# Planar2D¶

class astropy.modeling.functional_models.Planar2D(slope_x=1, slope_y=1, intercept=0, **kwargs)[source]

Two dimensional Plane model.

Parameters
slope_xfloat

Slope of the plane in X

slope_yfloat

Slope of the plane in Y

interceptfloat

Z-intercept of the plane

Notes

Model formula:

$f(x, y) = a x + b y + c$

Attributes Summary

 intercept linear param_names Names of the parameters that describe models of this type. slope_x slope_y

Methods Summary

 evaluate(x, y, slope_x, slope_y, intercept) Two dimensional Plane model function fit_deriv(x, y, *params) Two dimensional Plane model derivative with respect to parameters

Attributes Documentation

intercept = Parameter('intercept', value=0.0)
linear = True
param_names = ('slope_x', 'slope_y', 'intercept')

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.

slope_x = Parameter('slope_x', value=1.0)
slope_y = Parameter('slope_y', value=1.0)

Methods Documentation

static evaluate(x, y, slope_x, slope_y, intercept)[source]

Two dimensional Plane model function

static fit_deriv(x, y, *params)[source]

Two dimensional Plane model derivative with respect to parameters