Disk2D

class astropy.modeling.functional_models.Disk2D(amplitude=1, x_0=0, y_0=0, R_0=1, **kwargs)

Bases: astropy.modeling.Fittable2DModel

Two dimensional radial symmetric Disk model.

Parameters:

amplitude : float

Value of the disk function

x_0 : float

x position center of the disk

y_0 : float

y position center of the disk

R_0 : float

Radius of the disk

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

Box2D, TrapezoidDisk2D

Notes

Model formula:

\[\begin{split}f(r) = \left \{ \begin{array}{ll} A & : r \leq R_0 \\ 0 & : r > R_0 \end{array} \right.\end{split}\]

Attributes Summary

R_0
amplitude
input_units
param_names
x_0
y_0

Methods Summary

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

Two dimensional Disk model function

Attributes Documentation

R_0

amplitude

input_units

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

x_0

y_0

Methods Documentation

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

Two dimensional Disk model function