Delta2D

class sherpa.models.basic.Delta2D(name='delta2d')

Bases: sherpa.models.model.ArithmeticModel

Two-dimensional delta function.

The model is only defined at a single point (or bin for integrated grids).

xpos

The coordinate of the signal on the x0 axis.

ypos

The coordinate of the signal on the x1 axis.

ampl

The amplitude.

See also

Box2D, Const2D, Delta1D

Notes

The functional form of the model for points is:

f(x0, x1) = ampl if x0 == xpos and x1 == ypos
     = 0         otherwise

and for an integrated grid it is:

f(x0lo, x1lo, x0hi, x1hi) = ampl if x0lo <= xpos <= x0hi
                                    x1lo <= ypos <= x1hi
                          = 0    otherwise

This behavior is different to how the amplitude is handled in other models, such as Const2D.

Attributes Summary

thawedparhardmaxes
thawedparhardmins
thawedparmaxes
thawedparmins
thawedpars

Methods Summary

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

Attributes Documentation

thawedparhardmaxes

thawedparhardmins

thawedparmaxes

thawedparmins

thawedpars

Methods Documentation

apply(outer, *otherargs, **otherkwargs)

calc(*args, **kwargs)

get_center()

guess(dep, *args, **kwargs)

reset()

set_center(xpos, ypos, *args, **kwargs)

startup()

teardown()