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// Example with objective function and inequality constraints function y=fun(x) y=sum(1/(cos(x))) endfunction x0 = [repmat(1,1,3)]; A=[-1,-5,-3;]; b=[-100]'; lb = repmat(0,1,3); ub = repmat(10,1,3); [xopt,fopt,exitflag,output,lambda,gradient,hessian] = fmincon (fun, x0,A,b,[],[],lb,ub)