/* $Id: ClpPlusMinusOneMatrix.cpp 1458 2009-11-05 12:34:07Z forrest $ */
// Copyright (C) 2003, International Business Machines
// Corporation and others.  All Rights Reserved.


#include <cstdio>

#include "CoinPragma.hpp"
#include "CoinIndexedVector.hpp"
#include "CoinPackedVector.hpp"
#include "CoinHelperFunctions.hpp"

#include "ClpSimplex.hpp"
#include "ClpFactorization.hpp"
// at end to get min/max!
#include "ClpPlusMinusOneMatrix.hpp"
#include "ClpMessage.hpp"

//#############################################################################
// Constructors / Destructor / Assignment
//#############################################################################

//-------------------------------------------------------------------
// Default Constructor 
//-------------------------------------------------------------------
ClpPlusMinusOneMatrix::ClpPlusMinusOneMatrix () 
  : ClpMatrixBase()
{
  setType(12);
  matrix_ = NULL;
  startPositive_ = NULL;
  startNegative_ = NULL;
  lengths_=NULL;
  indices_=NULL;
  numberRows_=0;
  numberColumns_=0;
  columnOrdered_=true;
}

//-------------------------------------------------------------------
// Copy constructor 
//-------------------------------------------------------------------
ClpPlusMinusOneMatrix::ClpPlusMinusOneMatrix (const ClpPlusMinusOneMatrix & rhs) 
: ClpMatrixBase(rhs)
{  
  matrix_ = NULL;
  startPositive_ = NULL;
  startNegative_ = NULL;
  lengths_=NULL;
  indices_=NULL;
  numberRows_=rhs.numberRows_;
  numberColumns_=rhs.numberColumns_;
  columnOrdered_=rhs.columnOrdered_;
  if (numberColumns_) {
    CoinBigIndex numberElements = rhs.startPositive_[numberColumns_];
    indices_ = new int [ numberElements];
    CoinMemcpyN(rhs.indices_,numberElements,indices_);
    startPositive_ = new CoinBigIndex [ numberColumns_+1];
    CoinMemcpyN(rhs.startPositive_,(numberColumns_+1),startPositive_);
    startNegative_ = new CoinBigIndex [ numberColumns_];
    CoinMemcpyN(rhs.startNegative_,numberColumns_,startNegative_);
  }
  int numberRows = getNumRows();
  if (rhs.rhsOffset_&&numberRows) {
    rhsOffset_ = ClpCopyOfArray(rhs.rhsOffset_,numberRows);
  } else {
    rhsOffset_=NULL;
  }
}
// Constructor from arrays
ClpPlusMinusOneMatrix::ClpPlusMinusOneMatrix(int numberRows, int numberColumns,
					     bool columnOrdered, const int * indices,
					     const CoinBigIndex * startPositive, 
					     const CoinBigIndex * startNegative)
  : ClpMatrixBase()
{
  setType(12);
  matrix_ = NULL;
  lengths_=NULL;
  numberRows_=numberRows;
  numberColumns_=numberColumns;
  columnOrdered_=columnOrdered;
  int numberMajor = (columnOrdered_) ? numberColumns_ : numberRows_;
  int numberElements = startPositive[numberMajor];
  startPositive_ = ClpCopyOfArray(startPositive,numberMajor+1);
  startNegative_ = ClpCopyOfArray(startNegative,numberMajor);
  indices_ = ClpCopyOfArray(indices,numberElements);
  // Check valid
  checkValid(false);
}

ClpPlusMinusOneMatrix::ClpPlusMinusOneMatrix (const CoinPackedMatrix & rhs) 
  : ClpMatrixBase()
{  
  setType(12);
  matrix_ = NULL;
  startPositive_ = NULL;
  startNegative_ = NULL;
  lengths_=NULL;
  indices_=NULL;
  int iColumn;
  assert (rhs.isColOrdered());
  // get matrix data pointers
  const int * row = rhs.getIndices();
  const CoinBigIndex * columnStart = rhs.getVectorStarts();
  const int * columnLength = rhs.getVectorLengths(); 
  const double * elementByColumn = rhs.getElements();
  numberColumns_ = rhs.getNumCols();
  numberRows_=-1;
  indices_ = new int[rhs.getNumElements()];
  startPositive_ = new CoinBigIndex [numberColumns_+1];
  startNegative_ = new CoinBigIndex [numberColumns_];
  int * temp = new int [rhs.getNumRows()];
  CoinBigIndex j=0;
  CoinBigIndex numberGoodP=0;
  CoinBigIndex numberGoodM=0;
  CoinBigIndex numberBad=0;
  for (iColumn=0;iColumn<numberColumns_;iColumn++) {
    CoinBigIndex k;
    int iNeg=0;
    startPositive_[iColumn]=j;
    for (k=columnStart[iColumn];k<columnStart[iColumn]+columnLength[iColumn];
	 k++) {
      int iRow;
      if (fabs(elementByColumn[k]-1.0)<1.0e-10) {
	iRow = row[k];
	numberRows_ = CoinMax(numberRows_,iRow);
	indices_[j++]=iRow;
        numberGoodP++;
      } else if (fabs(elementByColumn[k]+1.0)<1.0e-10) {
	iRow = row[k];
	numberRows_ = CoinMax(numberRows_,iRow);
	temp[iNeg++]=iRow;
        numberGoodM++;
      } else {
        numberBad++;
      }
    }
    // move negative
    startNegative_[iColumn]=j;
    for (k=0;k<iNeg;k++) {
      indices_[j++] = temp[k];
    }
  }
  startPositive_[numberColumns_]=j;
  delete [] temp;
  if (numberBad) {
    delete [] indices_;
    indices_=NULL;
    numberRows_=0;
    numberColumns_=0;
    delete [] startPositive_;
    delete [] startNegative_;
    // Put in statistics
    startPositive_ = new CoinBigIndex [3];
    startPositive_[0]=numberGoodP;
    startPositive_[1]=numberGoodM;
    startPositive_[2]=numberBad;
    startNegative_ = NULL;
  } else {
    numberRows_ ++; //  correct
    // but number should be same as rhs
    assert (numberRows_<=rhs.getNumRows());
    numberRows_ = rhs.getNumRows();
    columnOrdered_ = true;
  }
  // Check valid
  if (!numberBad)
    checkValid(false);
}

//-------------------------------------------------------------------
// Destructor 
//-------------------------------------------------------------------
ClpPlusMinusOneMatrix::~ClpPlusMinusOneMatrix ()
{
  delete matrix_;
  delete [] startPositive_;
  delete [] startNegative_;
  delete [] lengths_;
  delete [] indices_;
}

//----------------------------------------------------------------
// Assignment operator 
//-------------------------------------------------------------------
ClpPlusMinusOneMatrix &
ClpPlusMinusOneMatrix::operator=(const ClpPlusMinusOneMatrix& rhs)
{
  if (this != &rhs) {
    ClpMatrixBase::operator=(rhs);
    delete matrix_;
    delete [] startPositive_;
    delete [] startNegative_;
    delete [] lengths_;
    delete [] indices_;
    matrix_ = NULL;
    startPositive_ = NULL;
    lengths_=NULL;
    indices_=NULL;
    numberRows_=rhs.numberRows_;
    numberColumns_=rhs.numberColumns_;
    columnOrdered_=rhs.columnOrdered_;
    if (numberColumns_) {
      CoinBigIndex numberElements = rhs.startPositive_[numberColumns_];
      indices_ = new int [ numberElements];
      CoinMemcpyN(rhs.indices_,numberElements,indices_);
      startPositive_ = new CoinBigIndex [ numberColumns_+1];
      CoinMemcpyN(rhs.startPositive_,(numberColumns_+1),startPositive_);
      startNegative_ = new CoinBigIndex [ numberColumns_];
      CoinMemcpyN(rhs.startNegative_,numberColumns_,startNegative_);
    }
  }
  return *this;
}
//-------------------------------------------------------------------
// Clone
//-------------------------------------------------------------------
ClpMatrixBase * ClpPlusMinusOneMatrix::clone() const
{
  return new ClpPlusMinusOneMatrix(*this);
}
/* Subset clone (without gaps).  Duplicates are allowed
   and order is as given */
ClpMatrixBase * 
ClpPlusMinusOneMatrix::subsetClone (int numberRows, const int * whichRows,
			      int numberColumns, 
			      const int * whichColumns) const 
{
  return new ClpPlusMinusOneMatrix(*this, numberRows, whichRows,
				   numberColumns, whichColumns);
}
/* Subset constructor (without gaps).  Duplicates are allowed
   and order is as given */
ClpPlusMinusOneMatrix::ClpPlusMinusOneMatrix (
		       const ClpPlusMinusOneMatrix & rhs,
		       int numberRows, const int * whichRow,
		       int numberColumns, const int * whichColumn)
: ClpMatrixBase(rhs)
{  
  matrix_ = NULL;
  startPositive_ = NULL;
  startNegative_ = NULL;
  lengths_=NULL;
  indices_=NULL;
  numberRows_=0;
  numberColumns_=0;
  columnOrdered_=rhs.columnOrdered_;
  if (numberRows<=0||numberColumns<=0) {
    startPositive_ = new CoinBigIndex [1];
    startPositive_[0] = 0;
  } else {
    numberColumns_ = numberColumns;
    numberRows_ = numberRows;
    const int * index1 = rhs.indices_;
    CoinBigIndex * startPositive1 = rhs.startPositive_;

