$\begingroup$Similar to this and this I'm trying to recover the original 2D field after the arctan2 operation.
Here's a MWE in python:
import numpy as np theta = np.random.uniform(low=-3*np.pi, high=3*np.pi, size=400) theta = theta.reshape(20,20) y = np.sin(theta) x = np.cos(theta) phi = np.arctan2(y, x) # theta = f(phi)? how to find f? Thanks.
