Error with Fmincon nonlinear constraint
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Hi! I encounter a problem trying to use fmincon to solve a nonlinear equation system. The message error:
Error in Untitled (line 12)
F=@(n) [n(1) + n(2) + n(3) + n(4) + n(5) + n(6) + n(7) + n(8) + w - n(9);...
Error in fmincon (line 639)
[ctmp,ceqtmp] = feval(confcn{3},X,varargin{:});
Error in Untitled (line 28)
n=fmincon(@(x)0,x0,[],[],[],[],lb,ub,[[],F],opts);
Caused by:
Failure in initial nonlinear constraint function evaluation. FMINCON cannot continue.
Hereunder you can find a simplified version of my code that returns that error as well. This being the first time I use fmincon, I assume I made a basic syntax error, can anyone help me with this?
nIt = 1;
for ii=1:nIt
% K01 = ;
% K02 = ;
% K03 = ;
% K04 = ;
%
% a = ; b = ; c = ;
% u = ; v = ; w = ; x = ; y = ; z = ;
F=@(n) [n(1) + n(2) + n(3) + n(4) + n(5) + n(6) + n(7) + n(8) + w - n(9);...
1 - (n(3) * n(2) / (n(1) * n(4)))/K01;...
1 - (n(7) / (n(8) * n(6)) * n(9) / u)/K02;...
1 - (n(2) / (n(5) * n(6)) * n(9) / u)/K03;...
1 - (n(6)^2 / n(4) * u / n(9))/K04;...
a*x - n(1) - n(3);...
4*(c) + a*y - 2*n(2) - 2*n(4) - n(5) - n(6) - n(7);...
c - n(7) - n(8);...
4*(c) + a*z - 2*n(1) - n(2) - n(3) - n(5) - 3*v];
lb = zeros(1,9); % Lower bound constraint
ub = 10*ones(1,9); %upper bound constraints
rng default % Reproducible initial point
x0 = exprnd(1,9); %initial values
opts = optimoptions(@fmincon,'Algorithm','interior-point','Display','off');
n=fmincon(@(x)0,x0,[],[],[],[],lb,ub,[[],F],opts);
end
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Accepted Answer
Alan Weiss
on 30 Mar 2020
2 Comments
Alan Weiss
on 30 Mar 2020
Since it helped, please "accept" the answer.
Alan Weiss
MATLAB mathematical toolbox documentation
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