    int numberMinor = (!columnOrdered_) ? numberColumns_ : numberRows_;
    int numberMajor = (columnOrdered_) ? numberColumns_ : numberRows_;
    int numberMinor1 = (!columnOrdered_) ? rhs.numberColumns_ : rhs.numberRows_;
    int numberMajor1 = (columnOrdered_) ? rhs.numberColumns_ : rhs.numberRows_;
    // Also swap incoming if not column ordered
    if (!columnOrdered_) {
      int temp1 = numberRows;
      numberRows = numberColumns;
      numberColumns = temp1;
      const int * temp2;
      temp2 = whichRow;
      whichRow = whichColumn;
      whichColumn = temp2;
    }
    // Throw exception if rhs empty
    if (numberMajor1 <= 0 || numberMinor1 <= 0)
      throw CoinError("empty rhs", "subset constructor", "ClpPlusMinusOneMatrix");
    // Array to say if an old row is in new copy
    int * newRow = new int [numberMinor1];
    int iRow;
    for (iRow=0;iRow<numberMinor1;iRow++) 
      newRow[iRow] = -1;
    // and array for duplicating rows
    int * duplicateRow = new int [numberMinor];
    int numberBad=0;
    for (iRow=0;iRow<numberMinor;iRow++) {
      duplicateRow[iRow] = -1;
      int kRow = whichRow[iRow];
      if (kRow>=0  && kRow < numberMinor1) {
	if (newRow[kRow]<0) {
	  // first time
	  newRow[kRow]=iRow;
	} else {
	  // duplicate
	  int lastRow = newRow[kRow];
	  newRow[kRow]=iRow;
	  duplicateRow[iRow] = lastRow;
	}
      } else {
	// bad row
	numberBad++;
      }
    }

    if (numberBad)
      throw CoinError("bad minor entries", 
		      "subset constructor", "ClpPlusMinusOneMatrix");
    // now get size and check columns
    CoinBigIndex size = 0;
    int iColumn;
    numberBad=0;
    for (iColumn=0;iColumn<numberMajor;iColumn++) {
      int kColumn = whichColumn[iColumn];
      if (kColumn>=0  && kColumn <numberMajor1) {
	CoinBigIndex i;
	for (i=startPositive1[kColumn];i<startPositive1[kColumn+1];i++) {
	  int kRow = index1[i];
	  kRow = newRow[kRow];
	  while (kRow>=0) {
	    size++;
	    kRow = duplicateRow[kRow];
	  }
	}
      } else {
	// bad column
	numberBad++;
	printf("%d %d %d %d\n",iColumn,numberMajor,numberMajor1,kColumn);
      }
    }
    if (numberBad)
      throw CoinError("bad major entries", 
		      "subset constructor", "ClpPlusMinusOneMatrix");
    // now create arrays
    startPositive_ = new CoinBigIndex [numberMajor+1];
    startNegative_ = new CoinBigIndex [numberMajor];
    indices_ = new int[size];
    // and fill them
    size = 0;
    startPositive_[0]=0;
    CoinBigIndex * startNegative1 = rhs.startNegative_;
    for (iColumn=0;iColumn<numberMajor;iColumn++) {
      int kColumn = whichColumn[iColumn];
      CoinBigIndex i;
      for (i=startPositive1[kColumn];i<startNegative1[kColumn];i++) {
	int kRow = index1[i];
	kRow = newRow[kRow];
	while (kRow>=0) {
	  indices_[size++] = kRow;
	  kRow = duplicateRow[kRow];
	}
      }
      startNegative_[iColumn] = size;
      for (;i<startPositive1[kColumn+1];i++) {
	int kRow = index1[i];
	kRow = newRow[kRow];
	while (kRow>=0) {
	  indices_[size++] = kRow;
	  kRow = duplicateRow[kRow];
	}
      }
      startPositive_[iColumn+1] = size;
    }
    delete [] newRow;
    delete [] duplicateRow;
  }
  // Check valid
  checkValid(false);
}


