Question

我的Pyomo模型具有以下约束：

def rule1(model, r, t):
    return model.v[r,t] == 0 if (model.w[r,t] < 0) else model.v[r,t] == 10*model.w[r,t]^1.5

model.r1 = Constraint(model.R, model.T, rule=rule1)

它会引发以下错误消息：

TypeError: Relational expression used in an unexpected Boolean context.

        The inequality expression:
            w[test1,0]  <  0.0
        contains non-constant terms (variables) that were evaluated in an
        unexpected Boolean context at
          File '<ipython-input-311-60394d2f36da>', line 2:
    return model.v[r,t] == 0 if (model.w[r,t] < 0) else model.v[r,t] == 10*model.w[r,t]^1.5

从错误消息中我了解到，由于在表达式中使用了变量model.w，因此发生了错误。目前尚不清楚该如何解决？

model.w的值是在另一个约束中计算的，如下所示（它编译时没有错误）：

def balance_equation(model, r, t):
    if t == 0:
        return Constraint.Skip
    return model.w[r,t] == model.w[r,t-1].value + model.v[r,t] - model.z[r,t].value
model.flow = Constraint(model.R, model.T, rule=balance_equation)

如何解决错误“不等式表达式包含非常数项”？

0 个答案: