Synopsis
One-dimensional Schechter model function.
Syntax
schechter
Description
This model is for integrated data grids only.
Example
>>> create_model_component("schechter", "mdl") >>> print(mdl)
Create a component of the schechter model and display its default parameters. The output is:
mdl Param Type Value Min Max Units ----- ---- ----- --- --- ----- mdl.alpha thawed 10 -3.40282e+38 3.40282e+38 mdl.ref thawed 1 -3.40282e+38 3.40282e+38 mdl.norm thawed 1 -3.40282e+38 3.40282e+38
ATTRIBUTES
The attributes for this object are:
Attribute | Definition |
---|---|
alpha | The slope of the power-law component. |
ref | The reference position, which controls the switch from the power-law to the exponential. |
norm | The normalisation of the model. |
Notes
The functional form of the model for grids is:
f(xlo,xhi) = norm * (xlo / ref)^alpha * exp(-xlo / ref) * (xhi - xlo) / ref
and for points the model is:
f(x) = 0
Bugs
See the bugs pages on the Sherpa website for an up-to-date listing of known bugs.