/* Returns a new matrix in reverse order without gaps */
ClpMatrixBase * 
ClpPlusMinusOneMatrix::reverseOrderedCopy() const
{
  int numberMinor = (!columnOrdered_) ? numberColumns_ : numberRows_;
  int numberMajor = (columnOrdered_) ? numberColumns_ : numberRows_;
  // count number in each row/column
  CoinBigIndex * tempP = new CoinBigIndex [numberMinor];
  CoinBigIndex * tempN = new CoinBigIndex [numberMinor];
  memset(tempP,0,numberMinor*sizeof(CoinBigIndex));
  memset(tempN,0,numberMinor*sizeof(CoinBigIndex));
  CoinBigIndex j=0;
  int i;
  for (i=0;i<numberMajor;i++) {
    for (;j<startNegative_[i];j++) {
      int iRow = indices_[j];
      tempP[iRow]++;
    }
    for (;j<startPositive_[i+1];j++) {
      int iRow = indices_[j];
      tempN[iRow]++;
    }
  }
  int * newIndices = new int [startPositive_[numberMajor]];
  CoinBigIndex * newP = new CoinBigIndex [numberMinor+1];
  CoinBigIndex * newN = new CoinBigIndex[numberMinor];
  int iRow;
  j=0;
  // do starts
  for (iRow=0;iRow<numberMinor;iRow++) {
    newP[iRow]=j;
    j += tempP[iRow];
    tempP[iRow]=newP[iRow];
    newN[iRow] = j;
    j += tempN[iRow];
    tempN[iRow]=newN[iRow];
  }
  newP[numberMinor]=j;
  j=0;
  for (i=0;i<numberMajor;i++) {
    for (;j<startNegative_[i];j++) {
      int iRow = indices_[j];
      CoinBigIndex put = tempP[iRow];
      newIndices[put++] = i;
      tempP[iRow] = put;
    }
    for (;j<startPositive_[i+1];j++) {
      int iRow = indices_[j];
      CoinBigIndex put = tempN[iRow];
      newIndices[put++] = i;
      tempN[iRow] = put;
    }
  }
  delete [] tempP;
  delete [] tempN;
  ClpPlusMinusOneMatrix * newCopy = new ClpPlusMinusOneMatrix();
  newCopy->passInCopy(numberMinor, numberMajor,
		      !columnOrdered_,  newIndices, newP, newN);
  return newCopy;
}
//unscaled versions
void 
ClpPlusMinusOneMatrix::times(double scalar,
		   const double * x, double * y) const
{
  int numberMajor = (columnOrdered_) ? numberColumns_ : numberRows_;
  int i;
  CoinBigIndex j;
  assert (columnOrdered_);
  for (i=0;i<numberMajor;i++) {
    double value = scalar*x[i];
    if (value) {
      for (j=startPositive_[i];j<startNegative_[i];j++) {
	int iRow = indices_[j];
	y[iRow] += value;
      }
      for (;j<startPositive_[i+1];j++) {
	int iRow = indices_[j];
	y[iRow] -= value;
      }
    }
  }
}
void 
ClpPlusMinusOneMatrix::transposeTimes(double scalar,
				const double * x, double * y) const
{
  int numberMajor = (columnOrdered_) ? numberColumns_ : numberRows_;
  int i;
  CoinBigIndex j=0;
  assert (columnOrdered_);
  for (i=0;i<numberMajor;i++) {
    double value = 0.0;
    for (;j<startNegative_[i];j++) {
      int iRow = indices_[j];
      value += x[iRow];
    }
    for (;j<startPositive_[i+1];j++) {
      int iRow = indices_[j];
      value -= x[iRow];
    }
    y[i] += scalar*value;
  }
}
void 
ClpPlusMinusOneMatrix::times(double scalar,
		       const double * x, double * y,
			     const double * /*rowScale*/, 
			     const double * /*columnScale*/) const
{
  // we know it is not scaled 
  times(scalar, x, y);
}
void 
ClpPlusMinusOneMatrix::transposeTimes( double scalar,
				 const double * x, double * y,
				       const double * /*rowScale*/, 
				       const double * /*columnScale*/,
				       double * /*spare*/) const
{
  // we know it is not scaled 
  transposeTimes(scalar, x, y);
}
/* Return <code>x * A + y</code> in <code>z</code>. 
	Squashes small elements and knows about ClpSimplex */
void 
ClpPlusMinusOneMatrix::transposeTimes(const ClpSimplex * model, double scalar,
			      const CoinIndexedVector * rowArray,
			      CoinIndexedVector * y,
			      CoinIndexedVector * columnArray) const
{
  // we know it is not scaled 
  columnArray->clear();
  double * pi = rowArray->denseVector();
  int numberNonZero=0;
  int * index = columnArray->getIndices();
  double * array = columnArray->denseVector();
  int numberInRowArray = rowArray->getNumElements();
  // maybe I need one in OsiSimplex
  double zeroTolerance = model->zeroTolerance();
  int numberRows = model->numberRows();
  bool packed = rowArray->packedMode();
#ifndef NO_RTTI
  ClpPlusMinusOneMatrix* rowCopy =
    dynamic_cast< ClpPlusMinusOneMatrix*>(model->rowCopy());
#else
  ClpPlusMinusOneMatrix* rowCopy =
    static_cast< ClpPlusMinusOneMatrix*>(model->rowCopy());
#endif
  double factor = 0.3;
  // We may not want to do by row if there may be cache problems
  int numberColumns = model->numberColumns();
  // It would be nice to find L2 cache size - for moment 512K
  // Be slightly optimistic
  if (numberColumns*sizeof(double)>1000000) {
    if (numberRows*10<numberColumns)
      factor=0.1;
    else if (numberRows*4<numberColumns)
      factor=0.15;
    else if (numberRows*2<numberColumns)
      factor=0.2;
  }
  if (numberInRowArray>factor*numberRows||!rowCopy) {
    assert (!y->getNumElements());
    // do by column
    // Need to expand if packed mode
    int iColumn;
    CoinBigIndex j=0;
    assert (columnOrdered_);
    if (packed) {
      // need to expand pi into y
      assert(y->capacity()>=numberRows);
      double * piOld = pi;
      pi = y->denseVector();
      const int * whichRow = rowArray->getIndices();
      int i;
      // modify pi so can collapse to one loop
      for (i=0;i<numberInRowArray;i++) {
	int iRow = whichRow[i];
	pi[iRow]=scalar*piOld[i];
      }
      for (iColumn=0;iColumn<numberColumns_;iColumn++) {
	double value = 0.0;
	for (;j<startNegative_[iColumn];j++) {
	  int iRow = indices_[j];
	  value += pi[iRow];
	}
	for (;j<startPositive_[iColumn+1];j++) {
	  int iRow = indices_[j];
	  value -= pi[iRow];
	}
	if (fabs(value)>zeroTolerance) {
	  array[numberNonZero]=value;
	  index[numberNonZero++]=iColumn;
	}
      }
      for (i=0;i<numberInRowArray;i++) {
	int iRow = whichRow[i];
	pi[iRow]=0.0;
      }
    } else {
      for (iColumn=0;iColumn<numberColumns_;iColumn++) {
	double value = 0.0;
	for (;j<startNegative_[iColumn];j++) {
	  int iRow = indices_[j];
	  value += pi[iRow];
	}
	for (;j<startPositive_[iColumn+1];j++) {
	  int iRow = indices_[j];
	  value -= pi[iRow];
	}
	value *= scalar;
	if (fabs(value)>zeroTolerance) {
	  index[numberNonZero++]=iColumn;
	  array[iColumn]=value;
	}
      }
    }
    columnArray->setNumElements(numberNonZero);
  } else {
    // do by row
    rowCopy->transposeTimesByRow(model, scalar, rowArray, y, columnArray);
  }
}
/* Return <code>x * A + y</code> in <code>z</code>. 
	Squashes small elements and knows about ClpSimplex */
void 
ClpPlusMinusOneMatrix::transposeTimesByRow(const ClpSimplex * model, double scalar,
			      const CoinIndexedVector * rowArray,
			      CoinIndexedVector * y,
			      CoinIndexedVector * columnArray) const
{
  columnArray->clear();
  double * pi = rowArray->denseVector();
  int numberNonZero=0;
  int * index = columnArray->getIndices();
  double * array = columnArray->denseVector();
  int numberInRowArray = rowArray->getNumElements();
  // maybe I need one in OsiSimplex
  double zeroTolerance = model->zeroTolerance();
  const int * column = indices_;
  const CoinBigIndex * startPositive = startPositive_;
  const CoinBigIndex * startNegative = startNegative_;
  const int * whichRow = rowArray->getIndices();
  bool packed = rowArray->packedMode();
  if (numberInRowArray>2) {
    // do by rows
    int iRow;
    double * markVector = y->denseVector(); // probably empty .. but
    int numberOriginal=0;
    int i;
    if (packed) {
      numberNonZero=0;
      // and set up mark as char array
      char * marked = reinterpret_cast<char *> (index+columnArray->capacity());
      double * array2 = y->denseVector();
#ifdef CLP_DEBUG
      int numberColumns = model->numberColumns();
      for (i=0;i<numberColumns;i++) {
	assert(!marked[i]);
	assert(!array2[i]);
      }
#endif
      for (i=0;i<numberInRowArray;i++) {
	iRow = whichRow[i]; 
	double value = pi[i]*scalar;
	CoinBigIndex j;
	for (j=startPositive[iRow];j<startNegative[iRow];j++) {
	  int iColumn = column[j];
	  if (!marked[iColumn]) {
	    marked[iColumn]=1;
	    index[numberNonZero++]=iColumn;
	  }
	  array2[iColumn] += value;
	}
	for (j=startNegative[iRow];j<startPositive[iRow+1];j++) {
	  int iColumn = column[j];
	  if (!marked[iColumn]) {
	    marked[iColumn]=1;
	    index[numberNonZero++]=iColumn;
	  }
	  array2[iColumn] -= value;
	}
      }
      // get rid of tiny values and zero out marked
      numberOriginal=numberNonZero;
      numberNonZero=0;
      for (i=0;i<numberOriginal;i++) {
	int iColumn = index[i];
	if (marked[iColumn]) {
	  double value = array2[iColumn];
	  array2[iColumn]=0.0;
	  marked[iColumn]=0;
	  if (fabs(value)>zeroTolerance) {
	    array[numberNonZero]=value;
	    index[numberNonZero++]=iColumn;
	  }
	}
      }
    } else {      
      numberNonZero=0;
      // and set up mark as char array
      char * marked = reinterpret_cast<char *> (markVector);
      for (i=0;i<numberOriginal;i++) {
	int iColumn = index[i];
	marked[iColumn]=0;
      }
      for (i=0;i<numberInRowArray;i++) {
	iRow = whichRow[i]; 
	double value = pi[iRow]*scalar;
	CoinBigIndex j;
	for (j=startPositive[iRow];j<startNegative[iRow];j++) {
	  int iColumn = column[j];
	  if (!marked[iColumn]) {
	    marked[iColumn]=1;
	    index[numberNonZero++]=iColumn;
	  }
	  array[iColumn] += value;
	}
	for (j=startNegative[iRow];j<startPositive[iRow+1];j++) {
	  int iColumn = column[j];
	  if (!marked[iColumn]) {
	    marked[iColumn]=1;
	    index[numberNonZero++]=iColumn;
	  }
	  array[iColumn] -= value;
	}
      }
      // get rid of tiny values and zero out marked
      numberOriginal=numberNonZero;
      numberNonZero=0;
      for (i=0;i<numberOriginal;i++) {
	int iColumn = index[i];
	marked[iColumn]=0;
	if (fabs(array[iColumn])>zeroTolerance) {
	  index[numberNonZero++]=iColumn;
	} else {
	  array[iColumn]=0.0;
	}
      }
    }
  } else if (numberInRowArray==2) {
    /* do by rows when two rows (do longer first when not packed
       and shorter first if packed */
    int iRow0 = whichRow[0];
    int iRow1 = whichRow[1];
    CoinBigIndex j;
    if (packed) {
      double pi0 = pi[0];
      double pi1 = pi[1];
      if (startPositive[iRow0+1]-startPositive[iRow0]>
	  startPositive[iRow1+1]-startPositive[iRow1]) {
	int temp = iRow0;
	iRow0 = iRow1;
	iRow1 = temp;
	pi0=pi1;
	pi1=pi[0];
      }
      // and set up mark as char array
      char * marked = reinterpret_cast<char *> (index+columnArray->capacity());
      int * lookup = y->getIndices();
      double value = pi0*scalar;
      for (j=startPositive[iRow0];j<startNegative[iRow0];j++) {
	int iColumn = column[j];
	array[numberNonZero] = value;
	marked[iColumn]=1;
	lookup[iColumn]=numberNonZero;
	index[numberNonZero++]=iColumn;
      }
      for (j=startNegative[iRow0];j<startPositive[iRow0+1];j++) {
	int iColumn = column[j];
	array[numberNonZero] = -value;
	marked[iColumn]=1;
	lookup[iColumn]=numberNonZero;
	index[numberNonZero++]=iColumn;
      }
      int numberOriginal = numberNonZero;
      value = pi1*scalar;
      for (j=startPositive[iRow1];j<startNegative[iRow1];j++) {
	int iColumn = column[j];
	if (marked[iColumn]) {
	  int iLookup = lookup[iColumn];
	  array[iLookup] += value;
	} else {
	  if (fabs(value)>zeroTolerance) {
	    array[numberNonZero] = value;
	    index[numberNonZero++]=iColumn;
	  }
	}
      }
      for (j=startNegative[iRow1];j<startPositive[iRow1+1];j++) {
	int iColumn = column[j];
	if (marked[iColumn]) {
	  int iLookup = lookup[iColumn];
	  array[iLookup] -= value;
	} else {
	  if (fabs(value)>zeroTolerance) {
	    array[numberNonZero] = -value;
	    index[numberNonZero++]=iColumn;
	  }
	}
      }
      // get rid of tiny values and zero out marked
      int nDelete=0;
      for (j=0;j<numberOriginal;j++) {
	int iColumn = index[j];
	marked[iColumn]=0;
	if (fabs(array[j])<=zeroTolerance) 
	  nDelete++;
      }
      if (nDelete) {
	numberOriginal=numberNonZero;
	numberNonZero=0;
	for (j=0;j<numberOriginal;j++) {
	  int iColumn = index[j];
	  double value = array[j];
	  array[j]=0.0;
	  if (fabs(value)>zeroTolerance) {
	    array[numberNonZero]=value;
	    index[numberNonZero++]=iColumn;
	  }
	}
      }
    } else {
      if (startPositive[iRow0+1]-startPositive[iRow0]<
	  startPositive[iRow1+1]-startPositive[iRow1]) {
	int temp = iRow0;
	iRow0 = iRow1;
	iRow1 = temp;
      }
      int numberOriginal;
      int i;
      numberNonZero=0;
      double value;
      value = pi[iRow0]*scalar;
      CoinBigIndex j;
      for (j=startPositive[iRow0];j<startNegative[iRow0];j++) {
	int iColumn = column[j];
	index[numberNonZero++]=iColumn;
	array[iColumn] = value;
      }
      for (j=startNegative[iRow0];j<startPositive[iRow0+1];j++) {
	int iColumn = column[j];
	index[numberNonZero++]=iColumn;
	array[iColumn] = -value;
      }
      value = pi[iRow1]*scalar;
      for (j=startPositive[iRow1];j<startNegative[iRow1];j++) {
	int iColumn = column[j];
	double value2= array[iColumn];
	if (value2) {
	  value2 += value;
	} else {
	  value2 = value;
	  index[numberNonZero++]=iColumn;
	}
	array[iColumn] = value2;
      }
      for (j=startNegative[iRow1];j<startPositive[iRow1+1];j++) {
	int iColumn = column[j];
	double value2= array[iColumn];
	if (value2) {
	  value2 -= value;
	} else {
	  value2 = -value;
	  index[numberNonZero++]=iColumn;
	}
	array[iColumn] = value2;
      }
      // get rid of tiny values and zero out marked
      numberOriginal=numberNonZero;
      numberNonZero=0;
      for (i=0;i<numberOriginal;i++) {
	int iColumn = index[i];
	if (fabs(array[iColumn])>zeroTolerance) {
	  index[numberNonZero++]=iColumn;
	} else {
	  array[iColumn]=0.0;
	}
      }
    }
  } else if (numberInRowArray==1) {
    // Just one row
    int iRow=rowArray->getIndices()[0];
    numberNonZero=0;
    double value;
    iRow = whichRow[0]; 
    CoinBigIndex j;
    if (packed) {
      value = pi[0]*scalar;
      if (fabs(value)>zeroTolerance) {
	for (j=startPositive[iRow];j<startNegative[iRow];j++) {
	  int iColumn = column[j];
	  array[numberNonZero] = value;
	  index[numberNonZero++]=iColumn;
	}
	for (j=startNegative[iRow];j<startPositive[iRow+1];j++) {
	  int iColumn = column[j];
	  array[numberNonZero] = -value;
	  index[numberNonZero++]=iColumn;
	}
      }
    } else {
      value = pi[iRow]*scalar;
      if (fabs(value)>zeroTolerance) {
	for (j=startPositive[iRow];j<startNegative[iRow];j++) {
	  int iColumn = column[j];
	  array[iColumn] = value;
	  index[numberNonZero++]=iColumn;
	}
	for (j=startNegative[iRow];j<startPositive[iRow+1];j++) {
	  int iColumn = column[j];
	  array[iColumn] = -value;
	  index[numberNonZero++]=iColumn;
	}
      }
    }
  }
  columnArray->setNumElements(numberNonZero);
  if (packed)
    columnArray->setPacked();
  y->setNumElements(0);
}
/* Return <code>x *A in <code>z</code> but
   just for indices in y. */
void 
ClpPlusMinusOneMatrix::subsetTransposeTimes(const ClpSimplex * ,
			      const CoinIndexedVector * rowArray,
			      const CoinIndexedVector * y,
			      CoinIndexedVector * columnArray) const
{
  columnArray->clear();
  double * pi = rowArray->denseVector();
  double * array = columnArray->denseVector();
  int jColumn;
  int numberToDo = y->getNumElements();
  const int * which = y->getIndices();
  assert (!rowArray->packedMode());
  columnArray->setPacked();
  for (jColumn=0;jColumn<numberToDo;jColumn++) {
    int iColumn = which[jColumn];
    double value = 0.0;
    CoinBigIndex j=startPositive_[iColumn];
    for (;j<startNegative_[iColumn];j++) {
      int iRow = indices_[j];
      value += pi[iRow];
    }
    for (;j<startPositive_[iColumn+1];j++) {
      int iRow = indices_[j];
      value -= pi[iRow];
    }
    array[jColumn]=value;
  }
}
/// returns number of elements in column part of basis,
CoinBigIndex 
ClpPlusMinusOneMatrix::countBasis(const int * whichColumn, 
				  int & numberColumnBasic)
{
  int i;
  CoinBigIndex numberElements=0;
  for (i=0;i<numberColumnBasic;i++) {
    int iColumn = whichColumn[i];
    numberElements += startPositive_[iColumn+1]-startPositive_[iColumn];
  }
  return numberElements;
}
void
ClpPlusMinusOneMatrix::fillBasis(ClpSimplex * ,
			 const int * whichColumn, 
			 int & numberColumnBasic,
			 int * indexRowU, int * start,
			 int * rowCount, int * columnCount,
			 CoinFactorizationDouble * elementU)
{
  int i;
  CoinBigIndex numberElements=start[0];
  assert (columnOrdered_);
  for (i=0;i<numberColumnBasic;i++) {
    int iColumn = whichColumn[i];
    CoinBigIndex j=startPositive_[iColumn];
    for (;j<startNegative_[iColumn];j++) {
      int iRow = indices_[j];
      indexRowU[numberElements]=iRow;
      rowCount[iRow]++;
      elementU[numberElements++]=1.0;
    }
    for (;j<startPositive_[iColumn+1];j++) {
      int iRow = indices_[j];
      indexRowU[numberElements]=iRow;
      rowCount[iRow]++;
      elementU[numberElements++]=-1.0;
    }
    start[i+1]=numberElements;
    columnCount[i]=numberElements-start[i];
  }
}
/* Unpacks a column into an CoinIndexedvector
 */
void 
ClpPlusMinusOneMatrix::unpack(const ClpSimplex * ,
			      CoinIndexedVector * rowArray,
			      int iColumn) const 
{
  CoinBigIndex j=startPositive_[iColumn];
  for (;j<startNegative_[iColumn];j++) {
    int iRow = indices_[j];
    rowArray->add(iRow,1.0);
  }
  for (;j<startPositive_[iColumn+1];j++) {
    int iRow = indices_[j];
    rowArray->add(iRow,-1.0);
  }
}
/* Unpacks a column into an CoinIndexedvector
** in packed foramt
Note that model is NOT const.  Bounds and objective could
be modified if doing column generation (just for this variable) */
void 
ClpPlusMinusOneMatrix::unpackPacked(ClpSimplex * ,
			    CoinIndexedVector * rowArray,
			    int iColumn) const
{
  int * index = rowArray->getIndices();
  double * array = rowArray->denseVector();
  int number = 0;
  CoinBigIndex j=startPositive_[iColumn];
  for (;j<startNegative_[iColumn];j++) {
    int iRow = indices_[j];
    array[number]=1.0;
    index[number++]=iRow;
  }
  for (;j<startPositive_[iColumn+1];j++) {
    int iRow = indices_[j];
    array[number]=-1.0;
    index[number++]=iRow;
  }
  rowArray->setNumElements(number);
  rowArray->setPackedMode(true);
}
/* Adds multiple of a column into an CoinIndexedvector
      You can use quickAdd to add to vector */
void 
ClpPlusMinusOneMatrix::add(const ClpSimplex * ,CoinIndexedVector * rowArray,
		   int iColumn, double multiplier) const 
{
  CoinBigIndex j=startPositive_[iColumn];
  for (;j<startNegative_[iColumn];j++) {
    int iRow = indices_[j];
    rowArray->quickAdd(iRow,multiplier);
  }
  for (;j<startPositive_[iColumn+1];j++) {
    int iRow = indices_[j];
    rowArray->quickAdd(iRow,-multiplier);
  }
}
/* Adds multiple of a column into an array */
void 
ClpPlusMinusOneMatrix::add(const ClpSimplex * ,double * array,
		    int iColumn, double multiplier) const
{
  CoinBigIndex j=startPositive_[iColumn];
  for (;j<startNegative_[iColumn];j++) {
    int iRow = indices_[j];
    array[iRow] += multiplier;
  }
  for (;j<startPositive_[iColumn+1];j++) {
    int iRow = indices_[j];
    array[iRow] -= multiplier;
  }
}

