qpipopt_mat added

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diff --git a/demos/qpipopt_mat.dem.sce b/demos/qpipopt_mat.dem.sce
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+mode(1)
+//
+// Demo of qpipopt_mat.sci
+//
+
+//Find x in R^6 such that:
+halt()   // Press return to continue
+ 
+Aeq= [1,-1,1,0,3,1;
+-1,0,-3,-4,5,6;
+2,5,3,0,1,0];
+beq=[1; 2; 3];
+A= [0,1,0,1,2,-1;
+-1,0,2,1,1,0];
+b = [-1; 2.5];
+lb=[-1000; -10000; 0; -1000; -1000; -1000];
+ub=[10000; 100; 1.5; 100; 100; 1000];
+//and minimize 0.5*x'*Q*x + p'*x with
+f=[1; 2; 3; 4; 5; 6]; H=eye(6,6);
+[xopt,fopt,exitflag,output,lambda]=qpipopt_mat(H,f,A,b,Aeq,beq,lb,ub)
+clear H f A b Aeq beq lb ub;
+halt()   // Press return to continue
+ 
+//Find the value of x that minimize following function
+// f(x) = 0.5*x1^2 + x2^2 - x1*x2 - 2*x1 - 6*x2
+// Subject to:
+// x1 + x2 ≤ 2
+// –x1 + 2x2 ≤ 2
+// 2x1 + x2 ≤ 3
+// 0 ≤ x1, 0 ≤ x2.
+H = [1 -1; -1 2];
+f = [-2; -6];
+A = [1 1; -1 2; 2 1];
+b = [2; 2; 3];
+lb = [0; 0];
+ub = [%inf; %inf];
+[xopt,fopt,exitflag,output,lambda] = qpipopt_mat(H,f,A,b,[],[],lb,ub)
+halt()   // Press return to continue
+ 
+//========= E N D === O F === D E M O =========//