healpy.rotator.dir2vec¶
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healpy.rotator.
dir2vec
(theta, phi=None, lonlat=False)¶ Transform a direction theta,phi to a unit vector.
Parameters: - theta : float, scalar or array-like
The angle theta (scalar or shape (N,)) or both angles (scalar or shape (2, N)) if phi is not given.
- phi : float, scalar or array-like, optionnal
The angle phi (scalar or shape (N,)).
- lonlat : bool
If True, input angles are assumed to be longitude and latitude in degree, otherwise, they are co-latitude and longitude in radians.
Returns: - vec : array
The vector(s) corresponding to given angles, shape is (3,) or (3, N).
See also
vec2dir()
,pixelfunc.ang2vec()
,pixelfunc.vec2ang()