// Return a complete CoinPackedMatrix
CoinPackedMatrix * 
ClpPlusMinusOneMatrix::getPackedMatrix() const 
{
  if (!matrix_) {
    int numberMinor = (!columnOrdered_) ? numberColumns_ : numberRows_;
    int numberMajor = (columnOrdered_) ? numberColumns_ : numberRows_;
    int numberElements = startPositive_[numberMajor];
    double * elements = new double [numberElements];
    CoinBigIndex j=0;
    int i;
    for (i=0;i<numberMajor;i++) {
      for (;j<startNegative_[i];j++) {
	elements[j]=1.0;
      }
      for (;j<startPositive_[i+1];j++) {
	elements[j]=-1.0;
      }
    }
    matrix_ =  new CoinPackedMatrix(columnOrdered_,numberMinor,numberMajor,
			      getNumElements(),
			      elements,indices_,
			      startPositive_,getVectorLengths());
    delete [] elements;
    delete [] lengths_;
    lengths_ = NULL;
  }
  return matrix_;
}
/* A vector containing the elements in the packed matrix. Note that there
   might be gaps in this list, entries that do not belong to any
   major-dimension vector. To get the actual elements one should look at
   this vector together with vectorStarts and vectorLengths. */
const double * 
ClpPlusMinusOneMatrix::getElements() const 
{
  if (!matrix_) 
    getPackedMatrix();
  return matrix_->getElements();
}

