Changes between Version 3 and Version 4 of Ticket #18688


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Timestamp:
06/26/15 22:40:35 (6 years ago)
Author:
mkoeppe
Comment:

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  • Ticket #18688 – Description

    v3 v4  
    33#18685 adds the necessary backend functions for the GLPK backend.
    44#18763 adds the necessary backend functions for the COIN (CBC/CLP) backend.
    5 This kind of information is available in every (simplex method based) solver.
     5This kind of information is available in most (simplex method based) solvers. (Exceptions: ppl does not seem to have a public interface to anything simplex tableau related.)
    66
    77The Sage interface should, of course, be designed to work consistently across all solvers. There are some subtleties here -- not all solvers mean the same thing with "at-lower" for cases such as ranged constraints. Best to look at a source that has already sorted it all out: In the COIN open solver interface, [https://projects.coin-or.org/Osi/browser/trunk/Osi/src?order=name] the function is called [https://projects.coin-or.org/Osi/browser/trunk/Osi/src/Osi/OsiSolverInterface.hpp#L1811 getBasisStatus]