AffineTransformation2D

class astropy.modeling.projections.AffineTransformation2D(matrix=Parameter('matrix', value=[[1. 0.] [0. 1.]]), translation=Parameter('translation', value=[0. 0.]), **kwargs)

Bases: astropy.modeling.Model

Perform an affine transformation in 2 dimensions.

Parameters

matrixarray

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

translationarray

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

Attributes Summary

input_units	This property is used to indicate what units or sets of units the evaluate method expects, and returns a dictionary mapping inputs to units (or None if any units are accepted).
matrix
n_inputs
n_outputs
param_names
standard_broadcasting
translation

Methods Summary

__call__(*inputs[, model_set_axis, …])	Evaluate this model using the given input(s) and the parameter values that were specified when the model was instantiated.
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.

Attributes Documentation

input_units

matrix = Parameter('matrix', value=[[1. 0.] [0. 1.]])

n_inputs = 2

n_outputs = 2

param_names = ('matrix', 'translation')

standard_broadcasting = False

translation = Parameter('translation', value=[0. 0.])

Methods Documentation

__call__(*inputs, model_set_axis=None, with_bounding_box=False, fill_value=nan, equivalencies=None, inputs_map=None, **new_inputs)

Evaluate this model using the given input(s) and the parameter values that were specified when the model was instantiated.

classmethod 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, yarray, float

x and y coordinates