Functions for interval type-2 fuzzy logic systems

Implement interval type-2 fuzzy logic systems and a very efficient type-reduction algorithm.
Updated 24 Jan 2023

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This package contains the following files:
example.m: Illustrates how to use the function IT2FLS.
IT2FLS.m: Implements an interval type-2 fuzzy logic system.
Type-1 and Interval Type-2 Fuzzy Systems.pdf
A Brief Tutorial on Interval Type-2 Fuzzy Sets and Systems.pdf
Designing Practical Interval Type-2 Fuzzy Logic Systems Made Simple.pdf
Representation of an IT2 FS.pdf
All these files, and many other useful papers, can also be downloaded from

Cite As

Dongrui Wu (2024). Functions for interval type-2 fuzzy logic systems (, MATLAB Central File Exchange. Retrieved .

MATLAB Release Compatibility
Created with R2018b
Compatible with any release
Platform Compatibility
Windows macOS Linux
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Version Published Release Notes

Updated some instructions

Minor updates

New and updated documentaions are added.

Updated the link to many other papers.

Updated the type reduction algorithm.