AffineTransformation2D

class astropy.modeling.projections.AffineTransformation2D(matrix=[[1.0, 0.0], [0.0, 1.0]], translation=[0.0, 0.0], **kwargs)

Bases: astropy.modeling.Model

Perform an affine transformation in 2 dimensions.

Parameters:

matrix : array

A 2x2 matrix specifying the linear transformation to apply to the inputs

translation : array

A 2D vector (given as either a 2x1 or 1x2 array) specifying a translation to apply to the inputs

Attributes Summary

input_names	list() -> new empty list
matrix
n_inputs	int(x=0) -> int or long
n_outputs	int(x=0) -> int or long
param_names	list() -> new empty list
standard_broadcasting	bool(x) -> bool
translation

Methods Summary

eval(*args, **kwargs)	Deprecated since version 1.0.
evaluate(x, y, matrix, translation)	Apply the transformation to a set of 2D Cartesian coordinates given as two lists–one for the x coordinates and one for a y coordinates–or a single coordinate pair.
inverse()	Inverse transformation.

Attributes Documentation

input_names = []

matrix

n_inputs = 2

n_outputs = 2

param_names = ['matrix', 'translation']

standard_broadcasting = False

translation

Methods Documentation

eval(*args, **kwargs)

Deprecated since version 1.0: The eval function is deprecated and may be removed in a future version. Use AffineTransformation2D.evaluate instead.

Apply the transformation to a set of 2D Cartesian coordinates given as two lists–one for the x coordinates and one for a y coordinates–or a single coordinate pair.

Parameters:

x, y : array, float

x and y coordinates

evaluate(x, y, matrix, translation)

Apply the transformation to a set of 2D Cartesian coordinates given as two lists–one for the x coordinates and one for a y coordinates–or a single coordinate pair.

Parameters:

x, y : array, float

x and y coordinates

inverse()

Inverse transformation.

Raises InputParameterError if the transformation cannot be inverted.