Changes between Initial Version and Version 2 of Ticket #18733
 Timestamp:
 06/20/15 06:55:59 (6 years ago)
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Ticket #18733

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PLEASE CHANGE
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Ticket #18733 – Description
initial v2 1 If one uses Sage's MixedIntegerLinearProgramclass for solving an LP, it is useful to access dictionary (tableau) data corresponding to the current (often optimal) basis. For example, one needs this to compute tableau cutting planes such as Gomory's fractional cut.1 If one uses Sage's `MixedIntegerLinearProgram` class for solving an LP, it is useful to access dictionary (tableau) data corresponding to the current (often optimal) basis. For example, one needs this to compute tableau cutting planes such as Gomory's fractional cut. 2 2 3 3 The Sage interface should, of course, be designed to work consistently across all solvers. There are some subtleties here. Best to be compatible with a library that has already sorted most of it out: In the COIN open solver interface, there are the functions [https://projects.coinor.org/Osi/browser/trunk/Osi/src/Osi/OsiSolverInterface.hpp#L1860 getBInvARow], getBInvRow, getBInvACol, getBInvCol.