LoadError: UndefVarError：@defVar未定义

Question

我有一段关于JuMP的代码。当我运行它时，它显示没有定义LoadError: UndefVarError：@defVar。我尝试使用全局向前或向后，但都失败了。

请参见：

function T1(w_func,grid_b,β,u,z)
            # objective for each grid point
                for j in 1:cp.Nb
                b = grid_b[j]
                choice1 = Model(solver=GLPKSolverLP()) 
                @defVar (choice1, a >= 0)
                @setObjective(choice1, Max, u(a) + cp.β * (w_func.((b*(1+cp.r)+cp.w-a) .* cp.z[i])))
                results1 = solve(choice1)
                Tw1 = getObjectiveValue(choice1)
                c_choice1 = getValue(x)
                return Tw, σ
                end
            end      

LoadError: UndefVarError: @defVar not defined
in expression starting at In[44]:37

Stacktrace:
 [1] top-level scope
   @ :0
 [2] eval
   @ ./boot.jl:360 [inlined]
 [3] include_string(mapexpr::typeof(REPL.softscope), mod::Module, code::String, filename::String)
   @ Base ./loading.jl:1094

thanks

Answer 1

看起来你使用的是过时的代码。查看fresh documentation，并确保安装了最新版本的库和Julia。

简而言之，@defVar和@setObjective相应地被@variable和@objective所取代。

function T1(w_func,grid_b,β,u,z)
    # objective for each grid point
    for j in 1:cp.Nb
        b = grid_b[j]
        choice1 = Model(solver=GLPKSolverLP()) 
        @variable(choice1, a >= 0)
        @objective(choice1, Max, u(a) + cp.β * (w_func.((b*(1+cp.r)+cp.w-a) .* cp.z[i])))
        results1 = solve(choice1)
        Tw1 = getObjectiveValue(choice1)
        c_choice1 = getValue(x)
        return Tw, σ
    end
end