Find pairings with integrity (findICI)

Finds pairings for decentralized control which satisfy necessary conditions for integrity.
Updated 3 Sep 2022

View License

function [CC,criteria]=findICI(G)
Returns in CC all the pairings which satisfy the necessary condition for integrity (ICI) derived fron the Niederlinski Index. This function can be applied to square systems with a maximum size of 8x8.
The input "G" must be a square matrix of real values which represents the dc-gain of the system.
"CC" is a matrix, where each of the rows represents a pairing. For a given row, the value of the i-th element is the index of the input which is paired with the i-th output (see example below).
"criteria" is a quantification of the level of the interaction of the pairings. The k-th element in the criteria vector is associated to the pairing represented by the k-th row of CC. For each pairing, the quantification used is the sum of all the considered elements in the Relative Interaction Array accumulated for all the possible partially controlled systems.
Example: Consider the following DC-gain system fot a Petlyuk distillation column used in by K.E. Haeggblom (1997)with four inputs u1,u2,u3,u4 and four outputs y1,y2,y3,y4.
G=[153.45, -179.34, 0.23, 0.03;
-157.67, 184.75, -0.10, 21.63;
24.63, -28.97, -0.23, -0.1;
-4.8, 6.09, 0.13, -2.41];
Calling to these function returns the calue of "CC":
CC= [3 4 1 2;
1 2 3 4]
The first row of CC represents the paring y1-u3, y2-u4, y3-u1, y4-u2. The second row of CC represents the diagonal pairing y1-u1, y2-u2, y3-u3, y4-u4.
The returned value of criteria is: criteria= [29.2847, 117.7139], indicating that the first pairing is
preferred, since the second pairing presents a larger amount of interaction.

Cite As

Miguel Castaño Arranz (2024). Find pairings with integrity (findICI) (, MATLAB Central File Exchange. Retrieved .

MATLAB Release Compatibility
Created with R2016a
Compatible with any release
Platform Compatibility
Windows macOS Linux

Inspired by: Partial Relative Gain (PRG)


Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!
Version Published Release Notes

Add figure

Adapted description

Description adapted
Updated description
Description adapted