Disk2D¶
-
class
astropy.modeling.functional_models.
Disk2D
(amplitude=1, x_0=0, y_0=0, R_0=1, **kwargs)[source]¶ Bases:
astropy.modeling.Fittable2DModel
Two dimensional radial symmetric Disk model.
- Parameters
- amplitudefloat
Value of the disk function
- x_0float
x position center of the disk
- y_0float
y position center of the disk
- R_0float
Radius of the disk
- Other Parameters
- fixeda dict, optional
A dictionary
{parameter_name: boolean}
of parameters to not be varied during fitting. True means the parameter is held fixed. Alternatively thefixed
property of a parameter may be used.- tieddict, optional
A dictionary
{parameter_name: callable}
of parameters which are linked to some other parameter. The dictionary values are callables providing the linking relationship. Alternatively thetied
property of a parameter may be used.- boundsdict, optional
A dictionary
{parameter_name: value}
of lower and upper bounds of parameters. Keys are parameter names. Values are a list or a tuple of length 2 giving the desired range for the parameter. Alternatively, themin
andmax
properties of a parameter may be used.- eqconslist, optional
A list of functions of length
n
such thateqcons[j](x0,*args) == 0.0
in a successfully optimized problem.- ineqconslist, optional
A list of functions of length
n
such thatieqcons[j](x0,*args) >= 0.0
is a successfully optimized problem.
See also
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
This property is used to indicate what units or sets of units the evaluate method expects, and returns a dictionary mapping inputs to units (or
None
if any units are accepted).Methods Summary
evaluate
(x, y, amplitude, x_0, y_0, R_0)Two dimensional Disk model function
Attributes Documentation
-
R_0
= Parameter('R_0', value=1.0)¶
-
amplitude
= Parameter('amplitude', value=1.0)¶
-
input_units
¶
-
param_names
= ('amplitude', 'x_0', 'y_0', 'R_0')¶
-
x_0
= Parameter('x_0', value=0.0)¶
-
y_0
= Parameter('y_0', value=0.0)¶
Methods Documentation