Set the minimum and maximum theta values.

Can take the following signatures:

• set_thetalim(minval, maxval): Set the limits in radians.

• set_thetalim(thetamin=minval, thetamax=maxval): Set the limits in degrees.

where minval and maxval are the minimum and maximum limits. Values are wrapped in to the range \([0, 2\pi]\) (in radians), so for example it is possible to do set_thetalim(-np.pi / 2, np.pi / 2) to have an axis symmetric around 0. A ValueError is raised if the absolute angle difference is larger than a full circle.