// Copyright (C) 2003, International Business Machines
// Corporation and others.  All Rights Reserved.
#ifndef ClpNetworkMatrix_H
#define ClpNetworkMatrix_H


#include "CoinPragma.hpp"

#include "ClpMatrixBase.hpp"

/** This implements a simple network matrix as derived from ClpMatrixBase.

If you want more sophisticated version then you could inherit from this.
Also you might want to allow networks with gain */

class ClpNetworkMatrix : public ClpMatrixBase {
  
public:
  /**@name Useful methods */
   //@{
   /// Return a complete CoinPackedMatrix
   virtual CoinPackedMatrix * getPackedMatrix() const;
    /** Whether the packed matrix is column major ordered or not. */
   virtual bool isColOrdered() const { return true; }
   /** Number of entries in the packed matrix. */
  virtual  CoinBigIndex getNumElements() const 
  { return 2*numberColumns_; }
   /** Number of columns. */
   virtual int getNumCols() const { return numberColumns_; }
   /** Number of rows. */
  virtual int getNumRows() const { return numberRows_; }

   /** 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. */
  virtual const double * getElements() const; 
   /** A vector containing the minor indices of 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. */
  virtual const int * getIndices() const
  { return indices_;}

  virtual const CoinBigIndex * getVectorStarts() const;
   /** The lengths of the major-dimension vectors. */
  virtual const int * getVectorLengths() const;

    /** Delete the columns whose indices are listed in <code>indDel</code>. */
  virtual void deleteCols(const int numDel, const int * indDel);
    /** Delete the rows whose indices are listed in <code>indDel</code>. */
  virtual void deleteRows(const int numDel, const int * indDel);
  /// Append Columns
  virtual void appendCols(int number, const CoinPackedVectorBase * const * columns);
  /// Append Rows
  virtual void appendRows(int number, const CoinPackedVectorBase * const * rows);
#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 */
  virtual int appendMatrix(int number, int type,
                           const CoinBigIndex * starts, const int * index,
                           const double * element, int numberOther=-1);
#endif
  /** Returns a new matrix in reverse order without gaps */
  virtual ClpMatrixBase * reverseOrderedCopy() const;
  /// Returns number of elements in column part of basis 
  virtual CoinBigIndex countBasis(ClpSimplex * model,
				 const int * whichColumn, 
				 int numberRowBasic,
				  int & numberColumnBasic);
  /// Fills in column part of basis
  virtual void fillBasis(ClpSimplex * model,
				 const int * whichColumn, 
				 int & numberColumnBasic,
				 int * row, int * start,
				 int * rowCount, int * columnCount,
				 double * element);
  /** Given positive integer weights for each row fills in sum of weights
      for each column (and slack).
      Returns weights vector
  */
  virtual CoinBigIndex * dubiousWeights(const ClpSimplex * model,int * inputWeights) const;
  /** Returns largest and smallest elements of both signs.
      Largest refers to largest absolute value.
  */
  virtual void rangeOfElements(double & smallestNegative, double & largestNegative,
		       double & smallestPositive, double & largestPositive);
  /** Unpacks a column into an CoinIndexedvector
   */
  virtual void unpack(const ClpSimplex * model,CoinIndexedVector * rowArray,
		   int column) const ;
  /** Unpacks a column into an CoinIndexedvector
   ** in packed format
      Note that model is NOT const.  Bounds and objective could
      be modified if doing column generation (just for this variable) */
  virtual void unpackPacked(ClpSimplex * model,
			    CoinIndexedVector * rowArray,
			    int column) const;
  /** Adds multiple of a column into an CoinIndexedvector
      You can use quickAdd to add to vector */
  virtual void add(const ClpSimplex * model,CoinIndexedVector * rowArray,
		   int column, double multiplier) const ;
  /** Adds multiple of a column into an array */
  virtual void add(const ClpSimplex * model,double * array,
		   int column, double multiplier) const;
   /// Allow any parts of a created CoinMatrix to be deleted
   virtual void releasePackedMatrix() const ;
  /// Says whether it can do partial pricing
  virtual bool canDoPartialPricing() const;
  /// Partial pricing 
  virtual void partialPricing(ClpSimplex * model, double start, double end,
		      int & bestSequence, int & numberWanted);
   //@}