const CoinBigIndex * 
ClpPlusMinusOneMatrix::getVectorStarts() const 
{
  return startPositive_;
}
/* The lengths of the major-dimension vectors. */
const int * 
ClpPlusMinusOneMatrix::getVectorLengths() const
{
  if (!lengths_) {
    int numberMajor = (columnOrdered_) ? numberColumns_ : numberRows_;
    lengths_ = new int [numberMajor];
    int i;
    for (i=0;i<numberMajor;i++) {
      lengths_[i]=startPositive_[i+1]-startPositive_[i];
    }
  }
  return lengths_;
}
/* Delete the columns whose indices are listed in <code>indDel</code>. */
void 
ClpPlusMinusOneMatrix::deleteCols(const int numDel, const int * indDel) 
{
  int iColumn;
  CoinBigIndex newSize=startPositive_[numberColumns_];;
  int numberBad=0;
  // Use array to make sure we can have duplicates
  int * which = new int[numberColumns_];
  memset(which,0,numberColumns_*sizeof(int));
  int nDuplicate=0;
  for (iColumn=0;iColumn<numDel;iColumn++) {
    int jColumn = indDel[iColumn];
    if (jColumn<0||jColumn>=numberColumns_) {
      numberBad++;
    } else {
      newSize -= startPositive_[jColumn+1]-startPositive_[jColumn];
      if (which[jColumn])
	nDuplicate++;
      else
	which[jColumn]=1;
    }
  }
  if (numberBad)
    throw CoinError("Indices out of range", "deleteCols", "ClpPlusMinusOneMatrix");
  int newNumber = numberColumns_-numDel+nDuplicate;
  // Get rid of temporary arrays
  delete [] lengths_;
  lengths_=NULL;
  delete matrix_;
  matrix_= NULL;
  CoinBigIndex * newPositive = new CoinBigIndex [newNumber+1];
  CoinBigIndex * newNegative = new CoinBigIndex [newNumber];
  int * newIndices = new int [newSize];
  newNumber=0;
  newSize=0;
  for (iColumn=0;iColumn<numberColumns_;iColumn++) {
    if (!which[iColumn]) {
      CoinBigIndex start,end;
      CoinBigIndex i;
      start = startPositive_[iColumn];
      end=startNegative_[iColumn];
      newPositive[newNumber]=newSize;
      for (i=start;i<end;i++) 
	newIndices[newSize++]=indices_[i];
      start = startNegative_[iColumn];
      end=startPositive_[iColumn+1];
      newNegative[newNumber++]=newSize;
      for (i=start;i<end;i++) 
	newIndices[newSize++]=indices_[i];
    }
  }
  newPositive[newNumber]=newSize;
  delete [] which;
  delete [] startPositive_;
  startPositive_= newPositive;
  delete [] startNegative_;
  startNegative_= newNegative;
  delete [] indices_;
  indices_= newIndices;
  numberColumns_ = newNumber;
}
/* Delete the rows whose indices are listed in <code>indDel</code>. */
void 
ClpPlusMinusOneMatrix::deleteRows(const int numDel, const int * indDel) 
{
  int iRow;
  int numberBad=0;
  // Use array to make sure we can have duplicates
  int * which = new int[numberRows_];
  memset(which,0,numberRows_*sizeof(int));
  int nDuplicate=0;
  for (iRow=0;iRow<numDel;iRow++) {
    int jRow = indDel[iRow];
    if (jRow<0||jRow>=numberRows_) {
      numberBad++;
    } else {
      if (which[jRow])
	nDuplicate++;
      else
	which[jRow]=1;
    }
  }
  if (numberBad)
    throw CoinError("Indices out of range", "deleteRows", "ClpPlusMinusOneMatrix");
  CoinBigIndex iElement;
  CoinBigIndex numberElements=startPositive_[numberColumns_];
  CoinBigIndex newSize=0;
  for (iElement=0;iElement<numberElements;iElement++) {
    iRow = indices_[iElement];
    if (!which[iRow])
      newSize++;
  }
  int newNumber = numberRows_-numDel+nDuplicate;
  // Get rid of temporary arrays
  delete [] lengths_;
  lengths_=NULL;
  delete matrix_;
  matrix_= NULL;
  int * newIndices = new int [newSize];
  newSize=0;
  int iColumn;
  for (iColumn=0;iColumn<numberColumns_;iColumn++) {
    CoinBigIndex start,end;
    CoinBigIndex i;
    start = startPositive_[iColumn];
    end=startNegative_[iColumn];
    startPositive_[newNumber]=newSize;
    for (i=start;i<end;i++) {
	iRow = indices_[i];
	if (!which[iRow])
	  newIndices[newSize++]=iRow;
    }
    start = startNegative_[iColumn];
    end=startPositive_[iColumn+1];
    startNegative_[newNumber]=newSize;
    for (i=start;i<end;i++) {
	iRow = indices_[i];
	if (!which[iRow])
	  newIndices[newSize++]=iRow;
    }
  }
  startPositive_[numberColumns_]=newSize;
  delete [] which;
  delete [] indices_;
  indices_= newIndices;
  numberRows_ = newNumber;
}
bool 
ClpPlusMinusOneMatrix::isColOrdered() const 
{ 
  return columnOrdered_;
}
/* Number of entries in the packed matrix. */
CoinBigIndex 
ClpPlusMinusOneMatrix::getNumElements() const 
{
  int numberMajor = (columnOrdered_) ? numberColumns_ : numberRows_;
  if (startPositive_) 
    return startPositive_[numberMajor];
  else
    return 0;
}
// pass in copy (object takes ownership)
void 
ClpPlusMinusOneMatrix::passInCopy(int numberRows, int numberColumns,
		  bool columnOrdered, int * indices,
		  CoinBigIndex * startPositive, CoinBigIndex * startNegative)
{
  columnOrdered_=columnOrdered;
  startPositive_ = startPositive;
  startNegative_ = startNegative;
  indices_ = indices;
  numberRows_=numberRows;
  numberColumns_=numberColumns;
  // Check valid
  checkValid(false);
}
// Just checks matrix valid - will say if dimensions not quite right if detail
void 
ClpPlusMinusOneMatrix::checkValid(bool detail) const
{
  int maxIndex=-1;
  int minIndex= columnOrdered_ ? numberRows_ : numberColumns_;
  int number= !columnOrdered_ ? numberRows_ : numberColumns_;
  int numberElements = getNumElements();
  CoinBigIndex last=-1;
  int bad=0;
  for (int i=0;i<number;i++) {
    if(startPositive_[i]<last)
      bad++;
    else
      last = startPositive_[i];
    if(startNegative_[i]<last)
      bad++;
    else
      last = startNegative_[i];
  }
  if(startPositive_[number]<last)
    bad++;
  CoinAssertHint(!bad,"starts are not monotonic");
  for (CoinBigIndex cbi=0;cbi<numberElements;cbi++) {
    maxIndex = CoinMax(indices_[cbi],maxIndex);
    minIndex = CoinMin(indices_[cbi],minIndex);
  }
  CoinAssert(maxIndex<(columnOrdered_ ? numberRows_ : numberColumns_));
  CoinAssert(minIndex>=0);
  if (detail) {
    if (minIndex>0||maxIndex+1<(columnOrdered_ ? numberRows_ : numberColumns_))
      printf("Not full range of indices - %d to %d\n",minIndex,maxIndex);
  }
}
/* Given positive integer weights for each row fills in sum of weights
   for each column (and slack).
   Returns weights vector
*/
CoinBigIndex * 
ClpPlusMinusOneMatrix::dubiousWeights(const ClpSimplex * model,int * inputWeights) const
{
  int numberRows = model->numberRows();
  int numberColumns =model->numberColumns();
  int number = numberRows+numberColumns;
  CoinBigIndex * weights = new CoinBigIndex[number];
  int i;
  for (i=0;i<numberColumns;i++) {
    CoinBigIndex j;
    CoinBigIndex count=0;
    for (j=startPositive_[i];j<startPositive_[i+1];j++) {
      int iRow=indices_[j];
      count += inputWeights[iRow];
    }
    weights[i]=count;
  }
  for (i=0;i<numberRows;i++) {
    weights[i+numberColumns]=inputWeights[i];
  }
  return weights;
}
// Append Columns
void 
ClpPlusMinusOneMatrix::appendCols(int number, const CoinPackedVectorBase * const * columns)
{
  int iColumn;
  CoinBigIndex size=0;
  int numberBad=0;
  for (iColumn=0;iColumn<number;iColumn++) {
    int n=columns[iColumn]->getNumElements();
    const double * element = columns[iColumn]->getElements();
    size += n;
    int i;
    for (i=0;i<n;i++) {
      if (fabs(element[i])!=1.0)
	numberBad++;
    }
  }
  if (numberBad)
    throw CoinError("Not +- 1", "appendCols", "ClpPlusMinusOneMatrix");
  // Get rid of temporary arrays
  delete [] lengths_;
  lengths_=NULL;
  delete matrix_;
  matrix_= NULL;
  int numberNow = startPositive_[numberColumns_];
  CoinBigIndex * temp;
  temp = new CoinBigIndex [numberColumns_+1+number];
  CoinMemcpyN(startPositive_,(numberColumns_+1),temp);
  delete [] startPositive_;
  startPositive_= temp;
  temp = new CoinBigIndex [numberColumns_+number];
  CoinMemcpyN(startNegative_,numberColumns_,temp);
  delete [] startNegative_;
  startNegative_= temp;
  int * temp2 = new int [numberNow+size];
  CoinMemcpyN(indices_,numberNow,temp2);
  delete [] indices_;
  indices_= temp2;
  // now add
  size=numberNow;
  for (iColumn=0;iColumn<number;iColumn++) {
    int n=columns[iColumn]->getNumElements();
    const int * row = columns[iColumn]->getIndices();
    const double * element = columns[iColumn]->getElements();
    int i;
    for (i=0;i<n;i++) {
      if (element[i]==1.0) 
	indices_[size++]=row[i];
    }
    startNegative_[iColumn+numberColumns_]=size;
    for (i=0;i<n;i++) {
      if (element[i]==-1.0) 
	indices_[size++]=row[i];
    }
    startPositive_[iColumn+numberColumns_+1]=size;
  }
  
