Cplex and CBC are giving completely different results on this one. I don't think this problem is infeasible or unbounded - so I think it might be a CBC bug.<br><br><a href="http://coral.ie.lehigh.edu/~magh/tmp/subProb.n0.c0.p3.b2.lp">http://coral.ie.lehigh.edu/~magh/tmp/subProb.n0.c0.p3.b2.lp</a><br>
<br><br><br>Problem 'subProb.n0.c0.p3.b2.lp' read.<br>Read time = 0.00 sec.<br>CPLEX> opt<br>Tried aggregator 1 time.<br>MIP Presolve eliminated 290 rows and 843 columns.<br>Reduced MIP has 3 rows, 3 columns, and 6 nonzeros.<br>
Presolve time = 0.00 sec.<br>Clique table members: 1.<br>MIP emphasis: balance optimality and feasibility.<br>Root relaxation solution time = 0.00 sec.<br><br>MIP - Integer optimal solution: Objective = -7.4380291900e+03<br>
Solution time = 0.00 sec. Iterations = 0 Nodes = 0<br><br><br><br><br><br><br><br>Coin Cbc and Clp Solver version 2.30.00, build Dec 1 2008<br>command line - ./bin/cbc /users/magala/subProb.n0.c0.p3.b2.lp (default strategy 1)<br>
### WARNING: CoinLpIO::readLp(): Variable x(1) does not appear in objective function or constraints<br>### WARNING: CoinLpIO::readLp(): Variable x(7) does not appear in objective function or constraints<br>### WARNING: CoinLpIO::readLp(): Variable x(133) does not appear in objective function or constraints<br>
### WARNING: CoinLpIO::readLp(): Variable x(139) does not appear in objective function or constraints<br>### WARNING: CoinLpIO::readLp(): Variable x(145) does not appear in objective function or constraints<br>### WARNING: CoinLpIO::readLp(): Variable x(151) does not appear in objective function or constraints<br>
### WARNING: CoinLpIO::readLp(): Variable x(157) does not appear in objective function or constraints<br>### WARNING: CoinLpIO::readLp(): Variable x(163) does not appear in objective function or constraints<br>### WARNING: CoinLpIO::readLp(): Variable x(169) does not appear in objective function or constraints<br>
### WARNING: CoinLpIO::readLp(): Variable x(175) does not appear in objective function or constraints<br>### WARNING: CoinLpIO::readLp(): Variable x(393) does not appear in objective function or constraints<br>### WARNING: CoinLpIO::readLp(): Variable x(396) does not appear in objective function or constraints<br>
### WARNING: CoinLpIO::readLp(): Variable x(409) does not appear in objective function or constraints<br>### WARNING: CoinLpIO::readLp(): Variable x(472) does not appear in objective function or constraints<br>### WARNING: CoinLpIO::readLp(): Variable x(487) does not appear in objective function or constraints<br>
Coin0508I Presolve thinks problem is unbounded<br>Continuous objective value is -1.16003e+14 - 0.00 seconds<br>Coin0508I Presolve thinks problem is unbounded<br>Cgl0000I Cut generators found to be infeasible!<br>Pre-processing says infeasible or unbounded<br>
Total time 0.02<br><br>