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How to create membership functions matlab in triangular form?

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mindo akami
mindo akami 2021-6-9
编辑： Sam Chak 2022-3-22
Hi, hoping somone can help
i add the rule 1 and 2 with trimf function but how can i plot the rule 3 and 4 pleas (see the attched images) thanks )

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回答（2 个）

darova
darova 2021-6-9
Ran in:
Use sine wave
x = 0:pi/2:20;
y = sin(x);
plot(x,y)
  2 个评论
mindo akami
mindo akami 2021-6-9
Hi, thanks for your answer darova
but if we take the image closely the rule 3 for example is like this and i don't know how to do it
darova
darova 2021-7-24
Ran in:
Maybe manual solution?
x = [-180 -90 -90 90 90 180];
y = abs(sind(x));
y(3:4) = 0;
plot(x,y)

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Sam Chak
Sam Chak 2022-3-22
编辑：Sam Chak 2022-3-22
Hi @mindo akami
You probably have already learned the manual way to plot these. Since this is unanswered and if you are still interested in learning to plot the 'fuzzy way', here is the code:
x = -180:0.1:180; % set the domain of discourse
y1 = trimf(x,[-90 0 90]); % Rule 1
y2 = 1 - y1; % Rule 2
y3 = trimf(x,[-180 -90 -90]) + trimf(x,[90 90 180]); % Rule 3
y4 = trimf(x,[-180 -180 -90]) + trimf(x,[90 180 180]); % Rule 4
h = plot(x, y1, 'r-', x, y2, 'g-', x, y3, 'b-', x, y4, 'm-');
set(h, 'LineWidth', 1.5)
xticks([-180 -90 0 90 180]);
xlabel('x_{1}, (degree)');
ylabel('Degree of Membership, \mu');
The line colors follow the original image that you posted here:
https://www.mathworks.com/matlabcentral/answers/853935-how-to-design-the-membership-function-in-matlab
Result:

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