Hock-Schittkowski 268 (constrained) ndo condor AMPL = 0; subject to cons2: 10*x[1]+10*x[2]-3*x[3]+5*x[4]+4*x[5] -20 >= 0; subject to cons3: -8*x[1]+x[2]-2*x[3]-5*x[4]+3*x[5] + 40 >= 0; subject to cons4: 8*x[1]-x[2]+2*x[3]+5*x[4]-3*x[5] -11>= 0; subject to cons5: -4*x[1]-2*x[2]+3*x[3]-5*x[4]+x[5] +30>= 0; ]]> param B:= 1 -9170 2 17099 3 -2271 4 -4336 5 -43; param D: 1 2 3 4 5:= 1 10197 -12454 -1013 1948 329 2 -12454 20909 -1733 -4914 -186 3 -1013 -1733 1755 1089 -174 4 1948 -4914 1089 1515 -22 5 329 -186 -174 -22 27; Source: problem #268 in: K. Schittkowski "More Test Examples for Nonlinear Programming Codes" Springer Verlag, Berlin, Lecture notes in economics and mathematical systems, volume 282, 1987 AMPL Model by Hande Y. Benson