GNU bug report logs - #19582
25.0.50; [PATCH] Calc: glitches with negation of units

Previous Next

Package: emacs;

Reported by: Wolfgang Jenkner <wjenkner <at> inode.at>

Date: Tue, 13 Jan 2015 14:31:02 UTC

Severity: normal

Tags: fixed, patch

Found in version 25.0.50

Done: Lars Ingebrigtsen <larsi <at> gnus.org>

Bug is archived. No further changes may be made.

Full log

View this message in rfc822 format

From: Wolfgang Jenkner <wjenkner <at> inode.at>
To: Jay Belanger <jay.p.belanger <at> gmail.com>
Cc: 19582 <at> debbugs.gnu.org
Subject: bug#19582: 25.0.50; [PATCH] Calc: glitches with negation of units
Date: Tue, 13 Jan 2015 17:25:23 +0100

On Tue, Jan 13 2015, Jay Belanger wrote:

> Since 100 and (float 1 2) aren't the same, that might be a bug of some
> kind.

Sure, but

(math-equal 100 '(float 1 2)) => t

and (info "(calc) Predicates") states

 -- Function: math-equal x y
     Returns true if X and Y are numerically equal, either because they
     are `equal', or because their difference is `zerop'. [...]

so, IIUC, mathematically, they are as equal as it gets in calc.

On the other hand, I'm not sure if calculations with (float ...)
are exact (if possible) in calc ?
This bug report was last modified 9 years and 123 days ago.

Previous Next

GNU bug tracking system
Copyright (C) 1999 Darren O. Benham, 1997,2003 nCipher Corporation Ltd, 1994-97 Ian Jackson.