astropy:docs

Disk2D

class astropy.modeling.functional_models.Disk2D(amplitude, x_0, y_0, R_0, **constraints)[source] [edit on github]

Bases: astropy.modeling.core.Parametric2DModel

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

Notes

Model formula:

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

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.

Attributes Summary

R_0
amplitude
param_names list() -> new empty list
x_0
y_0

Methods Summary

eval(x, y, amplitude, x_0, y_0, R_0) Two dimensional Disk model function

Attributes Documentation

R_0
amplitude
param_names = ['amplitude', 'x_0', 'y_0', 'R_0']
x_0
y_0

Methods Documentation

static eval(x, y, amplitude, x_0, y_0, R_0)[source] [edit on github]

Two dimensional Disk model function

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