How to create membership functions matlab in triangular form?

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mindo akami
mindo akami am 9 Jun. 2021
Bearbeitet: Sam Chak am 22 Mär. 2022
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 )

Antworten (2)

darova
darova am 9 Jun. 2021
Use sine wave
x = 0:pi/2:20;
y = sin(x);
plot(x,y)
  2 Kommentare
mindo akami
mindo akami am 9 Jun. 2021
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 am 24 Jul. 2021
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 am 22 Mär. 2022
Bearbeitet: Sam Chak am 22 Mär. 2022
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:
Result:

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