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Re: 1.75 -> 1-3/4
From: |
tomas |
Subject: |
Re: 1.75 -> 1-3/4 |
Date: |
Tue, 5 Jun 2018 15:39:10 +0200 |
User-agent: |
Mutt/1.5.21 (2010-09-15) |
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On Tue, Jun 05, 2018 at 04:18:23PM +0300, Teemu Likonen wrote:
> Emanuel Berg [2018-06-05 15:01:33+02] wrote:
>
> > Did anyone do the equivalent of this ("ths" zsh below) in Elisp or any
> > other Lisp?
>
> Common Lisp has RATIONAL and RATIONALIZE functions which convert real
> numbers to rational numbers. See the specification:
>
> http://www.lispworks.com/documentation/HyperSpec/Body/f_ration.htm
>
> "Decimals" library for Common Lisp can parse a decimal number string and
> convert it to a rational number. See function PARSE-DECIMAL-NUMBER:
>
> https://github.com/tlikonen/cl-decimals
GNU Guile can do this too:
scheme@(guile-user)> (inexact->exact 1.3333)
$7 = 3002324691586541/2251799813685248
(yikes ;-) but...
scheme@(guile-user)> (rationalize (inexact->exact 1.3333) 1/1000)
$10 = 4/3
(ah, better). Note that the second argument to rationalize *has* to
be a fraction, otherwise the result will be inexact (i.e. a float).
As to Emacs lisp... natively not. But there seems to be a package [1],
and good ol' calc can deal with rationals too.
Now if we had Guile Emacs (I know, I know).
Cheers
[1] https://www.emacswiki.org/emacs/RationalNumber
- -- tomás
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Re: 1.75 -> 1-3/4, Marko Vojinovic, 2018/06/05
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