  /**@name Matrix times vector methods */
  //@{
    /** Return <code>y + A * scalar *x</code> in <code>y</code>.
        @pre <code>x</code> must be of size <code>numColumns()</code>
        @pre <code>y</code> must be of size <code>numRows()</code> */
  virtual void times(double scalar,
		       const double * x, double * y) const;
  /// And for scaling
  virtual void times(double scalar,
		     const double * x, double * y,
		     const double * rowScale, 
		     const double * columnScale) const;
    /** Return <code>y + x * scalar * A</code> in <code>y</code>.
        @pre <code>x</code> must be of size <code>numRows()</code>
        @pre <code>y</code> must be of size <code>numColumns()</code> */
    virtual void transposeTimes(double scalar,
				const double * x, double * y) const;
  /// And for scaling 
    virtual void transposeTimes(double scalar,
				const double * x, double * y,
				const double * rowScale, 
				const double * columnScale, double * spare=NULL) const;
    /** Return <code>x * scalar * A + y</code> in <code>z</code>. 
	Can use y as temporary array (will be empty at end)
	Note - If x packed mode - then z packed mode
	Squashes small elements and knows about ClpSimplex */
  virtual void transposeTimes(const ClpSimplex * model, double scalar,
			      const CoinIndexedVector * x,
			      CoinIndexedVector * y,
			      CoinIndexedVector * z) const;
    /** Return <code>x *A</code> in <code>z</code> but
	just for indices in y.
	Note - z always packed mode */
  virtual void subsetTransposeTimes(const ClpSimplex * model,
				    const CoinIndexedVector * x,
				    const CoinIndexedVector * y,
				    CoinIndexedVector * z) const;
  //@}

  /**@name Other */
   //@{
  /// Return true if really network, false if has slacks
  inline bool trueNetwork() const
  { return trueNetwork_;}
   //@}


  /**@name Constructors, destructor */
   //@{
   /** Default constructor. */
   ClpNetworkMatrix();
  /** Constructor from two arrays */
  ClpNetworkMatrix(int numberColumns, const int * head,
		   const int * tail);
   /** Destructor */
   virtual ~ClpNetworkMatrix();
   //@}

   /**@name Copy method */
   //@{
   /** The copy constructor. */
   ClpNetworkMatrix(const ClpNetworkMatrix&);
   /** The copy constructor from an CoinNetworkMatrix. */
   ClpNetworkMatrix(const CoinPackedMatrix&);

   ClpNetworkMatrix& operator=(const ClpNetworkMatrix&);
  /// Clone
  virtual ClpMatrixBase * clone() const ;
  /** Subset constructor (without gaps).  Duplicates are allowed
      and order is as given */
  ClpNetworkMatrix (const ClpNetworkMatrix & wholeModel,
		    int numberRows, const int * whichRows,
		    int numberColumns, const int * whichColumns);
  /** Subset clone (without gaps).  Duplicates are allowed
      and order is as given */
  virtual ClpMatrixBase * subsetClone (
		    int numberRows, const int * whichRows,
		    int numberColumns, const int * whichColumns) const ;
   //@}
   
    
protected:
   /**@name Data members
      The data members are protected to allow access for derived classes. */
   //@{
  /// For fake CoinPackedMatrix
  mutable CoinPackedMatrix * matrix_;
  mutable int * lengths_;
  /// Data -1, then +1 rows in pairs (row==-1 if one entry)
  int * indices_;
  /// Number of rows
  int numberRows_;
  /// Number of columns
  int numberColumns_;
  /// True if all entries have two elements
  bool trueNetwork_;
  
   //@}
};

#endif