ExponentialCutoffPowerLaw1D¶
-
class
astropy.modeling.powerlaws.
ExponentialCutoffPowerLaw1D
(amplitude=1, x_0=1, alpha=1, x_cutoff=1, **kwargs)[source]¶ Bases:
astropy.modeling.Fittable1DModel
One dimensional power law model with an exponential cutoff.
- Parameters
- amplitudefloat
Model amplitude
- x_0float
Reference point
- alphafloat
Power law index
- x_cutofffloat
Cutoff point
See also
Notes
Model formula (with \(A\) for
amplitude
and \(\alpha\) foralpha
):\[f(x) = A (x / x_0) ^ {-\alpha} \exp (-x / x_{cutoff})\]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, amplitude, x_0, alpha, x_cutoff)One dimensional exponential cutoff power law model function
fit_deriv
(x, amplitude, x_0, alpha, x_cutoff)One dimensional exponential cutoff power law derivative with respect to parameters
Attributes Documentation
-
alpha
= Parameter('alpha', value=1.0)¶
-
amplitude
= Parameter('amplitude', value=1.0)¶
-
input_units
¶
-
param_names
= ('amplitude', 'x_0', 'alpha', 'x_cutoff')¶
-
x_0
= Parameter('x_0', value=1.0)¶
-
x_cutoff
= Parameter('x_cutoff', value=1.0)¶
Methods Documentation