/usr/share/pyshared/openopt/examples/miqp_1.py is in python-openopt 0.38+svn1589-1.
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Example:
Concider the problem
0.5 * (x1^2 + 2x2^2 + 3x3^2) + 15x1 + 8x2 + 80x3 -> min (1)
subjected to
x1 + 2x2 + 3x3 <= 150 (2)
8x1 + 15x2 + 80x3 <= 800 (3)
x2 - x3 = 25.5 (4)
x1 <= 15 (5)
x1, x3 are integers
"""
from numpy import diag, matrix, inf
from openopt import QP
p = QP(diag([1, 2, 3]), [15, 8, 80], A = matrix('1 2 3; 8 15 80'), b = [150, 800], Aeq = [0, 1, -1], beq = 25.5, ub = [15,inf,inf])
# or p = QP(H=diag([1,2,3]), f=[15,8,80], A= ...)
r = p.solve('cplex', intVars= [0, 2], iprint = 0)
f_opt, x_opt = r.ff, r.xf
# x_opt = array([-15. , -2.5, -28. ])
# f_opt = -1190.25
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