  numberColumns_ += number;
}
// Append Rows
void 
ClpPlusMinusOneMatrix::appendRows(int number, const CoinPackedVectorBase * const * rows)
{
  // Allocate arrays to use for counting
  int * countPositive = new int [numberColumns_+1];
  memset(countPositive,0,numberColumns_*sizeof(int));
  int * countNegative = new int [numberColumns_];
  memset(countNegative,0,numberColumns_*sizeof(int));
  int iRow;
  CoinBigIndex size=0;
  int numberBad=0;
  for (iRow=0;iRow<number;iRow++) {
    int n=rows[iRow]->getNumElements();
    const int * column = rows[iRow]->getIndices();
    const double * element = rows[iRow]->getElements();
    size += n;
    int i;
    for (i=0;i<n;i++) {
      int iColumn = column[i];
      if (element[i]==1.0)
	countPositive[iColumn]++;
      else if (element[i]==-1.0)
	countNegative[iColumn]++;
      else
	numberBad++;
    }
  }
  if (numberBad)
    throw CoinError("Not +- 1", "appendRows", "ClpPlusMinusOneMatrix");
  // Get rid of temporary arrays
  delete [] lengths_;
  lengths_=NULL;
  delete matrix_;
  matrix_= NULL;
  int numberNow = startPositive_[numberColumns_];
  int * newIndices = new int [numberNow+size];
  // Update starts and turn counts into positions
  // also move current indices
  int iColumn;
  CoinBigIndex numberAdded=0;
  for (iColumn=0;iColumn<numberColumns_;iColumn++) {
    int n,move;
    CoinBigIndex now;
    now = startPositive_[iColumn];
    move = startNegative_[iColumn]-now;
    n = countPositive[iColumn];
    startPositive_[iColumn] += numberAdded;
    CoinMemcpyN(newIndices+startPositive_[iColumn],move,indices_+now);
    countPositive[iColumn]= startNegative_[iColumn]+numberAdded;
    numberAdded += n;
    now = startNegative_[iColumn];
    move = startPositive_[iColumn+1]-now;
    n = countNegative[iColumn];
    startNegative_[iColumn] += numberAdded;
    CoinMemcpyN(newIndices+startNegative_[iColumn],move,indices_+now);
    countNegative[iColumn]= startPositive_[iColumn+1]+numberAdded;
    numberAdded += n;
  }
  delete [] indices_;
  indices_ = newIndices;
  startPositive_[numberColumns_] += numberAdded;
  // Now put in
  for (iRow=0;iRow<number;iRow++) {
    int newRow = numberRows_+iRow;
    int n=rows[iRow]->getNumElements();
    const int * column = rows[iRow]->getIndices();
    const double * element = rows[iRow]->getElements();
    int i;
    for (i=0;i<n;i++) {
      int iColumn = column[i];
      int put;
      if (element[i]==1.0) {
	put = countPositive[iColumn];
	countPositive[iColumn] = put+1;
      } else {
	put = countNegative[iColumn];
	countNegative[iColumn] = put+1;
      }
      indices_[put]=newRow;
    }
  }
  delete [] countPositive;
  delete [] countNegative;
  numberRows_ += number;
}
/* Returns largest and smallest elements of both signs.
   Largest refers to largest absolute value.
*/
void 
ClpPlusMinusOneMatrix::rangeOfElements(double & smallestNegative, double & largestNegative,
		       double & smallestPositive, double & largestPositive)
{
  int iColumn;
  bool plusOne=false;
  bool minusOne=false;
  for (iColumn=0;iColumn<numberColumns_;iColumn++) {
    if (startNegative_[iColumn]>startPositive_[iColumn])
      plusOne=true;
    if (startPositive_[iColumn+1]>startNegative_[iColumn])
      minusOne=true;
  }
  if (minusOne) {
    smallestNegative=-1.0;
    largestNegative=-1.0;
  } else {
    smallestNegative=0.0;
    largestNegative=0.0;
  }
  if (plusOne) {
    smallestPositive=1.0;
    largestPositive=1.0;
  } else {
    smallestPositive=0.0;
    largestPositive=0.0;
  }
}
// Says whether it can do partial pricing
bool 
ClpPlusMinusOneMatrix::canDoPartialPricing() const
{
  return true;
}
// Partial pricing 
void 
ClpPlusMinusOneMatrix::partialPricing(ClpSimplex * model, double startFraction, double endFraction,
			      int & bestSequence, int & numberWanted)
{
  numberWanted=currentWanted_;
  int start = static_cast<int> (startFraction*numberColumns_);
  int end = CoinMin(static_cast<int> (endFraction*numberColumns_+1),numberColumns_);
  CoinBigIndex j;
  double tolerance=model->currentDualTolerance();
  double * reducedCost = model->djRegion();
  const double * duals = model->dualRowSolution();
  const double * cost = model->costRegion();
  double bestDj;
  if (bestSequence>=0)
    bestDj = fabs(reducedCost[bestSequence]);
  else
    bestDj=tolerance;
  int sequenceOut = model->sequenceOut();
  int saveSequence = bestSequence;
  int iSequence;
  for (iSequence=start;iSequence<end;iSequence++) {
    if (iSequence!=sequenceOut) {
      double value;
      ClpSimplex::Status status = model->getStatus(iSequence);
      
