fmincon examples

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diff --git a/tests/general_tests/fmincon/fmincon_logical20.sce b/tests/general_tests/fmincon/fmincon_logical20.sce
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+// Example with log objective function, inequality constraints and non linear constraints
+
+function y=fun(x)
+   y = sum(log(x))
+endfunction
+
+x0 = repmat(1,1,3);
+lb = repmat(0,1,3);
+ub = repmat(10,1,3);
+
+A=[-1,-5,-3;];
+b=[-100]';
+
+function [c,ceq]=nlc(x)
+c = [log(x(1)) + log(x(2)) + log(x(3)) + 1];
+ceq = [];
+endfunction
+
+[xopt,fopt,exitflag,output,lambda,gradient,hessian] = fmincon (fun, x0,A,b,[],[],lb,ub)