# Name

imf_params_cl1 - fit image formation parameters using constrained simplex method

# Usage

- res = imf_params_cl1(pw2, n1, iswi = 1, Pixel_size = 1)

## Input

- pw2
- a list contains 1D rotationally averaged power spectrum
- n1
``n+1``,``n``is The rank of polynomial applied for fitting- Pixel_size
Pixel_size, it can be set an arbitary constant if is not required to give frequencies in

`1/`Å``.

## Output

- res[0]
- the frequnecies 1/angstrom
- res[1]
- fitting background or envelope function
- res[2]
- The original power spectrum for paramters extracting
- res[3]
The number of extracted paramters is equal to len(

``res[3]``)=``n_1``

## Options

# Description

- 1. This program is supposed to extract the conventional background noise using constrained simplex method. The background noise is supposed to have the form of
a.

``N_2=e^(a_1*X+a_0)``b.

``N_2=e^(a_2*X^2+a_1*X+a_0)````...``c.

``N_2=e^(a_n*X^n+...+a_1*X+a_0)``- 2. The fitting is performed in logrithm scale.

# Method

# Reference

# Author / Maintainer

Zhong Huang

# Keywords

- category 1
- UTILITIES

# Files

utilities.py

# See also

# Maturity

- stable
- currently disabled/works for most people, has been tested; test cases/examples available.

# Bugs

None. It is perfect.