      switch(status) {

      case ClpSimplex::basic:
      case ClpSimplex::isFixed:
	break;
      case ClpSimplex::isFree:
      case ClpSimplex::superBasic:
	value=cost[iSequence];
	j=startPositive_[iSequence];
	for (;j<startNegative_[iSequence];j++) {
	  int iRow = indices_[j];
	  value -= duals[iRow];
	}
	for (;j<startPositive_[iSequence+1];j++) {
	  int iRow = indices_[j];
	  value += duals[iRow];
	}
	value = fabs(value);
	if (value>FREE_ACCEPT*tolerance) {
	  numberWanted--;
	  // we are going to bias towards free (but only if reasonable)
	  value *= FREE_BIAS;
	  if (value>bestDj) {
	    // check flagged variable and correct dj
	    if (!model->flagged(iSequence)) {
	      bestDj=value;
	      bestSequence = iSequence;
	    } else {
	      // just to make sure we don't exit before got something
	      numberWanted++;
	    }
	  }
	}
	break;
      case ClpSimplex::atUpperBound:
	value=cost[iSequence];
	j=startPositive_[iSequence];
	for (;j<startNegative_[iSequence];j++) {
	  int iRow = indices_[j];
	  value -= duals[iRow];
	}
	for (;j<startPositive_[iSequence+1];j++) {
	  int iRow = indices_[j];
	  value += duals[iRow];
	}
	if (value>tolerance) {
	  numberWanted--;
	  if (value>bestDj) {
	    // check flagged variable and correct dj
	    if (!model->flagged(iSequence)) {
	      bestDj=value;
	      bestSequence = iSequence;
	    } else {
	      // just to make sure we don't exit before got something
	      numberWanted++;
	    }
	  }
	}
	break;
      case ClpSimplex::atLowerBound:
	value=cost[iSequence];
	j=startPositive_[iSequence];
	for (;j<startNegative_[iSequence];j++) {
	  int iRow = indices_[j];
	  value -= duals[iRow];
	}
	for (;j<startPositive_[iSequence+1];j++) {
	  int iRow = indices_[j];
	  value += duals[iRow];
	}
	value = -value;
	if (value>tolerance) {
	  numberWanted--;
	  if (value>bestDj) {
	    // check flagged variable and correct dj
	    if (!model->flagged(iSequence)) {
	      bestDj=value;
	      bestSequence = iSequence;
	    } else {
	      // just to make sure we don't exit before got something
	      numberWanted++;
	    }
	  }
	}
	break;
      }
    }
    if (!numberWanted)
      break;
  }
  if (bestSequence!=saveSequence) {
    // recompute dj
    double value=cost[bestSequence];
    j=startPositive_[bestSequence];
    for (;j<startNegative_[bestSequence];j++) {
      int iRow = indices_[j];
      value -= duals[iRow];
    }
    for (;j<startPositive_[bestSequence+1];j++) {
      int iRow = indices_[j];
      value += duals[iRow];
    }
    reducedCost[bestSequence] = value;
    savedBestSequence_ = bestSequence;
    savedBestDj_ = reducedCost[savedBestSequence_];
  }
  currentWanted_=numberWanted;
}
// Allow any parts of a created CoinMatrix to be deleted
void 
ClpPlusMinusOneMatrix::releasePackedMatrix() const 
{
  delete matrix_;
  delete [] lengths_;
  matrix_=NULL;
  lengths_=NULL;
}
/* Returns true if can combine transposeTimes and subsetTransposeTimes
   and if it would be faster */
bool 
ClpPlusMinusOneMatrix::canCombine(const ClpSimplex * model,
                            const CoinIndexedVector * pi) const
{
  int numberInRowArray = pi->getNumElements();
  int numberRows = model->numberRows();
  bool packed = pi->packedMode();
  // factor should be smaller if doing both with two pi vectors 
  double factor = 0.27;
  // We may not want to do by row if there may be cache problems
  // It would be nice to find L2 cache size - for moment 512K
  // Be slightly optimistic
  if (numberColumns_*sizeof(double)>1000000) {
    if (numberRows*10<numberColumns_)
      factor *= 0.333333333;
    else if (numberRows*4<numberColumns_)
      factor *= 0.5;
    else if (numberRows*2<numberColumns_)
      factor *= 0.66666666667;
    //if (model->numberIterations()%50==0)
    //printf("%d nonzero\n",numberInRowArray);
  }
  // if not packed then bias a bit more towards by column
  if (!packed)
    factor *= 0.9;
  return (numberInRowArray>factor*numberRows||!model->rowCopy());
}
// These have to match ClpPrimalColumnSteepest version
#define reference(i)  (((reference[i>>5]>>(i&31))&1)!=0)
// Updates two arrays for steepest 
void 
ClpPlusMinusOneMatrix::transposeTimes2(const ClpSimplex * model,
                                 const CoinIndexedVector * pi1, CoinIndexedVector * dj1,
                                 const CoinIndexedVector * pi2,
                                 CoinIndexedVector * spare,
                                 double referenceIn, double devex,
                                 // Array for exact devex to say what is in reference framework
                                 unsigned int * reference,
                                 double * weights, double scaleFactor)
{
  // put row of tableau in dj1
  double * pi = pi1->denseVector();
  int numberNonZero=0;
  int * index = dj1->getIndices();
  double * array = dj1->denseVector();
  int numberInRowArray = pi1->getNumElements();
  double zeroTolerance = model->zeroTolerance();
  bool packed = pi1->packedMode();
  // do by column
  int iColumn;
  assert (!spare->getNumElements());
  double * piWeight = pi2->denseVector();
  assert (!pi2->packedMode());
  bool killDjs = (scaleFactor==0.0);
  if (!scaleFactor)
    scaleFactor=1.0;
  // Note scale factor was -1.0
  if (packed) {
    // need to expand pi into y
    assert(spare->capacity()>=model->numberRows());
    double * piOld = pi;
    pi = spare->denseVector();
    const int * whichRow = pi1->getIndices();
    int i;
    // modify pi so can collapse to one loop
    for (i=0;i<numberInRowArray;i++) {
      int iRow = whichRow[i];
      pi[iRow]=piOld[i];
    }
    CoinBigIndex j;
    for (iColumn=0;iColumn<numberColumns_;iColumn++) {
      ClpSimplex::Status status = model->getStatus(iColumn);
      if (status==ClpSimplex::basic||status==ClpSimplex::isFixed) continue;
      double value = 0.0;
      for (j=startPositive_[iColumn];j<startNegative_[iColumn];j++) {
        int iRow = indices_[j];
        value -= pi[iRow];
      }
      for (;j<startPositive_[iColumn+1];j++) {
        int iRow = indices_[j];
        value += pi[iRow];
      }
      if (fabs(value)>zeroTolerance) {
        // and do other array
        double modification = 0.0;
        for (j=startPositive_[iColumn];j<startNegative_[iColumn];j++) {
          int iRow = indices_[j];
          modification += piWeight[iRow];
        }
        for (;j<startPositive_[iColumn+1];j++) {
          int iRow = indices_[j];
          modification -= piWeight[iRow];
        }
        double thisWeight = weights[iColumn];
        double pivot = value*scaleFactor;
        double pivotSquared = pivot * pivot;
        thisWeight += pivotSquared * devex + pivot * modification;
        if (thisWeight<DEVEX_TRY_NORM) {
          if (referenceIn<0.0) {
            // steepest
            thisWeight = CoinMax(DEVEX_TRY_NORM,DEVEX_ADD_ONE+pivotSquared);
          } else {
            // exact
            thisWeight = referenceIn*pivotSquared;
            if (reference(iColumn))
              thisWeight += 1.0;
            thisWeight = CoinMax(thisWeight,DEVEX_TRY_NORM);
          }
        }
        weights[iColumn] = thisWeight;
        if (!killDjs) {
          array[numberNonZero]=value;
          index[numberNonZero++]=iColumn;
        }
      }
    }
    // zero out
    for (i=0;i<numberInRowArray;i++) {
      int iRow = whichRow[i];
      pi[iRow]=0.0;
    }
  } else {
    CoinBigIndex j;
    for (iColumn=0;iColumn<numberColumns_;iColumn++) {
      ClpSimplex::Status status = model->getStatus(iColumn);
      if (status==ClpSimplex::basic||status==ClpSimplex::isFixed) continue;
      double value = 0.0;
      for (j=startPositive_[iColumn];j<startNegative_[iColumn];j++) {
        int iRow = indices_[j];
        value -= pi[iRow];
      }
      for (;j<startPositive_[iColumn+1];j++) {
        int iRow = indices_[j];
        value += pi[iRow];
      }
      if (fabs(value)>zeroTolerance) {
        // and do other array
        double modification = 0.0;
        for (j=startPositive_[iColumn];j<startNegative_[iColumn];j++) {
          int iRow = indices_[j];
          modification += piWeight[iRow];
        }
        for (;j<startPositive_[iColumn+1];j++) {
          int iRow = indices_[j];
          modification -= piWeight[iRow];
        }
        double thisWeight = weights[iColumn];
        double pivot = value*scaleFactor;
        double pivotSquared = pivot * pivot;
        thisWeight += pivotSquared * devex + pivot * modification;
        if (thisWeight<DEVEX_TRY_NORM) {
          if (referenceIn<0.0) {
            // steepest
            thisWeight = CoinMax(DEVEX_TRY_NORM,DEVEX_ADD_ONE+pivotSquared);
          } else {
            // exact
            thisWeight = referenceIn*pivotSquared;
            if (reference(iColumn))
              thisWeight += 1.0;
            thisWeight = CoinMax(thisWeight,DEVEX_TRY_NORM);
          }
        }
        weights[iColumn] = thisWeight;
        if (!killDjs) {
          array[iColumn]=value;
          index[numberNonZero++]=iColumn;
        }
      }
    }
  }
  dj1->setNumElements(numberNonZero);
  spare->setNumElements(0);
  if (packed)
    dj1->setPackedMode(true);
}
// Updates second array for steepest and does devex weights
void 
ClpPlusMinusOneMatrix::subsetTimes2(const ClpSimplex * ,
                              CoinIndexedVector * dj1,
                            const CoinIndexedVector * pi2, CoinIndexedVector *,
                            double referenceIn, double devex,
                            // Array for exact devex to say what is in reference framework
                            unsigned int * reference,
                            double * weights, double scaleFactor)
{
  int number = dj1->getNumElements();
  const int * index = dj1->getIndices();
  double * array = dj1->denseVector();
  assert( dj1->packedMode());

