Last modified: December 2023

URL: https://cxc.cfa.harvard.edu/sherpa/ahelp/log10.html
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AHELP for CIAO 4.16 Sherpa

log10

Context: models

Synopsis

One-dimensional logarithm function, base 10.

Syntax

log10

Example

>>> create_model_component("log10", "mdl")
>>> print(mdl)

Create a component of the log10 model and display its default parameters. The output is:

mdl
   Param        Type          Value          Min          Max      Units
   -----        ----          -----          ---          ---      -----
   mdl.offset   thawed            0 -3.40282e+38  3.40282e+38           
   mdl.coeff    thawed           -1 -3.40282e+38  3.40282e+38           
   mdl.ampl     thawed            1            0  3.40282e+38           

ATTRIBUTES

The attributes for this object are:

Attribute Definition
offset The offset of the model.
coeff The scaling factor.
ampl The amplitude of the model.

Notes

The functional form of the model for points is:

f(x) = ampl * log_10 (coeff * (x - offset))

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
exp, exp10, log, logparabola, sqrt