Multi-stage amplifier optimization

I have written the following code in order to optimize a 5 stage amplifier, using the fmincon solver, which is contained in the MATLAB Optimization tool, I am also testing the various solution algorithms offered (Interior point, SQP, Active set, Trust region reflective)

There is a problem with my code, my guesses are it is in the second part. If anyone has any idea i would be grateful.

%myfun.m
function D = myfun(A)

%First Part
N0 = 0;
N1 = A(1)*sqrt(N0^2 + 10^-10);
N2 = A(2)*sqrt(N1^2 + 10^-6);
N3 = A(3)*sqrt(N2^2 + 10^-4);
N4 = A(4)*sqrt(N3^2 + 10^-4);
N5 = A(5)*sqrt(N4^2 + 10^-2);
N5 = Nout;

%Second Part
Sin1 = 0.1/A(1);
Sin2 = 3/A(1)*A(2);
Sin3 = 5/A(1)*A(2)*A(3);
Sin4 = 8/A(1)*A(2)*A(3)*A(4));
Sin5 = 12/A(1)*A(2)*A(3)*A(4)*A(5);
smin = min(Sin1,Sin2,Sin3,Sin4,Sin5);

smin = Smax;

D = Smax/Nout;


%mycon.m
function [c,ceq] = mycon(A)

c = [];
ceq (1) = A(1)*A(2)*A(3)*A(4)*A(5) = 10000;

Answer 1

[Alan Weiss]

I didn't try too run your code, but this line is incorrect syntax:

ceq (1) = A(1)*A(2)*A(3)*A(4)*A(5) = 10000;

It should be

ceq = A(1)*A(2)*A(3)*A(4)*A(5) - 10000;

Alan Weiss

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