gergelypolonkai-web-jekyll/_posts/2014-10-07-rounding-numbers-to-n-decimals-in-emacs.markdown

layout	title	date	tags	permalink	published	author
post	Rounding numbers to N decimals in Emacs	2014-10-07 10:28:50	emacs development	/blog/2014/10/7/rounding-numbers-to-n-decimals-in-emacs	true	name email Gergely Polonkai 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:

{% gist 9c721ceda6d3079b4f05 %}

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).