[Coin-lpsolver] PrimalRanging

[Edwin Straver]

Hi All,

 

I believe that in the code that computes the ValueIncreased and
ValueDecreased, in the PrimalRanging routine the increase/and decrease are
swapped, for the case where the getStatus(iSequence) is isFixed,
atUpperBound, or atLowerBound:

 

So, the current code is:

 

checkPrimalRatios(rowArray_[1],1);

      if (pivotRow_>=0) {

        valueIncrease = theta_;

        sequenceIncrease=pivotVariable_[pivotRow_];

      }

      checkPrimalRatios(rowArray_[1],-1);

      if (pivotRow_>=0) {

        valueDecrease = theta_;

        sequenceDecrease=pivotVariable_[pivotRow_];

      }

 

And I believe this needs to be:

 

checkPrimalRatios(rowArray_[1],-1);

      if (pivotRow_>=0) {

        valueIncrease = theta_;

        sequenceIncrease=pivotVariable_[pivotRow_];

      }

      checkPrimalRatios(rowArray_[1],1);

      if (pivotRow_>=0) {

        valueDecrease = theta_;

        sequenceDecrease=pivotVariable_[pivotRow_];

      }

 

Greetings, Edwin

------------------------------------------------

Edwin Straver

edwin at solver.com

------------------------------------------------

 

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