healpy.rotator.dir2vec¶

healpy.rotator.dir2vec(theta, phi=None, lonlat=False)¶

Transform a direction theta,phi to a unit vector.

Parameters

thetafloat, scalar or array-like: The angle theta (scalar or shape (N,)) or both angles (scalar or shape (2, N)) if phi is not given.
phifloat, scalar or array-like, optionnal: The angle phi (scalar or shape (N,)).
lonlatbool: If True, input angles are assumed to be longitude and latitude in degree, otherwise, they are co-latitude and longitude in radians.

Returns

vecarray: The vector(s) corresponding to given angles, shape is (3,) or (3, N).