[Cbc] optimal solution cut off?

[Ashutosh Mahajan]

hi all,
it seems the latest stable version 2.2 is giving a wrong optimal solution
value for the instance neos4. other solvers and version 2.1 show -4.8603e10 as
the optimal but cbc-2.2 shows -4.8331e10. it returns correct solution value if
i turn off twomir cuts.

the logs at mittleman's benchmarking page also seem show the wrong solution
value obtained by cbc:
http://plato.asu.edu/ftp/milpf_logs/CBC/neos4.cbc

--
regards
Ashutosh Mahajan
http://coral.ie.lehigh.edu/~asm4