[Osi-tickets] Re: [COIN-OR Open Solver Interface] #2: checking solution availability in OsiXprSolverInterface

[COIN-OR Open Solver Interface]

#2: checking solution availability in OsiXprSolverInterface
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  Reporter:  pbonami  |       Owner:  somebody
      Type:  defect   |      Status:  new     
  Priority:  major    |   Milestone:          
 Component:  OsiXpr   |     Version:          
Resolution:           |    Keywords:          
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Comment (by pbonami):

 Replying to [comment:3 mjs]:
 > Replying to [comment:2 mjs]:
 >
 > > Or it could be that what was intended is (pstat & 7) == 7, which would
 mean loaded, LP presolved, and MIP presolved, but validity is ignored.
 >
 > Or even (pstat & 7) == 0 or (pstat & 7) != 0...

 Sorry for not following up earlier.
 The function tries to obtain a basis from XPRESS. I really don't see the
 relation between availability of a basis and the state of LP and MIP
 presolve.

 In any case if there is no valid solution in memory I don't see how a
 basis is available.

 I am not working with that anymore but when I tried to use this function a
 few months ago, I consistently obtained incorrect results.
 Regards,
 Pierre

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Ticket URL: <https://projects.coin-or.org/Osi/ticket/2#comment:4>
COIN-OR Open Solver Interface <http://projects.coin-or.org/Osi>
An API for a variety of LP and MIP solvers (and more).