Python Model.delVar Beispiele

Beispiel #1

Datei: test_variablebounds.py Projekt: zhuanglineu/PySCIPOpt

def test_variablebounds():

    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))

Beispiel #2

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))

Beispiel #3

Datei: test_variablebounds.py Projekt: SCIP-Interfaces/PySCIPOpt

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))