RadialDifferential¶
- class astropy.coordinates.RadialDifferential(*args, **kwargs)[source]¶
Bases:
astropy.coordinates.representation.BaseDifferential
Differential(s) of radial distances.
- Parameters
- d_distance
Quantity
The differential distance.
- copybool, optional
If
True
(default), arrays will be copied. IfFalse
, arrays will be references, though possibly broadcast to ensure matching shapes.
- d_distance
Attributes Summary
Component 'd_distance' of the Differential.
Methods Summary
from_cartesian
(other, base)from_representation
(representation[, base])norm
([base])Vector norm.
to_cartesian
(base)Convert the differential to 3D rectangular cartesian coordinates.
Attributes Documentation
- attr_classes = {'d_distance': <class 'astropy.units.quantity.Quantity'>}¶
- d_distance¶
Component ‘d_distance’ of the Differential.
Methods Documentation
- norm(base=None)[source]¶
Vector norm.
The norm is the standard Frobenius norm, i.e., the square root of the sum of the squares of all components with non-angular units.
- Parameters
- baseinstance of
self.base_representation
Base relative to which the differentials are defined. This is required to calculate the physical size of the differential for all but Cartesian differentials or radial differentials.
- baseinstance of
- Returns
- norm
astropy.units.Quantity
Vector norm, with the same shape as the representation.
- norm
- 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.