How to design the membership function in matlab?

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i did the rule 1 and 2 in matlab with trimf function as you can see (see the attached image)
but for the rule 3 and 4 i don't get any idea how to design them
hope someon can help me with that thanks

Accepted Answer

Alan Stevens
Alan Stevens on 11 Jun 2021
Edited: Alan Stevens on 11 Jun 2021
How about the following for rule 3 (I'll leave you to invert for rule 4).
x = [-180 -90 -89.001 89.001 90 180];
y = (x+180)/90.*(x<=-90)+(180-x)/90.*(x>=90);

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