[Osi-tickets] [COIN-OR Open Solver Interface] #50: CPLEX Error 1017: Not available for mixed-integer programs.

[COIN-OR Open Solver Interface]

#50: CPLEX Error 1017: Not available for mixed-integer programs.
----------------------+-----------------------------------------------------
 Reporter:  joe       |       Owner:  mjs 
     Type:  defect    |      Status:  new 
 Priority:  critical  |   Milestone:      
Component:  OsiCpx    |     Version:  0.96
 Keywords:            |  
----------------------+-----------------------------------------------------
 This trace comes from the discussion
 [http://groups.google.com/group/optimizationservices/t/96d24e16583ef6a3]


 I tried to solve a pure ILP program with CPLEX and OSSolverService
 (from trunk version one hour ago) but it is resulting in a crash. This
 problem is computed successfully with cbc and symphony. Please find my
 problem computesheet0-problem.osil in google "Files section".

 OSSolverService's output :
 {{{
 Input String =  -solver cplex -osil computesheet0-problem.osil -osrl
 computesheet0-problem.osrl
 Call Text Extra
 Call scan string
 call ossslex
 Found option:  -solver cplex
 Found option:  computesheet0-problem.osil
 Found option:  computesheet0-problem.osrl
 done with call to ossslex
 HERE ARE THE OPTION VALUES:
 OSiL file = computesheet0-problem.osil
 OSrL file = computesheet0-problem.osrl
 Inside FileUtil:getFileAsString and calling inFile
 Inside FileUtil:getFileAsString, file read put into ostringstream
 Inside FileUtil:getFileAsString, convert to a string
 Solver Name = cplex
 Parsing took (seconds): 0
 Start Solve with a Coin Solver
 SOLVER NAME =  cplex
 ILOG CPLEX 10.010, licensed to "Joe", options: e m b q use=10
 CREATING A NEW OPTIMIZATION SOLUTION
 Tried aggregator 5 times.
 MIP Presolve eliminated 170 rows and 70 columns.
 MIP Presolve modified 1292 coefficients.
 Aggregator did 1552 substitutions.
 Reduced MIP has 162 rows, 268 columns, and 739 nonzeros.
 Presolve time =    0.03 sec.
 Clique table members: 59.
 MIP emphasis: balance optimality and feasibility.
 Root relaxation solution time =    0.01 sec.
 CPLEX Error  1017: Not available for mixed-integer programs.
 ERROR: CPXgetpi returned error 1017 (getRowPrice in
 OsiCpxSolverInterface)
 terminate called after throwing an instance of 'CoinError
 }}}

 Finally, i've checked in <cplex.h> header file :
 {{{
 #define CPXERR_NOT_FOR_MIP            1017
 }}}

 For my purpose, I've made a quick and dirty fix for my OS/Osi sources.
 I'm not sure this would be usefull for anyone else. Please find this
 ugly patch for the trunk :

 {{{
 Index: /local/joe/20080218/OS/OS1.1/Osi/src/OsiCpx/
 OsiCpxSolverInterface.cpp
 ===================================================================
 --- /local/joe/20080218/OS/OS1.1/Osi/src/OsiCpx/
 OsiCpxSolverInterface.cpp       (revision 1188)
 +++ /local/joe/20080218/OS/OS1.1/Osi/src/OsiCpx/
 OsiCpxSolverInterface.cpp       (working copy)
 @@ -1237,6 +1237,7 @@
    return colsol_;
  }
  //------------------------------------------------------------------
 +
  const double * OsiCpxSolverInterface::getRowPrice() const
  {
    debugMessage("OsiCpxSolverInterface::getRowPrice()\n");
 @@ -1248,7 +1249,7 @@
         {
           rowsol_ = new double[nrows];
           int err = CPXgetpi( env_, getMutableLpPtr(), rowsol_, 0,
 nrows-1 );
 -         if ( err == CPXERR_NO_SOLN )
 +         if ( err == CPXERR_NO_SOLN || err == CPXERR_NOT_FOR_MIP )
             CoinFillN( rowsol_, nrows, 0.0 );
           else
             checkCPXerror( err, "CPXgetpi", "getRowPrice" );
 @@ -1268,7 +1269,7 @@
         {
           redcost_ = new double[ncols];
           int err = CPXgetdj( env_, getMutableLpPtr(), redcost_, 0,
 ncols-1 );
 -         if ( err == CPXERR_NO_SOLN )
 +         if ( err == CPXERR_NO_SOLN || err == CPXERR_NOT_FOR_MIP )
             CoinFillN( redcost_, ncols, 0.0 );
           else
             checkCPXerror( err, "CPXgetdj", "getReducedCost" );
 }}}

-- 
Ticket URL: <https://projects.coin-or.org/Osi/ticket/50>
COIN-OR Open Solver Interface <http://projects.coin-or.org/Osi>
An API for a variety of LP and MIP solvers (and more).