What is the procedure for creating surface plots in matplotlib when the function z = f(x,y) cannot be expressed in standard functions?

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If the function z = f(x,y) cannot be expressed in standard functions, the procedure for creating surface plots in matplotlib involves:

1. Generating a grid of points in the x-y plane using the numpy meshgrid function.
2. Evaluating the function at each point in the grid to obtain the corresponding z values.
3. Creating a 3D axes object using the mpl_toolkits.mplot3d package.
4. Plotting the surface using the plot_surface function, with the x, y, and z values generated in steps 1-2 as input.
5. Adding any desired labels, titles, and color maps to the plot.