How to call sigmoid function inside runge kutte orde 4? Is it possibel?

I have sigmoid function and I want to call that function with runge kutte, how to call function inside function?

Answer 1

[Image Analyst]

To call a function from within another function, just call the function by name and pass it the arguments it wants. For example, to have it call a function called "function2" inside another function called "function1", do this:

function function1()
    output = function2(input1, input2, input3);
end

Make sure you give the "inside" function whatever arguments it needs.

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[cindyawati cindyawati]

Thanks for your response @Image Analyst. But, I already try with another code. I get error like this. What does the error mean?

function S = sigmoid (M1)
    M1(j+1)= M1(j)+1./(1+exp(-T(j)));

    function M1 =fRK4M1(K1,K2,M1,M2,M3,O,P,S)
            M1=10;
            M2=0;
            M3=0;
            O=0;
            P=0;
            Ko=0.1;
            n=3;
            Oa=10;
            Pa=100;
            mu_1=10^-3;
            mu_2=10^-3;
            mu_3=10^-3;
            mu_o=10^-4;
            mu_p= 10^-5;
            K2=5*10^-4;
            K3=10^-3;
            gamma=75;
            delta= 50;
     M1 = (delta*M1*(1-(M1/gamma))-2*K1*M1*M1-M1*(K2.*M2)-((Oa-n)*K3*M1*M3)-((Pa-Oa)*Ko*M1*O)-(mu_1*M1));
    end 
end
   
  

[Image Analyst]

Why did you not assign values for, and pass the variables in for, K1,K2,M1,M2,M3,O,P,S? Why did you call fRK4M1 with not enough (any actually) input arguments? Did you think MATLAB would just somehow automatically invent values for those variables? It won't. You have to assign them.

What is the name of your m-file? It appears to be fRK4M1.m, which is the name of a nested function. It should be sigmoid.m, which is the outermost function. And you need to assign and pass in M1 when you call sigmoid().