From: "Clément Pit--Claudel" <clement.pitclaudel@live.com>
To: Eli Zaretskii <eliz@gnu.org>
Cc: 25557@debbugs.gnu.org
Subject: bug#25557: Documentation of format doesn't describe "g" accurately
Date: Sat, 28 Jan 2017 11:18:44 -0500 [thread overview]
Message-ID: <2763023c-ff54-ea65-c1b0-0c22e948f48a@live.com> (raw)
In-Reply-To: <837f5fyy09.fsf@gnu.org>
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On 2017-01-28 11:01, Eli Zaretskii wrote:
>> Cc: 25557@debbugs.gnu.org
>> From: Clément Pit--Claudel <clement.pitclaudel@live.com>
>> Date: Sat, 28 Jan 2017 10:45:09 -0500
>>
>>>> I'd like something like this (with a hypothetical %q):
>>>>
>>>> (format "%.3q" 3) ⇒ "3"
>>>> (format "%.3q" 3.00) ⇒ "3"
>>>> (format "%.3q" 3.30) ⇒ "3.3"
>>>> (format "%.3q" 3.05) ⇒ "3.05"
>>>> (format "%.3q" 3.352) ⇒ "3.35"
>>>> (format "%.3q" 3100000) ⇒ "3100000"
>>>>
>>>> This is in fact just the same as 'g', except for the last entry (%g produces "3.1e+06"). Is this achievable?
>>>
>>> Yes, if you use "%.7g". In general, use "%.Ng" if you want up to N
>>> digits in the printed representation.
>>>
>>> Does that answer your question?
>>
>> Almost: though this works for the last example, it breaks the one before the last (I'm looking for a format specifier that would constrain the number of decimals, not the number of digits, so that (format "%.3q" 30.352) would produce "30.35" — maybe all these examples should have had %.2q instead of %.3q, in fact).
>
> Then maybe you want %.2f?
No, that always prints decimals.
> If not, then perhaps you should explain what are you trying to
> accomplish? Why is it important to see 3.35 when the value is 3.352,
> but see all the trailing zeros for 3100000? It sounds like a
> contradiction to me.
I'm trying to get the shortest representation of a decimal number, rounded to .01, not using scientific/exponential notation. I'm using values computed in ELisp to produce CSS style sheets, which until recently didn't allow for exponential notation. I'd like these stylesheets to be readable, so 100% is better 100.00%, and 3.35em is better than 3.35004em. If my code is fed a value of 5000px, I don't want it converted to 5e+3px, because many browsers don't know how to parse that.
Thanks!
Clément.
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next prev parent reply other threads:[~2017-01-28 16:18 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-01-27 22:05 bug#25557: Documentation of format doesn't describe "g" accurately Clément Pit--Claudel
2017-01-28 8:37 ` Eli Zaretskii
2017-01-28 15:04 ` Clément Pit--Claudel
2017-01-28 15:23 ` Eli Zaretskii
2017-01-28 15:45 ` Clément Pit--Claudel
2017-01-28 16:01 ` Eli Zaretskii
2017-01-28 16:18 ` Clément Pit--Claudel [this message]
2017-01-28 16:25 ` Eli Zaretskii
2017-01-28 19:14 ` Clément Pit--Claudel
2017-01-28 19:31 ` Eli Zaretskii
2017-01-28 20:06 ` Clément Pit--Claudel
2017-01-28 20:29 ` Eli Zaretskii
2017-01-28 20:45 ` Clément Pit--Claudel
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