having error while running fuzzy controller and fuzzy set of matlab 2017 in matlab 2023?

Question

shilpam malik 2025-7-24

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2178705-having-error-while-running-fuzzy-controller-and-fuzzy-set-of-matlab-2017-in-matlab-2023

评论： Sam Chak 2025-7-28

2 inputs and 1 output with mamdani rule.

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shilpam malik 2025-7-24

编辑：Walter Roberson 2025-7-26

在 MATLAB Online 中打开

Name='abc'
Type='mamdani'
Version=2.0
NumInputs=2
NumOutputs=1
NumRules=25
AndMethod='min'
OrMethod='max'
ImpMethod='min'
AggMethod='max'
DefuzzMethod='centroid'
[Input1]
Name='error'
Range=[-1 1]
NumMFs=5
MF1='NB':'trapmf',[-1.72 -1.08 -0.8 -0.7]
MF2='NS':'trimf',[-0.8 -0.7 0]
MF3='Z':'trimf',[-0.7 0 0.7]
MF4='PS':'trimf',[0 0.7 0.8]
MF5='PB':'trapmf',[0.7 0.8 1.7 1.8]
[Input2]
Name='Derror'
Range=[-1 1]
NumMFs=5
MF1='NB':'trapmf',[-1.7 -1.5 -0.8 -0.7]
MF2='Z':'trimf',[-0.7 0 0.7]
MF3='NS':'trimf',[-0.8 -0.7 0]
MF4='PS':'trimf',[0 0.7 0.8]
MF5='PB':'trapmf',[0.7 0.8 1.3 1.5]
[Output1]
Name='U'
Range=[-1 1]
NumMFs=5
MF1='NB':'trapmf',[-1.5 -1.4 -0.8 -0.7]
MF2='Z':'trimf',[-0.7 0 0.7]
MF3='PB':'trapmf',[0.7 0.8 1.28 1.52]
MF4='NS':'trimf',[-0.8 -0.7 0]
MF5='PS':'trimf',[0 0.7 0.8]
[Rules]
1 1, 1 (1) : 1
1 3, 1 (1) : 1
1 2, 1 (1) : 1
1 4, 4 (1) : 1
1 5, 2 (1) : 1
2 1, 1 (1) : 1
2 3, 1 (1) : 1
2 2, 1 (1) : 1
2 4, 2 (1) : 1
2 5, 5 (1) : 1
3 1, 1 (1) : 1
3 3, 4 (1) : 1
3 2, 2 (1) : 1
3 4, 5 (1) : 1
3 5, 3 (1) : 1
4 1, 4 (1) : 1
4 3, 2 (1) : 1
4 2, 5 (1) : 1
4 4, 3 (1) : 1
4 5, 3 (1) : 1
5 1, 2 (1) : 1
5 3, 5 (1) : 1
5 2, 3 (1) : 1
5 4, 3 (1) : 1
5 5, 3 (1) : 1

Sam Chak 2025-7-25

Your FIS generates a saturation surface. What specific error did you get in MATLAB R2023?

shilpam malik 2025-7-25

---Input 2 expects a value in range [-1 1] but has a value of -1.77138. no rules fired for Output 1. Defuzzified output value set to its mean range value 0.

Every time i change the range of second input it exceeds the output giving output U as 0.

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Answer 1

Sam Chak 2025-7-25

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2178705-having-error-while-running-fuzzy-controller-and-fuzzy-set-of-matlab-2017-in-matlab-2023#answer_1568439

编辑：Sam Chak 2025-7-25

All five membership functions of Input 2 are defined in the range [-1, 1]. However, when Input 2 has a value of -1.77138 that is outside the range, none of the rules are triggered. Consequently, it returns the mid value of the Output range, that is (-1 + 1)/2 = 0, by default in Fuzzy Logic Toolbox.

To address the issue, make sure that the MFs are designed to cover the entire operating range of Input 2. For example, if the operating range is [-2, 2], the MFs should look like the following:

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Sam Chak 2025-7-27

移动：Sam Chak 2025-7-27

在 MATLAB Online 中打开

Hi @shilpam malik

I have written the entire code to generate the fuzzy system based on the your info in this comment, in order to demonstrate why it produces the "No rules fired for Output 1" error when the value of Input 2 is outside the range of [-1, 1].

Could you please provide the actual value of Input 1 when you ran the .fis file in R2017 and R2018?

