Last modified: December 2018

URL: http://cxc.harvard.edu/sherpa/ahelp/tan.html
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AHELP for CIAO 4.11 Sherpa v1

tan

Context: models

Synopsis

One-dimensional tan function.

Syntax

tan

Example

>>> create_model_component("tan", "mdl")
>>> print(mdl)

Create a component of the tan 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:

period

The period of the tangent, in units of the independent axis.

offset

The offset (related to the phase) of the tangent.

ampl

The amplitude of the tangent.

Notes

The functional form of the model for points is:

f(x) = ampl * tan (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.

See Also

models
cos, sin