# AMPL Model by Hande Y. Benson
#
# Copyright (C) 2001 Princeton University
# All Rights Reserved
#
# Permission to use, copy, modify, and distribute this software and
# its documentation for any purpose and without fee is hereby
# granted, provided that the above copyright notice appear in all
# copies and that the copyright notice and this
# permission notice appear in all supporting documentation.                     

#   Source: Six hump camel in
#   L. C. W. Dixon and G. P. Szego (Eds.)
#   Towards Global Optimization
#   North Holland, 1975.

#   SIF input: A.R. Conn May 1995

#   classification OBR2-AN-2-0

var x{1..2} := 1.1;

minimize f:
	4*x[1]^2-2.1*x[1]^4+x[1]^6/3+x[1]*x[2]-4*x[2]^2+4*x[2]^4;
subject to cons1:
	-3 <= x[1] <= 3;
subject to cons2:
	-1.5 <= x[2] <= 1.5;

solve; display f; display x;