ClpNetworkMatrix.hpp

/* $Id$ */
// Copyright (C) 2003, International Business Machines
// Corporation and others.  All Rights Reserved.
// This code is licensed under the terms of the Eclipse Public License (EPL).

#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 int countBasis(
    const int *whichColumn,
    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,
    CoinFactorizationDouble *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

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