From: Lennart Borgman <lennart.borgman.073@student.lu.se>
Cc: Emacs-Devel <emacs-devel@gnu.org>,
Drew Adams <drew.adams@oracle.com>, "Kim F. Storm" <storm@cua.dk>
Subject: Re: Elisp manual, node "Comparison of Numbers"
Date: Mon, 29 May 2006 16:18:32 +0200 [thread overview]
Message-ID: <447B02B8.6070201@student.lu.se> (raw)
In-Reply-To: <85bqtgditu.fsf@lola.goethe.zz>
David Kastrup wrote:
>>>>>
>>>>>
>>>> The problem here is that fuzz is a _relative_ measure of equality, and
>>>> you employ it as an absolute measure here. I don't think it a good
>>>> idea at all that 1e-12 and 0.995e-12 are considered different, while
>>>> 1e-8 and 0.0 are considered equal.
>>>>
>>>>
>>> Agree!
>>>
>>>
>> Hm. It is the relative distance from 0.
>>
>
> It is merely the distance from 0, not the "relative distance".
>
Yes, in a sense you are right. I should have expressed my self a bit
differently, but I am afraid you missed the point. The crucial thing is
that you divide the difference with the "distance" from 0 to construct
the number you compare to the fuzz factor.
It seems reasonable to me but breaks down in the special case where one
of the numbers are 0 (and the other is not).
Or am I missing something?
next prev parent reply other threads:[~2006-05-29 14:18 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-05-29 13:20 Elisp manual, node "Comparison of Numbers" Drew Adams
2006-05-29 13:33 ` David Kastrup
2006-05-29 13:42 ` Kim F. Storm
2006-05-29 13:54 ` Lennart Borgman
2006-05-29 14:08 ` David Kastrup
2006-05-29 14:18 ` Lennart Borgman [this message]
2006-05-29 14:23 ` David Kastrup
2006-05-29 14:40 ` Lennart Borgman
2006-05-29 21:28 ` Richard Stallman
2006-05-29 13:40 ` Lennart Borgman
2006-05-29 18:14 ` Drew Adams
2006-05-30 3:46 ` Richard Stallman
2006-05-29 19:23 ` Stefan Monnier
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