UnitSphericalDifferential¶
- class astropy.coordinates.UnitSphericalDifferential(d_lon, d_lat=None, copy=True)[source]¶
Bases:
BaseSphericalDifferential
Differential(s) of points on a unit sphere.
- Parameters:
Attributes Summary
Component 'd_lat' of the Differential.
Component 'd_lon' of the Differential.
Methods Summary
from_cartesian
(other, base)Convert the differential from 3D rectangular cartesian coordinates to the desired class.
from_representation
(representation[, base])Create a new instance of this representation from another one.
represent_as
(other_class[, base])Convert coordinates to another representation.
to_cartesian
(base)Convert the differential to 3D rectangular cartesian coordinates.
transform
(matrix, base, transformed_base)Transform differential using a 3x3 matrix in a Cartesian basis.
Attributes Documentation
- attr_classes = {'d_lat': <class 'astropy.units.quantity.Quantity'>, 'd_lon': <class 'astropy.units.quantity.Quantity'>}¶
- d_lat¶
Component ‘d_lat’ of the Differential.
- d_lon¶
Component ‘d_lon’ of the Differential.
Methods Documentation
- classmethod from_cartesian(other, base)[source]¶
Convert the differential from 3D rectangular cartesian coordinates to the desired class.
- Parameters:
- other
The object to convert into this differential.
- base
BaseRepresentation
The points for which the differentials are to be converted: each of the components is multiplied by its unit vectors and scale factors. Will be converted to
cls.base_representation
if needed.
- Returns:
BaseDifferential
subclass instanceA new differential object that is this class’ type.
- classmethod from_representation(representation, base=None)[source]¶
Create a new instance of this representation from another one.
- Parameters:
- representation
BaseRepresentation
instance The presentation that should be converted to this class.
- baseinstance of
cls.base_representation
The base relative to which the differentials will be defined. If the representation is a differential itself, the base will be converted to its
base_representation
to help convert it.
- representation
- represent_as(other_class, base=None)[source]¶
Convert coordinates to another representation.
If the instance is of the requested class, it is returned unmodified. By default, conversion is done via cartesian coordinates.
- Parameters:
- other_class
BaseRepresentation
subclass The type of representation to turn the coordinates into.
- baseinstance of
self.base_representation
Base relative to which the differentials are defined. If the other class is a differential representation, the base will be converted to its
base_representation
.
- other_class
- to_cartesian(base)[source]¶
Convert the differential to 3D rectangular cartesian coordinates.
- Parameters:
- baseinstance of
self.base_representation
The points for which the differentials are to be converted: each of the components is multiplied by its unit vectors and scale factors.
- baseinstance of
- Returns:
CartesianDifferential
This object, converted.
- transform(matrix, base, transformed_base)[source]¶
Transform differential using a 3x3 matrix in a Cartesian basis.
This returns a new differential and does not modify the original one.
- Parameters:
- matrix(3,3) array_like
A 3x3 (or stack thereof) matrix, such as a rotation matrix.
- baseinstance of
cls.base_representation
Base relative to which the differentials are defined. If the other class is a differential representation, the base will be converted to its
base_representation
.- transformed_baseinstance of
cls.base_representation
Base relative to which the transformed differentials are defined. If the other class is a differential representation, the base will be converted to its
base_representation
.