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2011-03-05 23:01:03 +0200 | commented answer | Sage 4.6.2: how to use CPLEX Thanks. This made some progress. After following the instructions, I get an undefined symbol error in one of the Cbc object files (libCbcSolver.so.0) if I use solver="Coin". I don't mind that, as it's really CPLEX that concerns me. Using solver="CPLEX" works fine in a terminal; I can construct and solve a small test problem. In a notebook, though, lp = MixedIntegerLinearProgram(solver="CPLEX") fails silently -- it produces no output (in the terminal I see a license message from CPLEX), no error message, and lp is considered undefined. |

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2011-03-05 22:16:45 +0200 | marked best answer | Sage 4.6.2: how to use CPLEX In order to use the COIN solver within Sage you have to have the After the to build the new backend module for COIN. Then, you'll be able to run CPLEX is a little trickier, but there is documentation you can find documentation at http://www.sagemath.org/doc/thematic_tutorials/linear_programming.html#installing-cplex . |

2011-03-05 18:37:01 +0200 | asked a question | Sage 4.6.2: how to use CPLEX I've just upgraded from 4.6 to 4.6.2. The COIN and CPLEX backends were included (in .../devel/sage-main/sage/numerical/backends), but I can't find a way to import them. The line works, but solver="Coin" and solver="CPLEX" lead to messages that the corresponding _backend module is not found. I tried a few blind guesses to import them but had not luck. The docs seem to be a lap behind (the help for MixedIntegerLinearProgram says the CPLEX interface is not implemented yet, but that COIN's is; on the other hand, asking for help for sage.numerical.backends.xxxx_backend works for xxxx=glpk but not for xxxx=coin or cplex). Does anybody know the correct incantation? TIA, Paul |

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