Synopsis
One-dimensional step function.
Syntax
stephi1d
Description
The model is flat above xcut , where it is set to the ampl parameter, and zero below this.
Example
>>> create_model_component("stephi1d", "mdl") >>> print(mdl)
Create a component of the stephi1d model and display its default parameters. The output is:
mdl Param Type Value Min Max Units ----- ---- ----- --- --- ----- mdl.xcut thawed 0 -3.40282e+38 3.40282e+38 mdl.ampl thawed 1 0 3.40282e+38
ATTRIBUTES
The attributes for this object are:
Attribute | Definition |
---|---|
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 xlo >= xcut = ampl * (xhi - xcut) if xlo < xcut and xhi >= xcut = 0 if xhi < xcut
Bugs
See the bugs pages on the Sherpa website for an up-to-date listing of known bugs.