From: <tomas@tuxteam.de>
To: help-gnu-emacs@gnu.org
Subject: Re: (- 2.8 1.6) ; 1.1999999999999997
Date: Mon, 10 Feb 2020 22:31:14 +0100 [thread overview]
Message-ID: <20200210213114.GA25704@tuxteam.de> (raw)
In-Reply-To: <8736biywcn.fsf@ebih.ebihd>
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On Mon, Feb 10, 2020 at 10:18:48PM +0100, Emanuel Berg via Users list for the GNU Emacs text editor wrote:
> What's this?
>
> (- 2.8 1.6) ; 1.1999999999999997
>
> With the TI-84 Plus,
>
> 2.8-1.6=1.2
>
> Normally I'm all pro-Lisp but here...
Those numbers aren't exactly representable as binary fractions
(2.8 = 14/5, 1.6 = 8/5). So things like this happen. It's not
Lisp, but an artifact of the underlying representation (as
binary "floats" with limited precision).
Cheers
-- tomás
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next prev parent reply other threads:[~2020-02-10 21:31 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-10 21:18 (- 2.8 1.6) ; 1.1999999999999997 Emanuel Berg via Users list for the GNU Emacs text editor
2020-02-10 21:31 ` tomas [this message]
2020-02-10 21:33 ` Joost Kremers
2020-02-10 23:10 ` Emanuel Berg via Users list for the GNU Emacs text editor
2020-02-11 1:31 ` Stefan Monnier
2020-02-11 1:50 ` Alexandre François Garreau
2020-02-11 1:55 ` Emanuel Berg via Users list for the GNU Emacs text editor
2020-04-07 14:00 ` Bruno Félix Rezende Ribeiro
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