How to get inputs from outputs in fuzzy interface system?

is it possible in FIS to get inputs from ouyputs? for example my inputs are a=100,b=60,c=80 and output is 55.can i get inputs for output value=65?

Answer 1

[Sam Chak]

Hi @amir

There is no built-in function in the Fuzzy Logic Toolbox to accomplish this. Moreover, if the fuzzy inference system (FIS) can indeed produce a specified output, there may be unlimited combinations of inputs in the output manifold that yield exactly that output.

The task is somewhat analogous to solving a system of nonlinear equations; however, the FIS represents only a single nonlinear manifold equation. Therefore, the problem constitutes an underdetermined system.

x1  = (20:0.01:50)';
x2  = x1;
y   = x1 + x2;
data= [x1, x2, y];
opt = anfisOptions("DisplayANFISInformation", 0, "DisplayErrorValues", 0, "DisplayStepSize", 0, "DisplayFinalResults", 0);
fis = anfis(data, opt);

out1= evalfis(fis, [20.0 45.0])

out1 = 65.0000

out2= evalfis(fis, [25.0 40.0])

out2 = 65.0000

out3= evalfis(fis, [30.0 35.0])

out3 = 65.0000

out4= evalfis(fis, [32.5 32.5])

out4 = 65.0000

out5= evalfis(fis, [35.0 30.0])

out5 = 65.0000

out6= evalfis(fis, [40.0 25.0])

out6 = 65.0000

out7= evalfis(fis, [45.0 20.0])

out7 = 65.0000

gensurf(fis)
xlabel('x1'), ylabel('x2'), zlabel('y')