Display problem of membership functions in Fuzzy Logic Designer

Question

hgrlk 2021-3-30

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https://ww2.mathworks.cn/matlabcentral/answers/788339-display-problem-of-membership-functions-in-fuzzy-logic-designer

回答： Sam Chak 2025-4-14

Hello,

I have a problem about matlab fuzzy tool. I have data and i want to use matlab fuzzy tool to get membership functions. I determined the membership values and the parameters. I have 5 parameters and only one of them is triangular.. Others are trapezodial functions. When I write the determined parameter values to Matlab, I got the plot but as you can see, there is fluctuation in the line. I dont understand why I get this. Is this a Matlab's bug or sth?

I will add the plots at the attachments.

Thank you for your help..

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Answer 1

Sam Chak 2025-4-14

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https://ww2.mathworks.cn/matlabcentral/answers/788339-display-problem-of-membership-functions-in-fuzzy-logic-designer#answer_1563623

Hi @hgrlk

In the older Fuzzy Logic Designer UI tool (R2022a and earlier), the default number of plot points is 181, as indicated in the top right corner of the UI. To enhance the display of the membership functions, increase the number of plot points until the plots appear satisfactory.