Linear1D¶
-
class
astropy.modeling.functional_models.
Linear1D
(slope=1, intercept=0, **kwargs)[source]¶ Bases:
astropy.modeling.Fittable1DModel
One dimensional Line model.
- Parameters
- slope
python:float
Slope of the straight line
- intercept
python:float
Intercept of the straight line
- slope
- Other Parameters
- fixed
a
python: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.- tied
python:dict
, 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.- bounds
python:dict
, 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.- eqcons
python:list
, optional A list of functions of length
n
such thateqcons[j](x0,*args) == 0.0
in a successfully optimized problem.- ineqcons
python:list
, optional A list of functions of length
n
such thatieqcons[j](x0,*args) >= 0.0
is a successfully optimized problem.
- fixed
See also
Notes
Model formula:
\[f(x) = a x + b\]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, slope, intercept)One dimensional Line model function
fit_deriv
(x, *params)One dimensional Line model derivative with respect to parameters
Attributes Documentation
-
input_units
¶
-
intercept
= Parameter('intercept', value=0.0)¶
-
linear
= True¶
-
param_names
= ('slope', 'intercept')¶
-
slope
= Parameter('slope', value=1.0)¶
Methods Documentation