Calculate inverse of a function--Library [closed]

Question

Is there any library available to have inverse of a function? To be more specific, given a function y=f(x) and domain, is there any library which can output x=f(y)? Sadly I cannot use matlab/mathematics in my application, looking for C/Python library..

Answer 1

As has already been mentioned, not all functions are invertible. In some cases imposing additional constraints helps: think about the inverse of sin(x).

Once you are sure your function has a unique inverse, solve the equation f(x) = y. The solution gives you the inverse, y(x).

In python, look for nonlinear solvers from scipy.optimize.

Answer 2

I am a bit late, but for future readers of the post, I just published a python package that does this precisely. https://pypi.python.org/pypi/pynverse There is a detailed description of how to use it and how it does it in the description!