  double * piWeight = pi2->denseVector();
  bool killDjs = (scaleFactor==0.0);
  if (!scaleFactor)
    scaleFactor=1.0;
  for (int k=0;k<number;k++) {
    int iColumn = index[k];
    double pivot = array[k]*scaleFactor;
    if (killDjs)
      array[k]=0.0;
    // and do other array
    double modification = 0.0;
    CoinBigIndex j;
    for (j=startPositive_[iColumn];j<startNegative_[iColumn];j++) {
      int iRow = indices_[j];
      modification += piWeight[iRow];
    }
    for (;j<startPositive_[iColumn+1];j++) {
      int iRow = indices_[j];
      modification -= piWeight[iRow];
    }
    double thisWeight = weights[iColumn];
    double pivotSquared = pivot * pivot;
    thisWeight += pivotSquared * devex + pivot * modification;
    if (thisWeight<DEVEX_TRY_NORM) {
      if (referenceIn<0.0) {
        // steepest
        thisWeight = CoinMax(DEVEX_TRY_NORM,DEVEX_ADD_ONE+pivotSquared);
      } else {
        // exact
        thisWeight = referenceIn*pivotSquared;
        if (reference(iColumn))
          thisWeight += 1.0;
        thisWeight = CoinMax(thisWeight,DEVEX_TRY_NORM);
      }
    }
    weights[iColumn] = thisWeight;
  }
}
/* Set the dimensions of the matrix. In effect, append new empty
   columns/rows to the matrix. A negative number for either dimension
   means that that dimension doesn't change. Otherwise the new dimensions
   MUST be at least as large as the current ones otherwise an exception
   is thrown. */
void 
ClpPlusMinusOneMatrix::setDimensions(int newnumrows, int newnumcols)
{
  if (newnumrows < 0)
    newnumrows = numberRows_;
  if (newnumrows < numberRows_)
    throw CoinError("Bad new rownum (less than current)",
		    "setDimensions", "CoinPackedMatrix");

  if (newnumcols < 0)
    newnumcols = numberColumns_;
  if (newnumcols < numberColumns_)
    throw CoinError("Bad new colnum (less than current)",
		    "setDimensions", "CoinPackedMatrix");

  int number = 0;
  int length = 0;
  if (columnOrdered_) {
    length = numberColumns_;
    numberColumns_ = newnumcols;
    number = numberColumns_;

  } else {
    length = numberRows_;
    numberRows_ = newnumrows;
    number = numberRows_;
  }
  if (number > length) {
    CoinBigIndex * temp;
    int i;
    CoinBigIndex end = startPositive_[length];
    temp = new CoinBigIndex [number+1];
    CoinMemcpyN(startPositive_,(length+1),temp);
    delete [] startPositive_;
    for (i=length+1;i<number+1;i++)
      temp[i]= end;
    startPositive_=temp;
    temp = new CoinBigIndex [number];
    CoinMemcpyN(startNegative_,length,temp);
    delete [] startNegative_;
    for (i=length;i<number;i++)
      temp[i]= end;
    startNegative_=temp;
  }
}
#ifndef SLIM_CLP
/* Append a set of rows/columns to the end of the matrix. Returns number of errors
   i.e. if any of the new rows/columns contain an index that's larger than the
   number of columns-1/rows-1 (if numberOther>0) or duplicates
   If 0 then rows, 1 if columns */
int 
ClpPlusMinusOneMatrix::appendMatrix(int number, int type,
                                    const CoinBigIndex * starts, const int * index,
                                    const double * element, int /*numberOther*/)
{
  int numberErrors=0;
  // make into CoinPackedVector
  CoinPackedVectorBase ** vectors=
    new CoinPackedVectorBase * [number];
  int iVector;
  for (iVector=0;iVector<number;iVector++) {
    int iStart = starts[iVector];
    vectors[iVector] = 
      new CoinPackedVector(starts[iVector+1]-iStart,
                           index+iStart,element+iStart);
  }
  if (type==0) {
    // rows
    appendRows(number,vectors);
  } else {
    // columns
    appendCols(number,vectors);
  }
  for (iVector=0;iVector<number;iVector++) 
    delete vectors[iVector];
  delete [] vectors;
  return numberErrors;
}
#endif
