RadialDifferential

class astropy.coordinates.RadialDifferential(*args, **kwargs)

Bases: BaseDifferential

Differential(s) of radial distances.

Parameters:

d_distanceQuantity

The differential distance.

copybool, optional

If True (default), arrays will be copied. If False, arrays will be references, though possibly broadcast to ensure matching shapes.

Attributes Summary

attr_classes
d_distance	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)

Convert the differential from 3D rectangular cartesian coordinates to the desired class.

Parameters:

other

The object to convert into this differential.

baseBaseRepresentation

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 instance

A new differential object that is this class’ type.

classmethod from_representation(representation, base=None)

Create a new instance of this representation from another one.

Parameters:

representationBaseRepresentation 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.

norm(base=None)

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.

Returns:

normastropy.units.Quantity

Vector norm, with the same shape as the representation.

to_cartesian(base)

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.

Returns:

CartesianDifferential

This object, converted.