朱莉娅的UndefVarError

Question

对Julia来说是个新手，并且正在尝试完成一些代码。我一直收到这个错误："ERROR: LoadError: LoadError: UndefVarError：@defVar not defined“。代码的开头在我定义@defVar的地方。Julia版本1.1.1 (2019-05-16)。下面是我使用的代码：

using DataFrames
using GLPKMathProgInterface
using JuMP

num_lineups = 6
num_overlap = 4

path_data = "/users/matt/desktop/example_players.csv"
path_data2 = "/users/matt/desktop/example_players2.csv"
path_to_output= "/users/matt/desktop/output.csv"

m = Model(solver=GLPKSolverMIP())
    @defVar(m, players_a_lineup[i=1:num_players_a], Bin)
    @defVar(m, players_b_lineup[i=1:num_players_b], Bin)

Answer 1

您使用的是旧语法(@defvar已使用到0.12版)。对于最新的Julia/JuMP版本19，您的代码应该是

using DataFrames
using GLPK
using JuMP
...
m = Model(with_optimizer(GLPK.Optimizer))
@variable(m, players_a_lineup[i=1:num_players_a], Bin)
@variable(m, players_b_lineup[i=1:num_players_b], Bin)