Synopsis
One-dimensional cosine function.
Syntax
cos
Example
>>> create_model_component("cos", "mdl")
>>> print(mdl)Create a component of the cos model and display its default parameters. The output is:
mdl Param Type Value Min Max Units ----- ---- ----- --- --- ----- mdl.period thawed 1 1e-10 10 mdl.offset thawed 0 0 3.40282e+38 mdl.ampl thawed 1 1e-05 3.40282e+38
ATTRIBUTES
The attributes for this object are:
| Attribute | Definition |
|---|---|
| period | The period of the cosine, in units of the independent axis. |
| offset | The offset (related to the phase) of the cosine. |
| ampl | The amplitude of the cosine. |
Notes
The functional form of the model for points is:
f(x) = ampl * cos (2 * pi * (x - offset) / period)
and for an integrated grid it is the integral of this over the bin.
Bugs
See the bugs pages on the Sherpa website for an up-to-date listing of known bugs.