AffineTransformation2D

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

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)[source]

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