From: Emanuel Berg <moasenwood@zoho.eu>
To: help-gnu-emacs@gnu.org
Subject: Re: bike shifting - output decimal in percent
Date: Sun, 19 May 2019 09:35:33 +0200 [thread overview]
Message-ID: <867eamsxq2.fsf@zoho.eu> (raw)
In-Reply-To: 86blzysz4e.fsf@zoho.eu
>> (format "%2.2g%%" (* 100.0 foo)) => "31%"
>
> Great, thanks a lot :)
Oups, spoke (no pun intended :)) too soon.
Too much respect for Drew, I suppose ;)
But to be honest, the original program is
_much_ better. Check out the examples below:
;; secret bonus program :)
;; 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%"
;; (percent-string 0.01) ; "1%"
;; (percent-string 0.1) ; "10%"
;; (percent-string 1) ; "100%
;; (percent-string 2) ; "200%"
;; (format "%2.2g%%" (* 100.0 0.01)) ; " 1%" (?)
;; (format "%2.2g%%" (* 100.0 0.1)) ; "10%"
;; (format "%2.2g%%" (* 100.0 1)) ; "1e+02%" (!?)
;; (format "%2.2g%%" (* 100.0 2)) ; "2e+02%" (...)
File: https://dataswamp.org/~incal/emacs-init/bike.el
--
underground experts united
http://user.it.uu.se/~embe8573
https://dataswamp.org/~incal
next prev parent reply other threads:[~2019-05-19 7:35 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-05-19 1:34 bike shifting - output decimal in percent Emanuel Berg
2019-05-19 3:50 ` 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 [this message]
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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