def test_pulp_123(self):
"""
Test the ability to use Elastic constraints (penalty unbounded)
"""
prob = LpProblem("test123", const.LpMinimize)
x = LpVariable("x", 0, 4)
y = LpVariable("y", -1, 1)
z = LpVariable("z", 0)
w = LpVariable("w")
prob += x + 4 * y + 9 * z + w, "obj"
prob += x + y <= 5, "c1"
prob += x + z >= 10, "c2"
prob += -y + z == 7, "c3"
prob.extend((w >= -1).makeElasticSubProblem(penalty=0.9))
print("\t Testing elastic constraints (penalty unbounded)")
if self.solver.__class__ in [COINMP_DLL, GUROBI, CPLEX_CMD, YAPOSIB, MOSEK]:
# COINMP_DLL Does not report unbounded problems, correctly
pulpTestCheck(
prob, self.solver, [const.LpStatusInfeasible, const.LpStatusUnbounded]
)
elif self.solver.__class__ is GLPK_CMD:
# GLPK_CMD Does not report unbounded problems, correctly
pulpTestCheck(prob, self.solver, [const.LpStatusUndefined])
elif self.solver.__class__ in [CPLEX_DLL, GUROBI_CMD, SCIP_CMD]:
# GLPK_CMD Does not report unbounded problems, correctly
pulpTestCheck(prob, self.solver, [const.LpStatusNotSolved])
elif self.solver.__class__ in [PULP_CHOCO_CMD, CHOCO_CMD]:
# choco bounds all variables. Would not return unbounded status
pass
else:
pulpTestCheck(prob, self.solver, [const.LpStatusUnbounded])
def test_pulp_122(self):
"""
Test the ability to use Elastic constraints (penalty unchanged)
"""
prob = LpProblem("test122", const.LpMinimize)
x = LpVariable("x", 0, 4)
y = LpVariable("y", -1, 1)
z = LpVariable("z", 0)
w = LpVariable("w")
prob += x + 4 * y + 9 * z + w, "obj"
prob += x + y <= 5, "c1"
prob += x + z >= 10, "c2"
prob += -y + z == 7, "c3"
prob.extend((w >= -1).makeElasticSubProblem(penalty=1.1))
print("\t Testing elastic constraints (penalty unchanged)")
pulpTestCheck(prob, self.solver, [const.LpStatusOptimal],
{x: 4, y: -1, z: 6, w: -1.0})
