Question

我尝试使用Pulp和CoinMP.dll设置一个简单的环境来解决线性编程问题。我不能让它发挥作用。有人可以帮忙吗？

当我尝试在这里运行测试的第一件事是我有

Solver pulp.solvers.PULP_CBC_CMD不可用。求解 pulp.solvers.CPLEX_DLL不可用。 Solver pulp.solvers.CPLEX_CMD 不可用。 Solver pulp.solvers.CPLEX_PY不可用。

Solver pulp.solvers.COIN_CMD unavailable.
         Testing zero subtraction
         Testing continuous LP solution
         Testing maximize continuous LP solution
         Testing unbounded continuous LP solution
                 Error in CoinMP it reports Optimal
         Testing Long Names
         Testing repeated Names Traceback (most recent call last):   File "<stdin>", line 1, in <module>   File "D:\Portable Python
2.7.5.1\app\lib\site-packages\pulp-1.5.4-py2.7.egg\pulp\pulp.py", line 2235, in pulpTestAll
    pulpTestSolver(s)   File "D:\Portable Python 2.7.5.1\app\lib\site-packages\pulp-1.5.4-py2.7.egg\pulp\tests.py", line 560, in pulpTestSol r
    t(solver(msg=msg))   File "D:\Portable Python 2.7.5.1\app\lib\site-packages\pulp-1.5.4-py2.7.egg\pulp\tests.py", line 170, in pulpTest014
    pulpTestCheck(prob, solver, [LpStatusOptimal], {x:4, y:-1, z:6, w:0})   File "D:\Portable Python
2.7.5.1\app\lib\site-packages\pulp-1.5.4-py2.7.egg\pulp\tests.py", line 17, in pulpTestChec
    prob.writeLP("debug.lp")   File "D:\Portable Python 2.7.5.1\app\lib\site-packages\pulp-1.5.4-py2.7.egg\pulp\pulp.py", line 1502, in writeLP
    + str(repeated_names)) pulp.constants.PulpError: Repeated variable names in Lp format [('x', 2)]

Answer 1

好的发现了这个问题。 PulpTest014抛出此异常。要修复它，COINMP_DLL应该放在包含抛出异常的所有求解器的数组中（因为COIN_CMD已经存在）

if solver.__class__ in [COIN_CMD, COINMP_DLL, PULP_CBC_CMD, CPLEX_CMD, CPLEX_PY,
        GLPK_CMD, GUROBI_CMD]:
    try:
        pulpTestCheck(prob, solver, [LpStatusOptimal], {x:4, y:-1, z:6, w:0})
    except PulpError:
        #these solvers should raise an error'
        pass

通过TestAll传递。

在windows上使用coinmp.dll

1 个答案: