Bug is archived. No further changes may be made.

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Report forwarded to bug-gnu-emacs <at> gnu.org:
bug#25255; Package emacs. (Fri, 23 Dec 2016 17:16:02 GMT) Full text and rfc822 format available.
Acknowledgement sent to Bug Poster <bugzilla-mail-box <at> yandex.ru>:
New bug report received and forwarded. Copy sent to bug-gnu-emacs <at> gnu.org. (Fri, 23 Dec 2016 17:16:02 GMT) Full text and rfc822 format available.

Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Bug Poster <bugzilla-mail-box <at> yandex.ru>
To: bug-gnu-emacs <at> gnu.org
Subject: Emacs calculator evalutes lcm to a negative number
Date: Fri, 23 Dec 2016 19:32:19 +0900

GNU Emacs 24.3.1


This is formula of Least Common Multiple:

lcm(a, b) = |a * b| / gcd(a, b)


The calculator evaluates it, but doesn't take its absolute value.


Input:

5
n
<RET>
4
k
l

Output:

1: -20
Information forwarded to bug-gnu-emacs <at> gnu.org:
bug#25255; Package emacs. (Sun, 05 Feb 2017 10:29:02 GMT) Full text and rfc822 format available.

Message #8 received at 25255 <at> debbugs.gnu.org (full text, mbox):

From: peder <at> klingenberg.no (Peder O. Klingenberg)
To: 25255 <at> debbugs.gnu.org
Subject: Re: bug#25255: Emacs calculator evalutes lcm to a negative number
Date: Sun, 05 Feb 2017 11:28:17 +0100

[Message part 1 (text/plain, inline)]
Bug Poster <bugzilla-mail-box <at> yandex.ru> writes:

> This is formula of Least Common Multiple:
>
> lcm(a, b) = |a * b| / gcd(a, b)

I agree, every textbook I can find defines lcm to return a positive
integer.  Here's a patch, which hopefully someone will apply.


[0001-LCM-is-defined-to-return-a-positive-integer.patch (text/x-patch, attachment)]
[Message part 3 (text/plain, inline)]
-- 
...Peder...
Added tag(s) patch. Request was from peder <at> klingenberg.no (Peder O. Klingenberg) to control <at> debbugs.gnu.org. (Sun, 05 Feb 2017 10:37:01 GMT) Full text and rfc822 format available.
Information forwarded to bug-gnu-emacs <at> gnu.org:
bug#25255; Package emacs. (Fri, 24 Feb 2017 01:32:02 GMT) Full text and rfc822 format available.

Message #13 received at 25255 <at> debbugs.gnu.org (full text, mbox):

From: Glenn Morris <rgm <at> gnu.org>
To: peder <at> klingenberg.no (Peder O. Klingenberg)
Cc: bugzilla-mail-box <at> yandex.ru, 25255 <at> debbugs.gnu.org
Subject: Re: bug#25255: Emacs calculator evalutes lcm to a negative number
Date: Thu, 23 Feb 2017 20:30:46 -0500

Peder O. Klingenberg wrote:

> I agree, every textbook I can find defines lcm to return a positive
> integer.  Here's a patch, which hopefully someone will apply.

Thanks; applied as f6d2ba7.
bug marked as fixed in version 26.1, send any further explanations to 25255 <at> debbugs.gnu.org and Bug Poster <bugzilla-mail-box <at> yandex.ru> Request was from Glenn Morris <rgm <at> gnu.org> to control <at> debbugs.gnu.org. (Fri, 24 Feb 2017 01:32:02 GMT) Full text and rfc822 format available.
bug archived. Request was from Debbugs Internal Request <help-debbugs <at> gnu.org> to internal_control <at> debbugs.gnu.org. (Fri, 24 Mar 2017 11:24:04 GMT) Full text and rfc822 format available.
This bug report was last modified 8 years and 90 days ago.

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