2014-06-26 16:48:13 +00:00
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---
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layout: post
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title: "Rounding numbers to N decimals in Emacs"
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2016-02-26 15:26:26 +00:00
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date: 2014-10-07 10:28:50
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2014-06-26 16:48:13 +00:00
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tags: [emacs, development]
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permalink: /blog/2014/10/7/rounding-numbers-to-n-decimals-in-emacs
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published: true
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author:
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name: Gergely Polonkai
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email: gergely@polonkai.eu
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---
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I have recently faced a problem, where I had a bunch of SVG files with a
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large amount of fraction numbers in the path definitions. These images were
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displayed in small size, so this amount of precision was irrelevant, and
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these numbers took almost half of my SVG images’ size. So I created an
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Elisp defun to round these numbers to 2 decimals:
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2017-08-31 09:55:54 +00:00
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{% gist 9c721ceda6d3079b4f05 %}
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2014-06-26 16:48:13 +00:00
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This finds the first digit of the number under point (the cursor), and
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reduces its digits to the given amount (or the number given with `C-u`). It
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has some drawbacks, though, as it cannot handle exponential forms (e.g.
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`1e-1234`), but these were rare in my case, and its hard to iterate through
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all numbers. I will come over this latter problem soon(ish).
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