Draw axis lines or the origin for Matplotlib contour plot.

To draw axis lines or the origin for matplotlib contour plot, we can use contourf(), axhline() y=0 and axvline() x=0.

  • Create data points for x, y, and z using numpy.

  • To set the axes properties, we can use plt.axis('off') method.

  • Use contourf() method with x, y, and z data points.

  • Plot x=0 and y=0 lines with red color.

  • To display the figure, use show() method.


import numpy as np
import matplotlib.pyplot as plt
plt.rcParams["figure.figsize"] = [7.00, 3.50]
plt.rcParams["figure.autolayout"] = True
x = np.linspace(-1.0, 1.0, 10)
x, y = np.meshgrid(x, x)
z = -np.hypot(x, y)
plt.contourf(x, y, z, 10)
plt.axhline(0, color='red')
plt.axvline(0, color='red')