Schechter¶

class sherpa.astro.models.Schechter(name='schechter')[source]¶

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)[source]¶

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()