StepLo1D¶
-
class
sherpa.models.basic.
StepLo1D
(name='steplo1d')[source]¶ Bases:
sherpa.models.model.RegriddableModel1D
One-dimensional step function.
The model is flat below
xcut
, where it is set to theampl
parameter, and zero above this.-
xcut
¶ The position of the step.
-
ampl
¶ The amplitude of the step.
Notes
The functional form of the model for points is:
f(x) = ampl if x <= xcut = 0 otherwise
and for an integrated grid it is:
f(xlo,xhi) = ampl * (xhi - xlo) if xhi <= xcut = ampl * (xcut - xlo) if xlo <= xcut and xhi > xcut = 0 if xlo > xcut
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
()¶ Called after a model may be evaluated multiple times.
See also
setup()
-