From: Emanuel Berg <moasen@zoho.com>
To: help-gnu-emacs@gnu.org
Subject: 1.75 -> 1-3/4
Date: Tue, 05 Jun 2018 15:01:33 +0200 [thread overview]
Message-ID: <86lgbt4cb6.fsf@zoho.com> (raw)
Did anyone do the equivalent of this ("ths" zsh
below) in Elisp or any other Lisp? Just asking
before I do it myself. The algorithm should be
straightforward, but it uses recursion which
I plan to replace by a loop in the Elisp
version. But it looks good otherwise, right?
Before anyone tries to use it on a bicycle
tire, note that "[a] 26x1.5 tire and a 26x1-1/2
tire are different tire sizing systems" (JL on
rec.bicycles.tech). Read more here [1]
ths () {
local value=$1
local denom=${2:-16}
local whole=$(( int(floor($value)) ))
local rest=$(( $value - $whole ))
local frac=$(( int(rint($rest * $denom)) ))
if (( $frac > 0 && $(( $frac % 2 )) == 0 )); then
local new_denom=$(( denom / 2 ))
ths $value $new_denom
else
local frace
(( $frac > 0 )) && frace=-${frac}/${denom}
echo ${whole}${frace}
fi
}
# $ ths 2.0
# 2
# $ ths 1.75
# 1-3/4
[1] http://www.sheldonbrown.com/tire-sizing.html
--
underground experts united
http://user.it.uu.se/~embe8573
next reply other threads:[~2018-06-05 13:01 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-06-05 13:01 Emanuel Berg [this message]
2018-06-05 13:18 ` 1.75 -> 1-3/4 Teemu Likonen
2018-06-05 13:39 ` tomas
2018-06-05 13:49 ` tomas
2018-06-05 14:12 ` Teemu Likonen
[not found] ` <mailman.1205.1528205966.1292.help-gnu-emacs@gnu.org>
2018-06-05 15:30 ` Emanuel Berg
2018-06-05 17:00 ` tomas
[not found] ` <mailman.1245.1528218012.1292.help-gnu-emacs@gnu.org>
2018-06-05 18:08 ` Emanuel Berg
2018-06-05 15:25 ` Marko Vojinovic
[not found] ` <mailman.1238.1528215089.1292.help-gnu-emacs@gnu.org>
2018-06-05 18:06 ` Emanuel Berg
[not found] ` <mailman.1199.1528204714.1292.help-gnu-emacs@gnu.org>
2018-06-05 18:54 ` Emanuel Berg
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