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sos.py
#!/usr/bin/env python3.7 # Copyright 2021, Gurobi Optimization, LLC # This example creates a very simple Special Ordered Set (SOS) model. # The model consists of 3 continuous variables, no linear constraints, # and a pair of SOS constraints of type 1. import gurobipy as gp from gurobipy import GRB try: # Create a new model model = gp.Model("sos") # Create variables x0 = model.addVar(ub=1.0, name="x0") x1 = model.addVar(ub=1.0, name="x1") x2 = model.addVar(ub=2.0, name="x2") # Set objective model.setObjective(2 * x0 + x1 + x2, GRB.MAXIMIZE) # Add first SOS: x0 = 0 or x1 = 0 model.addSOS(GRB.SOS_TYPE1, [x0, x1], [1, 2]) # Add second SOS: x0 = 0 or x2 = 0 model.addSOS(GRB.SOS_TYPE1, [x0, x2], [1, 2]) model.optimize() for v in model.getVars(): print('%s %g' % (v.varName, v.x)) print('Obj: %g' % model.objVal) except gp.GurobiError as e: print('Error code ' + str(e.errno) + ": " + str(e)) except AttributeError: print('Encountered an attribute error')