Originally posted by: SystemAdmin

[carali said:]

hello,everyone
  I have a question,Thank you for your suggestion!
  I define a variable X as follows
  TwoDVarMatrix X(env,nbNodes);
  for(i = 0; i < nbNodes; i++)<br />  {
    X[i]=IloNumVarArray(env,nbNodes,0,1, ILOINT);
  }
  but the solution X[3][2]=-0,why ?Is the solution right? How to avoid this?Thank you very much!
#CPLEXOptimizers
#DecisionOptimization

Originally posted by: SystemAdmin

[prubin said:]

[quote author=carali link=topic=1237.msg3497#msg3497 date=1246348874]
  but the solution X[3][2]=-0,why ?Is the solution right? How to avoid this?Thank you very much!


It's just rounding error; treat the value as 0.  (It came out -epsilon for some very small epsilon > 0.)  The only way to stop this is to get very, very picky about constraint tolerances, which can create problems with the solution process.
#CPLEXOptimizers
#DecisionOptimization

Originally posted by: SystemAdmin

[carali said:]

Thank you very much!
#CPLEXOptimizers
#DecisionOptimization