* NLP literature problem * Goldstein and Price (1971) VARIABLES x y objval objective function variable; FREE VARIABLES objval; EQUATIONS f Objective function; f .. objval =e=(1+POWER(x+y+1,2)*(19-14*x+3*POWER(x,2)-14*y+6*x*y+3*POWER(y,2)))*(30+POWER(2*x-3*y,2)*(18-32*x+12*POWER(x,2)+48*y-36*x*y+27*POWER(y,2))); * Starting point (global solution) * x.L = 0; * y.L = -1; MODEL test /ALL/; SOLVE test USING NLP MINIMIZING objval;