RedshiftScaleFactor

class astropy.modeling.functional_models.RedshiftScaleFactor(z=0, **kwargs)

Bases: Fittable1DModel

One dimensional redshift scale factor model.

Parameters:

zfloat

Redshift value.

Notes

Model formula:

\[f(x) = x (1 + z)\]

Attributes Summary

param_names	Names of the parameters that describe models of this type.
z

Methods Summary

evaluate(x, z)	One dimensional RedshiftScaleFactor model function.
fit_deriv(x, z)	One dimensional RedshiftScaleFactor model derivative.

Attributes Documentation

param_names = ('z',)

Names of the parameters that describe models of this type.

The parameters in this tuple are in the same order they should be passed in when initializing a model of a specific type. Some types of models, such as polynomial models, have a different number of parameters depending on some other property of the model, such as the degree.

When defining a custom model class the value of this attribute is automatically set by the Parameter attributes defined in the class body.

z = Parameter('z', value=0.0)

Methods Documentation

static evaluate(x, z)

One dimensional RedshiftScaleFactor model function.

static fit_deriv(x, z)

One dimensional RedshiftScaleFactor model derivative.