RadialDifferential¶

class
astropy.coordinates.
RadialDifferential
(*args, **kwargs)[source]¶ Bases:
astropy.coordinates.BaseDifferential
Differential(s) of radial distances.
 Parameters
Attributes Summary
Component ‘d_distance’ 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.
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

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

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 nonangular 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.