PySCIPOpt/tests/test_variablebounds.py at master · Wenbo11/PySCIPOpt · GitHub

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from pyscipopt import Model


m = Model()

x0 = m.addVar(lb=-5, ub=8)
r1 = m.addVar()
r2 = m.addVar()
y0 = m.addVar(lb=3)
t = m.addVar(lb=None)
z = m.addVar()

m.chgVarLbGlobal(x0, -2)
m.chgVarUbGlobal(x0, 4)

infeas, tightened = m.tightenVarLb(x0, -5)
assert not infeas
assert not tightened
infeas, tightened = m.tightenVarLbGlobal(x0, -1)
assert not infeas
assert tightened
infeas, tightened = m.tightenVarUb(x0, 3)
assert not infeas
assert tightened
infeas, tightened = m.tightenVarUbGlobal(x0, 9)
assert not infeas
assert not tightened
infeas, fixed = m.fixVar(z, 7)
assert not infeas
assert fixed
assert m.delVar(z)

m.addCons(r1 >= x0)
m.addCons(r2 >= -x0)
m.addCons(y0 == r1 +r2)

m.setObjective(t)
m.addCons(t >= r1 * (r1 - x0) + r2 * (r2 + x0))


m.optimize()

print("x0", m.getVal(x0))
print("r1", m.getVal(r1))
print("r2", m.getVal(r2))
print("y0", m.getVal(y0))
print("t", m.getVal(t))