Fig 4.11

Surface plots reference: surface plots @ PlotsGallery.jl

using Plots
Plots.default(linewidth=2)

z1(x, y) = x^2 + 0.5y^2
z2(x, y) = (.2x^2-1)^2 + y^2
x1 = y1 = range(-1.0, 1.0, 41)
x2 = range(-2.75, 2.75, 41)
y2 = range(-0.75, 0.75, 41)
p1 = surface(x1, y1, z1, title="Single-well potential")
p2 = contourf(x1, y1, z1)
p3 = surface(x2, y2, z2, title="Double-well potential")
p4 = contourf(x2, y2, z2)

plot(p1, p2, p3, p4, size=(800, 600))

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This notebook was generated using Literate.jl.