search

coin-or / Cbc.old

This is a mirror of the subversion repository on COIN-OR
https://projects.coin-or.org/Cbc
Other
89 stars 30 forks source link

[Trac #97] CBC version 2.4.2, OSI version 0.102.3 - OsiCbc declares problem infeasible that Cbc solves to optimal fine (tiny problem) #105

Open s-c-e opened 5 years ago

s-c-e commented 5 years ago

image

The code to repeat the issue can be found in DIP repository at bugs/OsiCbc.

[magala@orclus71 OsiCbc]$ ./a.out
Clp0000I Optimal - objective value 2
Cbc0009I Objective coefficients multiple of 1
Clp0000I Optimal - objective value 2
Cbc0004I Integer solution of 2 found after 0 iterations and 0 nodes (0.00 seconds)
Cbc0001I Search completed - best objective 2, took 0 iterations and 0 nodes (0.00 seconds)
Cbc0035I Maximum depth 0, 0 variables fixed on reduced cost
Clp0000I Optimal - objective value 2
Clp0000I Optimal - objective value 2
Clp0006I 0  Obj 2.57476 Dual inf 0.10562 (1)
Clp0006I 2  Obj 2.57476
Clp0000I Optimal - objective value 2.57476
Cbc0006I The LP relaxation is infeasible or too expensive
a.out: main.cpp:47: int main(int, char**): Assertion `!osi.isProvenPrimalInfeasible()' failed.
Aborted

To repeat the issue, run this:

​https://projects.coin-or.org/Dip/browser/trunk/Dip/bugs/OsiCbc/main.cpp