Track the beginnings of a script to plot in 3D.

scripts/plot_cubic.py

@@ -0,0 +1,11 @@
+#!/usr/bin/env python3
+
+import numpy as np
+import matplotlib.pyplot as plt
+
+def cost(x, y):
+    return 2*x**2 + 2*y**2 + 1
+
+fig = plt.figure()
+ax = plt.axes(projection='3d')
+