From: Emanuel Berg <moasenwood@zoho.eu>
To: help-gnu-emacs@gnu.org
Subject: bike shifting - output decimal in percent
Date: Sun, 19 May 2019 03:34:07 +0200 [thread overview]
Message-ID: <86mujjrzw0.fsf@zoho.eu> (raw)
How do I output a decimal float digit
0 <= x <= 1 into percent? ("A percentage?"
Correct English?)
I asked at #emacs@irc.freenode.net and got the
below answer, which, as you see, works fine.
But I wonder if/why-not there is/isn't
a built-in way to do it?
Context:
;; thanks to friend at #emacs
(defun percent-string (decimal)
(concat
(number-to-string
(round (* 100 decimal)) ) "%") )
;; test: (percent-string 0.42857142857142855) ; "43%"
(defun bike-compute-step (from to)
(percent-string
(/ (- from to)
from
1.0) ))
;; test - should be 43% for
;; one 42t and one 24t chainring
;; according to an article in the spring 2019 issue
;; of "Bicycle Quarterly" (ISSN 1941-8809) -
;; (bike-compute-step 42 24) ; "43%"
Whole file:
http://user.it.uu.se/~embe8573/emacs-init/bike.el
--
underground experts united
http://user.it.uu.se/~embe8573
https://dataswamp.org/~incal
next reply other threads:[~2019-05-19 1:34 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-05-19 1:34 Emanuel Berg [this message]
2019-05-19 3:50 ` bike shifting - output decimal in percent Drew Adams
2019-05-19 3:57 ` Drew Adams
2019-05-19 4:09 ` Drew Adams
2019-05-19 7:05 ` Emanuel Berg
2019-05-19 7:35 ` Emanuel Berg
2019-05-19 7:53 ` Tomas Nordin
2019-05-19 8:02 ` Emanuel Berg
2019-05-19 8:15 ` Tomas Nordin
2019-05-19 8:26 ` Emanuel Berg
2019-05-19 14:26 ` Drew Adams
2019-05-19 14:15 ` Drew Adams
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