Opened 12 years ago

Closed 3 months ago

#1 closed defect (migrated)

Incorrect Real Option calls causes COIN CLP to mark some problems as infeasible

Reported by: ltaylor Owned by: somebody
Priority: high Milestone:
Component: component1 Version:
Severity: major Keywords:
Cc:

Description

In coinmp.cpp

In function heading

SOLVAPI int CoinOptimizeProblem(HPROB hProb, int Method)

... there are several calls to CoinGetIntOption?? for parameters that are actually Real values. The CoinGetIntOption?? always returns zero for options that are REAL. So those code lines actually will set, e.g., DualObjectiveLimit?? to zero.

DualObjectiveLimit?? should be set high, and the default is 1e+308. When it is zero, CLP will mark some feasible problems as infeasible.

This has been bothering me, as I have been using CoinMP.dll for optimizations, and it can sometimes get the right answer, but return the 'PrimalInfeasible??' message and status.

I would check this change in myself, but I don't have those privileges (yet).

LAT

	pCoin->clp->setPrimalObjectiveLimit(CoinGetRealOption(hProb, COIN_REAL_PRIMALOBJLIM));
	pCoin->clp->setDualObjectiveLimit(CoinGetRealOption(hProb, COIN_REAL_DUALOBJLIM));
	pCoin->clp->setPrimalTolerance(CoinGetRealOption(hProb, COIN_REAL_PRIMALOBJTOL));
	pCoin->clp->setDualTolerance(CoinGetRealOption(hProb, COIN_REAL_DUALOBJTOL));

... skip ...

	pCoin->clp->crash(CoinGetRealOption(hProb, COIN_REAL_CRASHGAP),

Change History (1)

comment:1 Changed 3 months ago by stefan

  • Resolution set to migrated
  • Status changed from new to closed

This ticket has been migrated to GitHub and will be resolved there: https://github.com/coin-or/CoinMP/issues/1

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