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mam2sug

(Removed) Transform Mamdani fuzzy inference system into Sugeno fuzzy inference system

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mam2sug has been removed. Use convertToSugeno instead. For more information, see Version History.

Syntax

sugFIS = mam2sug(mamFIS)

Description

sugFIS = mam2sug(mamFIS) transforms a Mamdani fuzzy inference system into a Sugeno fuzzy inference system.

example

Examples

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Load a Mamdani fuzzy inference system.

mam_fismat = readfis('mam22.fis');

Convert this system to a Sugeno fuzzy inference system.

sug_fismat = mam2sug(mam_fismat);

Plot the output surfaces for both fuzzy systems.

subplot(2,2,1)
gensurf(mam_fismat)
title('Mamdani system (Output 1)')
subplot(2,2,2)
gensurf(sug_fismat)
title('Sugeno system (Output 1)')
subplot(2,2,3)
gensurf(mam_fismat,gensurfOptions('OutputIndex',2))
title('Mamdani system (Output 2)')
subplot(2,2,4)
gensurf(sug_fismat,gensurfOptions('OutputIndex',2))
title('Sugeno system (Output 2)')

The output surfaces for both systems are similar.

Input Arguments

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Mamdani fuzzy inference system, specified as a structure. Construct mamFIS at the command line or using the Fuzzy Logic Designer. For more information, see Build Fuzzy Systems at the Command Line and Build Fuzzy Systems Using Fuzzy Logic Designer.

Output Arguments

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Sugeno fuzzy inference system, returned as a structure. sugFIS:

  • Has constant output membership functions, whose values correspond to the centroids of the output membership functions in mamFIS

  • Uses the weighted-average defuzzification method

  • Uses the product implication method

  • Uses the sum aggregation method

The remaining properties of sugFIS, including the input membership functions and rule definitions remain unchanged from mamFIS.

Tips

  • If you have a functioning Mamdani fuzzy inference system, consider using mam2sug to convert to a more computationally efficient Sugeno structure to improve performance.

  • If sugFIS has a single output variable and you have appropriate measured input/output training data, you can tune the membership function parameters of sugFIS using anfis.

Version History

Introduced before R2006a

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R2024b: Removed

mam2sug has been removed. Use convertToSugeno instead. To update your code, change the function name from mam2sug to convertToSugeno. The syntaxes are equivalent.

See Also

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