mirror of
https://github.com/triqs/dft_tools
synced 2024-12-27 23:03:51 +01:00
49 lines
1.2 KiB
ReStructuredText
49 lines
1.2 KiB
ReStructuredText
|
|
||
|
|
.. module:: pytriqs.fit.fit
|
||
|
|
|
||
|
|
Fitting data
|
||
|
|
====================
|
||
|
|
|
||
|
|
A simple example
|
||
|
|
^^^^^^^^^^^^^^^^^^^^^
|
||
|
|
|
||
|
|
Let us for example fit the Green function :
|
||
|
|
|
||
|
|
|
||
|
|
.. plot:: reference/python/data_analysis/fit/fit_test.py
|
||
|
|
:include-source:
|
||
|
|
:scale: 70
|
||
|
|
|
||
|
|
Note that `x_window` appears in the `x_data_view` method to clip the data on a given window
|
||
|
|
and in the plot function, to clip the plot itself.
|
||
|
|
|
||
|
|
A more complex example
|
||
|
|
^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
||
|
|
|
||
|
|
To illustrate the use of python in a more complex situation,
|
||
|
|
let us demonstrate a simple data analysis.
|
||
|
|
This does not show any more TRIQS object, it is just a little exercise in python...
|
||
|
|
|
||
|
|
Imagine that we have 10 Green function coming from a calculation in a hdf5 file.
|
||
|
|
For the need of the demonstration, we will create them "manually" here, but it is just to make life easier.
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
Reference
|
||
|
|
^^^^^^^^^^^^^^^
|
||
|
|
|
||
|
|
The Fit class is very simple and is provided for convenience, but the reader
|
||
|
|
is encouraged to read it and adapt it (it is simply a call to scipy.leastsq).
|
||
|
|
|
||
|
|
.. autoclass:: pytriqs.fit.Fit
|
||
|
|
:members:
|
||
|
|
|
||
|
|
|
||
|
|
Example of fitfunc::
|
||
|
|
|
||
|
|
linear = lambda X, a,b : a * X + b, r"$%f x + %f$" , (1,1)
|
||
|
|
quadratic = lambda X, a,b,c : (a * X + b)*Omega + c, r"$%f x^2 + %f x + %f$" , (0,1,1)
|
||
|
|
|
||
|
|
|
||
|
|
|