schechter

Context: models

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.

/ sherpa4.17 / ahelp / schechter.html