PowLaw1D

class sherpa.models.basic.PowLaw1D(name='powlaw1d')

Bases: sherpa.models.model.ArithmeticModel

One-dimensional power-law function.

It is assumed that the independent axis is positive at all points.

gamma

The photon index of the power law.

ref

As the reference point is degenerate with the amplitude, the alwaysfrozen attribute of the reference point is set so that it can not be varied during a fit.

ampl

The amplitude of the model.

See also

Polynom1D

Notes

The functional form of the model for points is:

f(x) = ampl * (x / ref)^(-gamma)

and for an integrated grid it is the integral of this over the bin.

Attributes Summary

thawedparhardmaxes
thawedparhardmins
thawedparmaxes
thawedparmins
thawedpars

Methods Summary

apply(outer, \*otherargs, \*\*otherkwargs)
calc(pars, xlo, \*args, \*\*kwargs)
get_center()
guess(dep, \*args, \*\*kwargs)
reset()
set_center(\*args, \*\*kwargs)
startup()
teardown()

Attributes Documentation

thawedparhardmaxes

thawedparhardmins

thawedparmaxes

thawedparmins

thawedpars

Methods Documentation

apply(outer, *otherargs, **otherkwargs)

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

get_center()

guess(dep, *args, **kwargs)

reset()

set_center(*args, **kwargs)

startup()

teardown()