From: David De La Harpe Golden <david@harpegolden.net>
To: Eli Zaretskii <eliz@gnu.org>
Cc: handa@m17n.org, emacs-devel@gnu.org
Subject: Re: numeri
Date: Sat, 29 Nov 2008 19:01:22 +0000 [thread overview]
Message-ID: <49319182.7070400@harpegolden.net> (raw)
In-Reply-To: <uhc5qfkcd.fsf@gnu.org>
Eli Zaretskii wrote:
>
> Actually, why not make the above return the number 4? The Unicode
> Data File Format says that this property's value is ``an integer or
> rational number''. We could even use 0.2 for characters such as
> "VULGAR FRACTION ONE FIFTH". Isn't that better than `1/5'?
>
>
Bear in mind that 1/5 (0.2) isn't actually exactly representable by
binary floating point, bit like the way 1/3 (0.333(3 recurring)) can't
be written properly in decimal, so try in emacs lisp:
(format "%.20f" 0.2)
I'd tend to hold off on allowing the vulgar fractions to map to numbers
without the programmer to do a conversion step and "own" the associated
potential information loss - at least until there is no loss: Emacs
Lisp could one day get CL-like exact rational numbers I guess (though
bignums would probably be a higher priority...)
next prev parent reply other threads:[~2008-11-29 19:01 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-11-29 14:36 numeri Eli Zaretskii
2008-11-29 16:04 ` numeri Andreas Schwab
2008-11-29 17:22 ` numeri Eli Zaretskii
2008-11-29 17:39 ` numeri Andreas Schwab
2008-11-29 18:05 ` numeri Eli Zaretskii
2008-11-29 18:38 ` numeri Eli Zaretskii
2008-11-29 19:01 ` David De La Harpe Golden [this message]
2008-11-29 21:26 ` numeri Eli Zaretskii
2008-11-29 22:50 ` numeri Stefan Monnier
2008-12-01 12:09 ` numeri Kenichi Handa
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