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Re: Converting an Integer into Human Readable String
From: |
Eli Zaretskii |
Subject: |
Re: Converting an Integer into Human Readable String |
Date: |
Sat, 09 Apr 2011 11:46:34 +0300 |
> From: "Pascal J. Bourguignon" <pjb@informatimago.com>
> Date: Fri, 08 Apr 2011 13:41:30 +0200
>
> Instead, you could have had some fun, and implement yourself the
> required function. Well, now you've got only what you merit, here I
> had all the fun, you can have the function:
>
> (format-human-readable-big-number 123456789012
> *normal-format*
> *exceptional-format*
> "B" t :binary)
> --> " 114.978 GiB"
That's very impressive, but at closer look, I found the following
problems with this implementation:
. It cannot be evaluated in Emacs Lisp without commenting out the
part between "#|" and "|#".
. It cannot be evaluated on a 32-bit machine without commenting out
some parts of the integer test values in the test harness, due to
integer overflows.
. When the last argument is :binary, it produces wrong results for
numbers between 1000*2^N and 1023*2^N. E.g.,
(format-human-readable-big-number 1023 "%.1f" "%13.3e" "B" t :binary)
=> " 1.023e+003 B"
whereas I'd expect "1023 B" instead.
. It always produces results with a fixed number of digits after the
decimal, determined by the value of *normal-format*. Thus, with a
format of "%.1f" it will always produce 1 digit after the decimal,
even if that digit is zero:
(format-human-readable-big-number 900 "%.1f" "%13.3e" "B" t :binary)
=> "900.0 B"
which is IMO ugly; "ls -lh" produces just "900" in this case. This
cannot be remedied by using "%.0f" as the normal format, because
then it will always round to the nearest integral value, and the
fractions will never be shown; again, this is different from "ls -lh".
- Re: Converting an Integer into Human Readable String, (continued)
- Re: Converting an Integer into Human Readable String, Eli Zaretskii, 2011/04/07
- Re: Converting an Integer into Human Readable String, Thierry Volpiatto, 2011/04/07
- Message not available
- Message not available
- Re: Converting an Integer into Human Readable String, Thierry Volpiatto, 2011/04/08
- Re: Converting an Integer into Human Readable String, Eli Zaretskii, 2011/04/08
- Re: Converting an Integer into Human Readable String, Thierry Volpiatto, 2011/04/08
Re: Converting an Integer into Human Readable String, Pascal J. Bourguignon, 2011/04/08
Re: Converting an Integer into Human Readable String,
Eli Zaretskii <=
Message not available