How to design the membership function in matlab?

Hi,

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

Answer 1

[Alan Stevens]

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);
plot(x,y)