test.cppDescription: test.cpp
|
| From: | Neill Clift |
| Subject: | Small program that seems to loop |
| Date: | Fri, 16 Oct 2020 02:39:02 +0000 |
|
Hi, I am running on Windows 10 with VS 2019 16.7.5. I just cut and pasted some old code I had that found minimum values for entries in an addition chain for a small project were I just wanted to know if a system was feasible over the integers. I may have done something wrong (for example I still have a call to set the objective function as a MIN but there is no objective function). I generate the small systems programmatically. Seems to work find for a lot of the generated systems but I found one that doesn’t seem to return from the integer portion. At the top of the code is a symbolic representation of the problem in a comment. I attach this program just in case this is interesting to find a bug etc. Thanks. Neill. GLPK Simplex Optimizer, v4.65 30 rows, 17 columns, 62 non-zeros 0: obj = 0.000000000e+00 inf = 2.800e+01 (28) 18: obj = 0.000000000e+00 inf = 0.000e+00 (0) OPTIMAL LP SOLUTION FOUND GLPK Integer Optimizer, v4.65 30 rows, 17 columns, 62 non-zeros 17 integer variables, none of which are binary Preprocessing... 28 rows, 17 columns, 60 non-zeros 17 integer variables, none of which are binary Scaling... A: min|aij| = 1.000e+00 max|aij| = 2.000e+00 ratio = 2.000e+00 Problem data seem to be well scaled Constructing initial basis... Size of triangular part is 28 Solving LP relaxation... GLPK Simplex Optimizer, v4.65 28 rows, 17 columns, 60 non-zeros 18: obj = 0.000000000e+00 inf = 1.000e+00 (1) 23: obj = 0.000000000e+00 inf = 0.000e+00 (0) OPTIMAL LP SOLUTION FOUND Integer optimization begins... Long-step dual simplex will be used + 23: mip = not found yet >= -inf (1; 0) + 11325: mip = not found yet >= 0.000000000e+00 (8782; 0) + 17611: mip = not found yet >= 0.000000000e+00 (13272; 0) + 22532: mip = not found yet >= 0.000000000e+00 (16787; 0) + 26757: mip = not found yet >= 0.000000000e+00 (19805; 0) + 30527: mip = not found yet >= 0.000000000e+00 (22498; 0) + 33970: mip = not found yet >= 0.000000000e+00 (24957; 0) + 37157: mip = not found yet >= 0.000000000e+00 (27234; 0) + 40148: mip = not found yet >= 0.000000000e+00 (29370; 0) + 42955: mip = not found yet >= 0.000000000e+00 (31375; 0) + 45622: mip = not found yet >= 0.000000000e+00 (33280; 0) Time used: 60.0 secs. Memory used: 15.0 Mb. + 48170: mip = not found yet >= 0.000000000e+00 (35100; 0) + 50604: mip = not found yet >= 0.000000000e+00 (36839; 0) + 52948: mip = not found yet >= 0.000000000e+00 (38513; 0) + 55208: mip = not found yet >= 0.000000000e+00 (40127; 0) + 57387: mip = not found yet >= 0.000000000e+00 (41684; 0) + 59501: mip = not found yet >= 0.000000000e+00 (43194; 0) + 61558: mip = not found yet >= 0.000000000e+00 (44663; 0) + 63552: mip = not found yet >= 0.000000000e+00 (46087; 0) + 65490: mip = not found yet >= 0.000000000e+00 (47471; 0) + 67381: mip = not found yet >= 0.000000000e+00 (48822; 0) + 69228: mip = not found yet >= 0.000000000e+00 (50141; 0) + 71023: mip = not found yet >= 0.000000000e+00 (51424; 0) Time used: 120.0 secs. Memory used: 22.9 Mb. + 72782: mip = not found yet >= 0.000000000e+00 (52680; 0) + 74492: mip = not found yet >= 0.000000000e+00 (53901; 0) + 76167: mip = not found yet >= 0.000000000e+00 (55098; 0) + 77818: mip = not found yet >= 0.000000000e+00 (56277; 0) + 79427: mip = not found yet >= 0.000000000e+00 (57426; 0) + 80997: mip = not found yet >= 0.000000000e+00 (58548; 0) + 82477: mip = not found yet >= 0.000000000e+00 (59605; 0) + 83985: mip = not found yet >= 0.000000000e+00 (60682; 0) + 85422: mip = not found yet >= 0.000000000e+00 (61709; 0) + 86862: mip = not found yet >= 0.000000000e+00 (62737; 0) + 88340: mip = not found yet >= 0.000000000e+00 (63793; 0) … |
test.cpp
Description: test.cpp
| [Prev in Thread] | Current Thread | [Next in Thread] |