abc
2020-12-14 22:19:43
MIP的最佳界限是无限的，因为不存在可行的整数解。
实际上，你的ILP中的所有变量都被限制为通用整数值（“通用”部分）。
这里有一个使用GLPK解决ILP的示例。
15 rows, 10 columns, 25 non-zeros
10 integer variables, none of which are binary
...
Solving LP relaxation...
GLPK Simplex Optimizer, v4.65
5 rows, 10 columns, 15 non-zeros
0: obj = -8.000000000e+00 inf = 1.631e+01 (5)
5: obj = -3.750000000e-01 inf = 0.000e+00 (0)
* 8: obj = 3.000000000e+00 inf = 0.000e+00 (0)
OPTIMAL LP SOLUTION FOUND
Integer optimization begins...
Long-step dual simplex will be used
+ 8: mip = not found yet <= +inf (1; 0)
+ 8: mip = not found yet <= tree is empty (0; 3)
PROBLEM HAS NO INTEGER FEASIBLE SOLUTION
Time used: 0.0 secs
Memory used: 0.1 Mb (63069 bytes)
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