Schechter

class sherpa.astro.models.Schechter(name='schechter')

Bases: sherpa.models.model.RegriddableModel1D

One-dimensional Schecter model function.

This model is for integrated data grids only.

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

Attributes Summary

thawedparhardmaxes
thawedparhardmins
thawedparmaxes
thawedparmins
thawedpars

Methods Summary

apply(outer, *otherargs, **otherkwargs)
calc(pars, xlo, *args, **kwargs)
get_center()
guess(dep, *args, **kwargs)	Set an initial guess for the parameter values.
regrid(*arrays)
reset()
set_center(*args, **kwargs)
startup()	Called before a model may be evaluated multiple times.
teardown()	Called after a model may be evaluated multiple times.

Attributes Documentation

thawedparhardmaxes

thawedparhardmins

thawedparmaxes

thawedparmins

thawedpars

Methods Documentation

apply(outer, *otherargs, **otherkwargs)

calc(pars, xlo, *args, **kwargs)

get_center()

guess(dep, *args, **kwargs)

Set an initial guess for the parameter values.

Attempt to set the parameter values, and ranges, for the model to match the data values. This is intended as a rough guess, so it is expected that the model is only evaluated a small number of times, if at all.

regrid(*arrays)

reset()

set_center(*args, **kwargs)

startup()

Called before a model may be evaluated multiple times.

See also

teardown()

teardown()

Called after a model may be evaluated multiple times.

See also

setup()