File: matrix.h

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/***************************************************************************
 SocNetV: Social Networks Visualizer
 version: 0.90
 Written in Qt 4.4

                          matrix.h  -  description
                             -------------------
    copyright            : (C) 2005-2010 by dimitris kalamaras
    email                : dimitris.kalamaras@gmail.com
 ***************************************************************************/


/*******************************************************************************
*     This program is free software: you can redistribute it and/or modify     *
*     it under the terms of the GNU General Public License as published by     *
*     the Free Software Foundation, either version 3 of the License, or        *
*     (at your option) any later version.                                      *
*                                                                              *
*     This program is distributed in the hope that it will be useful,          *
*     but WITHOUT ANY WARRANTY; without even the implied warranty of           *
*     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the            *
*     GNU General Public License for more details.                             *
*                                                                              *
*     You should have received a copy of the GNU General Public License        *
*     along with this program.  If not, see <http://www.gnu.org/licenses/>.    *
********************************************************************************/


#ifndef MATRIX_H
#define MATRIX_H

using namespace std;


#include <QtGlobal>		//used for qDebug function
#include <QDebug>
#include <QTextStream>


class Row {
public:
	Row (int Actors=3000) {
		cell=new  float [m_Actors=Actors];
		Q_CHECK_PTR( cell );
		m_outEdges=0;
	}
	~Row() {delete [] cell;}
	
	Row& operator =(Row & a) {
			if (this != &a){
				if (a.m_Actors!=m_Actors) {
					delete [] cell;
					cell=new  float[m_Actors=a.m_Actors];
					Q_CHECK_PTR( cell);
				}
				for (int i=0;i<m_Actors; i++)
				    cell[i]=a.cell[i];
			}
			return *this;
	}
	
	float column ( int c ) const {
		return cell[c];
	}
	
	void setColumn (int index, float elem) {
		cell[index]=elem;
		if (elem!=0)
			m_outEdges++;
	}

	void clearColumn(int index){
		if (cell[index]!=0)
			m_outEdges--;
		cell[index]=0;
	}	


	//FIXME 
	void updateOutEdges(){
		m_outEdges=0;
		for (int i=0;i<m_Actors; i++) { 
			if (cell[i])
			    m_outEdges++;
		}
	}

	void resize(int Actors) {
		delete [] cell;
		cell=new  float[m_Actors=Actors];
		Q_CHECK_PTR( cell);
		
		for (int i=0;i<m_Actors; i++) { 
			cell[i]=0;
		}
		m_outEdges=0;
	}
	
	void setSize(int Actors){
		m_Actors=Actors;
		//FIXME Matrix.row setSize m_outEdges should be zero
	}
	int outEdges () { return m_outEdges;}

private:
	float *cell;
	int m_Actors, m_outEdges;
};




class Matrix {
	public:
		/**default constructor, not actually used. Use resize(int) */
 		Matrix (int Actors=3000 )   {
			row=new  Row[m_Actors=Actors];
		        Q_CHECK_PTR( row );
		}

		Matrix(const Matrix &b) ;	/* Copy constructor allows Matrix a=b  declaration */

		~Matrix() { delete [] row; }	/* Destructor */

		void setSize (int Actors);	/* Used to set m_Actors */
			
		float item( int r, int c ) ;
		
		void setItem( int r, int c, float elem );
		
		void clearItem( int r, int c ) ;
		
		int cols() {return m_Actors;}
		
		int rows() {return m_Actors;}
	
		void deleteRowColumn(int i);	/* deletes row i and column i */
	
		void resize (int Actors) ;	/* This is called before every operation on new matrixes. */
	

		int edgesFrom(int Actor);

		int edgesTo(int Actor);
		
		int totalEdges();

		bool printMatrixConsole();

		void identityMatrix (int);

		void fillMatrix (float value );	   /* Fulls a matrix with a value */
	
		Matrix& operator =(Matrix & a);	    /* Equals two matrices. */

		float  operator ()  (const int r, const int c) ;
		
		friend QTextStream& operator <<  (QTextStream& os, Matrix& m);

		/** Takes two matrices and returns their product as a reference */
		Matrix & product( Matrix &a, Matrix & b, bool symmetry) ;		
		
		/** Takes two symm. matrices and outputs an upper triangular matrix */
		Matrix & productSym( Matrix &a, Matrix & b)  ;
		
		Matrix & pow (int power, bool symmetry)  ;

		Matrix& subtractFromI () ;

		Matrix& sum (Matrix &a, Matrix &b) ;

		Matrix& inverseByGaussJordanElimination(Matrix &a);

		void swapRows(int rowA,int rowB);		/* elementary matrix algebra */
		void multiplyRow(int row, float value);		/* Multiply every elememt of row A by value */

	private:
		Row *row;
		int m_Actors;
		int *vec;

};





#endif