%% Mamdani Fuzzy System

fis = mamfis;

% Fuzzy Input 1

ud1 = 1; % universe of discourse for input 1

fis = addInput(fis, [-ud1 +ud1], 'Name', 'x');

fis = addMF(fis, 'x', 'trapmf', ud1*[-1.72 -1.08 -0.8 -0.7], 'Name', 'NB');

fis = addMF(fis, 'x', 'trimf', ud1*[-0.8 -0.7 0.0], 'Name', 'NS');

fis = addMF(fis, 'x', 'trimf', ud1*[-0.7 0.0 0.7], 'Name', 'ZR');

fis = addMF(fis, 'x', 'trimf', ud1*[ 0.0 0.7 0.8], 'Name', 'PS');

fis = addMF(fis, 'x', 'trapmf', ud1*[ 0.7 0.8 1.7 1.8], 'Name', 'PB');

% Fuzzy Input 2

ud2 = 1; % universe of discourse for input 2

fis = addInput(fis, [-ud2 +ud2], 'Name', 'y');

fis = addMF(fis, 'y', 'trapmf', ud2*[-1.7 -1.5 -0.8 -0.7], 'Name', 'NB');

fis = addMF(fis, 'y', 'trimf', ud2*[-0.7 0.0 0.7], 'Name', 'ZR');

fis = addMF(fis, 'y', 'trimf', ud2*[-0.8 -0.7 0.0], 'Name', 'NS');

fis = addMF(fis, 'y', 'trimf', ud2*[ 0.0 0.7 0.8], 'Name', 'PS');

fis = addMF(fis, 'y', 'trapmf', ud2*[ 0.7 0.8 1.3 1.5], 'Name', 'PB');

% Fuzzy Output

udo = 1; % universe of discourse for output

fis = addOutput(fis, [-udo +udo], 'Name', 'u');

fis = addMF(fis, 'u', 'trapmf', udo*[-1.5 -1.4 -0.8 -0.7], 'Name', 'NB');

fis = addMF(fis, 'u', 'trimf', udo*[-0.7 0.0 0.7], 'Name', 'ZR');

fis = addMF(fis, 'u', 'trapmf', udo*[ 0.7 0.8 1.28 1.52], 'Name', 'PB');

fis = addMF(fis, 'u', 'trimf', udo*[-0.8 -0.7 0.0], 'Name', 'NS');

fis = addMF(fis, 'u', 'trimf', udo*[ 0.0 0.7 0.8 ], 'Name', 'PS');

% Fuzzy Rules

rules = [

1 1, 1 1 1

1 3, 1 1 1

1 2, 1 1 1

1 4, 4 1 1

1 5, 2 1 1

2 1, 1 1 1

2 3, 1 1 1

2 2, 1 1 1

2 4, 2 1 1

2 5, 5 1 1

3 1, 1 1 1

3 3, 4 1 1

3 2, 2 1 1

3 4, 5 1 1

3 5, 3 1 1

4 1, 4 1 1

4 3, 2 1 1

4 2, 5 1 1

4 4, 3 1 1

4 5, 3 1 1

5 1, 2 1 1

5 3, 5 1 1

5 2, 3 1 1

5 4, 3 1 1

5 5, 3 1 1

];

fis = addRule(fis, rules);

%% Plots

figure(1)

subplot(211)

plotmf(fis, 'input', 1, 2001), grid on,

xlabel('Input x (Error)')

title('Membership Functions')

subplot(212)

plotmf(fis, 'input', 2, 2001), grid on,

xlabel('Input y (Derivative of Error)')

title('Membership Functions')

figure(2)

plotmf(fis, 'output', 1, 2001), grid on,

xlabel('Output, u')

title('Membership Functions')

figure(3)

opt = gensurfOptions('NumGridPoints', 51);

gensurf(fis, opt);

title('Control Surface')

%% Evaluation

input_x_value = 0.5;

input_y_value = -1.77138;

out = evalfis(fis, [input_x_value, input_y_value])

Warning: Input 2 expects a value in range [-1 1], but has a value of -1.77138.

Warning: No rules fired for Output 1. Defuzzified output value set to its mean range value 0.

out = 0

shilpam malik 2025-7-28

Whenever i tried changing the range again same error comes.

eg. if i change [-2,2] operating range is beyond [-2,2] value comes out 2.78.

if i chnge the the operating range to [-5,5] again the value goes out of range.

Sam Chak 2025-7-28

在 MATLAB Online 中打开

Good, @shilpam malik! This represents another step forward. We can explore other approaches. If you have the mathematical model of the system in Simulink, whether in State-space or Transfer Function form, please provide it here. I can reconstruct it to investigate the fuzzy control issue.

The following examples will give you an idea of how the mathematical model appears:

State-space model (generally described using 4 matrices, A, B, C, D):

sys = rss(2)
sys =
 
  A = 
           x1      x2
   x1  -3.249   1.165
   x2  0.7234  -2.291
 
  B = 
           u1
   x1  -1.079
   x2  0.4604
 
  C = 
            x1       x2
   y1  -0.2372    1.081
 
  D = 
       u1
   y1   0
 
Continuous-time state-space model.

Transfer function model (generally described as a rational function, which is a ratio of two polynomials):

Gp  = tf(sys)
Gp =
 
    0.7536 s + 1.232
  --------------------
  s^2 + 5.54 s + 6.601
 
Continuous-time transfer function.

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having error while running fuzzy controller and fuzzy set of matlab 2017 in matlab 2023?

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having error while running fuzzy controller and fuzzy set of matlab 2017 in matlab 2023?

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