def test_constraints_management(self):
builder = MPModelBuilder()
x = builder.add_binary_variable("x")
y = builder.add_binary_variable("y")
c1 = builder.add_constraint(5.0 * x + 3.0 * y <= 7, "c1")
self.assert_equal(1, builder.get_num_constraints())
self.assert_true(set([id(var) for var in c1.get_variables()]) ==
set([id(x), id(y)]))
c3 = builder.add_constraint(4.0 * x + 6.0 * y <= 5, "c3")
c2 = builder.add_constraint(2.0 * x + 2.0 * y <= 4, "c2")
self.assert_equal([c1, c3, c2], builder.get_constraints())
def test_build_simple_2x2_model(self):
builder = MPModelBuilder()
x1, x2 = builder.x1(), builder.x2()
builder.set_objective(2 * x1 + 3 * x2)
builder.set_constraints([4 * x1 + 6 * x2 <= 5,
2 * x1 + 2 * x2 <= 4])
for constraint in builder.get_constraints():
self.assert_equal(set([id(var) for var in constraint.get_variables()]),
set([id(x1), id(x2)]))
self.assert_equal(2, builder.get_num_variables())
self.assert_equal(2, builder.get_num_constraints())
for var in builder.get_variables():
var.set_type(MPVariable.BINARY)
self.assert_true(builder.is_binary())
