num2str is a tiny Python library to convert a floating number into some specific mathematical expressions. The algorithm, which can be used in numerical calculation tools, is simple and efficient.
The following example shows how to use this library:
>>> from math import *
>>> from num2str import num2str
>>> num2str(3 / 5)
'3/5'
>>> num2str(pi / 2)
'π/2'
>>> num2str(-2 * sqrt(3))
'-2sqrt(3)'
>>> num2str(sqrt(2) + sqrt(3))
'sqrt(2)+sqrt(3)'It supports the following formats:
$\frac{a}{b}$ $\frac{\sqrt{a}}{b}$ $\frac{\sqrt{a}+\sqrt{b}}{c}$ $\text{some value}\times\pi$
We use a new algorithm to calculate the (3) format, You can find more information about the algorithm in this blog.
We have also rewritten all the Python code using C (in progress). You can copy num2str.c and num2str.h into your own project.