Draw axis lines or the origin for Matplotlib contour plot
There are a number of options (E.g. centered spines), but in your case, it's probably simplest to just use axhline and axvline.
E.g.
import numpy as npimport matplotlib.pyplot as pltxvec = np.linspace(-5.,5.,100) x,y = np.meshgrid(xvec, xvec)z = -np.hypot(x, y) plt.contourf(x, y, z, 100) plt.colorbar() plt.axhline(0, color='white')plt.axvline(0, color='white')plt.show()