return 90 - r
r = np.arange(0, 90, 0.01)
theta = 2 * np.pi * r / 90
ax.plot(theta, mapr(r))
ax.set_yticks(list(range(0, 90, 10)))
ax.set_yticklabels(map(str, list(range(90, 0, -10))))
Set radial axis on Matplotlib polar plots