matvis.coordinates.phi_hat

matvis.coordinates.phi_hat(theta, phi)

Return the unit vector phi_hat in Cartesian coords for spherical angles.

Parameters:

• theta (array_like) – Colatitude angle(s), in radians.

• phi (array_like) – Longitude angle(s), in radians.

Returns:

vec – Cartesian components of phi_hat.

Return type:

ndarray, shape (3, …)