Question

我尝试运行以下代码块：

template <typename T>
Dog::Dog(const T &name) : _name(name) {} 
// if T is only copyable, then it will be copied once
// if T is only movable, it results in compilation error (conclusion: define separate move constructor)
// if T is both copyable and movable, it results in one copy

template <typename T>
Dog::Dog(T name) : _name(std::move(name)) {}
// if T is only copyable, then it results in 2 copies
// if T is only movable, and you called Dog(std::move(name)), it results in 2 moves
// if T is both copyable and movable, it results in one copy, then one move.

我收到以下错误：

using JuMP
using CPLEX  
function solveRMP(cust::Int64,
  routes::Array{Float64,2},
  routeCost::Array{Float64,1},
  m::Int64)

  cust_dep = cust+2;

  rmp = Model(solver = CplexSolver())
  # Add decistion variables
  @variable(rmp, 0<=x[1:size(routes,2)])
  #
  # Add objective
  @objective(rmp, Min, sum(routeCost[r]*x[r] for r=1:size(routes,2)))
  # #####################
  # ### Constraints
  @constraint(rmp, cVisitCust[i=2:cust_dep-1], sum(routes[i,r]*x[r] for r=1:size(routes,2)) == 1)
  @constraint(rmp, cMaxNrRoutes, sum(x[r] for r=1:size(routes,2)) <= m )

  allConstraints = vcat(cVisitCust,cMaxNrRoutes)


  writeLP(rmp, "myRMP.lp", genericnames=false);


  solve(rmp)
  duals = zeros(1,1)
  append!(duals,getdual(allConstraints))

  return  getvalue(x), duals 
end

Answer 1

在变量x的声明中，

@variable(rmp, 0<=x[1:size(routes,2)])

约束需要位于变量名称的右侧

@variable(rmp, x[1:size(routes,2)] >= 0)

否则0被解释为变量名称，导致错误。

LoadError：MethodError：没有匹配getname（:: Int64）的方法

1 个答案: