1#   Problem : Textbook problem used in DAKOTA testing
2#             Constrained quartic, 2 continuous variables
3#   Solution: x=(0.5, 0.5), obj = .125, c1 = 0, c2 = 0
4#
5
6# continuous variables
7var x1 >=  0.5 <= 5.8 := 0.9;
8var x2 >= -2.9 <= 2.9 := 1.1;
9
10# objective function
11minimize obj: (x1 - 1)^4 + (x2 - 1)^4;
12
13# constraints (current required syntax for DAKOTA/AMPL interface)
14minimize c1: x1^2 - 0.5*x2;
15minimize c2: x2^2 - 0.5*x1;
16
17# required for output of *.row and *.col files
18option auxfiles rc;
19