$ontext Data for QP with unique solution The problem is set up so: - g_1 is binding and g_2 is not - x_2.up and x_3.lo are are binding - x_1 and x_4 are basic/superbasic at solution $offtext set j / j1 * j4 /; set i / i1 * i2 /; alias(j,jj); parameters c(j) / j1 4 j2 -9 j3 6 j4 2 / b(i) / i1 1 i2 1 /; table Q(j,jj) j1 j2 j3 j4 j1 4 -2 -1 -1 j2 -2 4 -2 -1 j3 -1 -2 4 -2 j4 -1 -1 -2 4 ; table A(i,j) j1 j2 j3 j4 i1 1 1 i2 1 1 1 ; positive variable x(j); free variable z; equation g(i), o; g(i) .. sum {j, A(i,j)*x(j)} =G= b(i); o .. 0.5 * sum {j, x(j)*sum{jj, Q(j,jj)*x(jj)}} + sum{j, c(j)*x(j)} =E= z; x.up(j) = 20; x.up('j2') = 2; model mqp / g, o /; * solve mqp using nlp min z;