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 in1/`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

• pw_extract

Maturity

stable

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

Bugs

None. It is perfect.