From: "Clément Pit--Claudel" <clement.pitclaudel@live.com>
To: 25557@debbugs.gnu.org
Subject: bug#25557: Documentation of format doesn't describe "g" accurately
Date: Fri, 27 Jan 2017 17:05:28 -0500 [thread overview]
Message-ID: <78ace0d5-59f1-0d7d-1f0e-b589a947d76c@live.com> (raw)
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Hi emacs,
There seems to be a few issues in the docstring of `format':
> %g means print a number in exponential notation
> or decimal-point notation, whichever uses fewer characters.
This seems wrong:
(format "%g" 3.0) ⇒ "3", but
(format "%f" 3.0) ⇒ "3.000000", and
(format "%e" 3.0) ⇒ "3.000000e+00", so %g is neither %f nor %e.
> The # flag means to use an alternate display form [...]
> for %e, %f, and %g, it causes a decimal point to be included even if
> the precision is zero.
This seems incomplete:
(format "%#.5g" 3) ⇒ "3.0000", while
(format "%.5g" 3) ⇒ "3", so # doesn't just cause changes when the precision is 0.
> For %e, %f, and %g sequences, the number after the "." in the
> precision specifier says how many decimal places to show
This seems wrong, too:
(format "%.5g" 3.0) ⇒ "3", not "3.00000"
(format "%.5g" 3.1) ⇒ "3.1", not "3.10000"
Similar problems seem to exist in the actual documentation. On a related note, is there a way to get a shortest representation of a number? Something like %g, but without exponents.
Thanks!
Clément.
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next reply other threads:[~2017-01-27 22:05 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-01-27 22:05 Clément Pit--Claudel [this message]
2017-01-28 8:37 ` bug#25557: Documentation of format doesn't describe "g" accurately 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
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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