#!/bin/env python

# example of loadproblem() that adds a quadratic objective

import xpress as xp

p = xp.problem ()

# fill in a problem with three variables and four constraints

p.loadproblem ("",                 # probname
               ['G','G','E', 'L'], # qrtypes
               [-2.4, -3, 4, 5],   # rhs
               None,               # range
               [3,4,5],            # obj
               [0,2,4,8],          # mstart
               None,               # mnel
               [0,1,2,3,0,1,2,3],  # mrwind
               [1,1,1,1,1,1,1,1],  # dmatval
               [-1,-1,-1],         # lb
               [3,5,8],            # ub
               [0,0,0,1,1,2],      # mqobj1
               [0,1,2,1,2,2],      # mqobj1
               [2,1,1,2,1,2])      # dqe

p.write ("loadedq", "lp")
p.solve ()