TrapezoidDisk2D

class astropy.modeling.functional_models.TrapezoidDisk2D(amplitude=1, x_0=0, y_0=0, R_0=1, slope=1, **kwargs)

Bases: astropy.modeling.Fittable2DModel

Two dimensional circular Trapezoid model.

Parameters:

amplitude : float

Amplitude of the trapezoid

x_0 : float

x position of the center of the trapezoid

y_0 : float

y position of the center of the trapezoid

R_0 : float

Radius of the constant part of the trapezoid.

slope : float

Slope of the tails of the trapezoid in x direction.

Other Parameters:  

fixed : a dict

A dictionary {parameter_name: boolean} of parameters to not be varied during fitting. True means the parameter is held fixed. Alternatively the fixed property of a parameter may be used.

tied : dict

A dictionary {parameter_name: callable} of parameters which are linked to some other parameter. The dictionary values are callables providing the linking relationship. Alternatively the tied property of a parameter may be used.

bounds : dict

A dictionary {parameter_name: boolean} of lower and upper bounds of parameters. Keys are parameter names. Values are a list of length 2 giving the desired range for the parameter. Alternatively the min and max properties of a parameter may be used.

eqcons : list

A list of functions of length n such that eqcons[j](x0,*args) == 0.0 in a successfully optimized problem.

ineqcons : list

A list of functions of length n such that ieqcons[j](x0,*args) >= 0.0 is a successfully optimized problem.

See also

Disk2D, Box2D

Attributes Summary

R_0
amplitude
input_units
param_names
slope
x_0
y_0

Methods Summary

evaluate(x, y, amplitude, x_0, y_0, R_0, slope)

Two dimensional Trapezoid Disk model function

Attributes Documentation

R_0

amplitude

input_units

param_names = ('amplitude', 'x_0', 'y_0', 'R_0', 'slope')

slope

x_0

y_0

Methods Documentation

static evaluate(x, y, amplitude, x_0, y_0, R_0, slope)

Two dimensional Trapezoid Disk model function