Delta1D

class sherpa.models.basic.Delta1D(name='delta1d')

Bases: sherpa.models.model.RegriddableModel1D

One-dimensional delta function.

The delta function model is only non-zero at a single point (or bin for integrated grids).

pos

The position of the signal.

ampl

The amplitude.

See also

Box1D, Const1D, Delta2D, StepLo1D, StepHi1D

Notes

The functional form of the model for points is:

f(x) = ampl if x == pos
     = 0       otherwise

and for an integrated grid it is:

f(lo,hi) = ampl         if lo <= pos <= hi
         = 0            otherwise

This behavior is different to how the amplitude is handled in other models, such as Const1D.

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(pos, *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(pos, *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()