2014-06-26 16:48:13 +00:00
|
|
|
|
---
|
|
|
|
|
|
layout: post
|
|
|
|
|
|
title: "Rounding numbers to N decimals in Emacs"
|
2016-02-26 15:19:42 +00:00
|
|
|
|
date: 2014-10-07T10:28:50Z
|
2014-06-26 16:48:13 +00:00
|
|
|
|
tags: [emacs, development]
|
|
|
|
|
|
permalink: /blog/2014/10/7/rounding-numbers-to-n-decimals-in-emacs
|
|
|
|
|
|
published: true
|
|
|
|
|
|
author:
|
|
|
|
|
|
name: Gergely Polonkai
|
|
|
|
|
|
email: gergely@polonkai.eu
|
|
|
|
|
|
---
|
|
|
|
|
|
|
|
|
|
|
|
I have recently faced a problem, where I had a bunch of SVG files with a
|
|
|
|
|
|
large amount of fraction numbers in the path definitions. These images were
|
|
|
|
|
|
displayed in small size, so this amount of precision was irrelevant, and
|
|
|
|
|
|
these numbers took almost half of my SVG images’ size. So I created an
|
|
|
|
|
|
Elisp defun to round these numbers to 2 decimals:
|
|
|
|
|
|
|
2015-04-27 09:00:04 +00:00
|
|
|
|
{% gist gergelypolonkai/9c721ceda6d3079b4f05 %}
|
2014-06-26 16:48:13 +00:00
|
|
|
|
|
|
|
|
|
|
This finds the first digit of the number under point (the cursor), and
|
|
|
|
|
|
reduces its digits to the given amount (or the number given with `C-u`). It
|
|
|
|
|
|
has some drawbacks, though, as it cannot handle exponential forms (e.g.
|
|
|
|
|
|
`1e-1234`), but these were rare in my case, and its hard to iterate through
|
|
|
|
|
|
all numbers. I will come over this latter problem soon(ish).
|
