iZinked/HHN/%C3%9C2/src/Matrix.java

/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */

/**
 *
 * @author LH
 */
public class Matrix
{
    
    private double[][] matrixdata;
    
    public Matrix(int height, int width)
    {
        matrixdata = new double[height][width];
    }
    
    public double getEntry(int height,int width)
    {
        
        return matrixdata[height-1][width-1];
    }
    
    
    public void setEntry(int height,int width,double value)
    {
        matrixdata[height-1][width-1]=value;
    }
    
    public int getHeight()
    {
        return matrixdata.length;
    }
    
    public int getWidth()
    {
        if(getHeight()>0)
        {
            return matrixdata[0].length;
        }
        return 0;//wenn keine zeilen dann auch keine spalten....
    }
    
    public Matrix add(Matrix m2)
    {
        
        if(m2.getHeight()==getHeight()&&m2.getWidth()==getWidth())
        {
            int height = getHeight();
            int width = getWidth();
            int cells = height*width;
            Matrix o = new Matrix(height,width);
            for (int i = 0; i < cells; i++)
            {
                
                
                int row = i/width+1;
                int col = i%width+1;
                o.setEntry(row,col, m2.getEntry(row, col)+getEntry(row, col));
            }
            return o;
        }
        return null;//keine add mögl
    }
    
    public Matrix multiply(Matrix m2)
    {
        
        if(m2.getHeight()==getWidth())
        {
            
            int height = getHeight();
            int width = m2.getWidth();
            Matrix o = new Matrix(height,m2.getWidth());
            for (int i = 0; i < height; i++)
            {
                for (int j = 0; j <width; j++)
                {
                    double cc = 0;
                    for (int k = 0; k < getWidth(); k++)
                    {
                        System.out.print((i+1)+"|"+(j+1)+"|"+(k+1));
                        double mt = m2.getEntry(k+1,j+1);
                        cc=cc+(getEntry(i+1, k+1)*mt);
                        System.out.println("|"+mt+"|"+cc);
                    }
                    o.setEntry(i+1, j+1, cc);
                }
            }
            return o;
        }
        return null;//keine add mögl
    }
    
    
    public String toString()
    {
        String result = "";
        String zeile = "";
        String klammerauf= "│",klammerzu="│";
        for (int i = 0; i < matrixdata.length; i++)
        {
            klammerauf= "│";
            klammerzu="│";
            if(i==matrixdata.length-1)
            {
                klammerauf="└";
                klammerzu="┘";
            }
            if(i==0)
            {
                klammerauf="┌";
                klammerzu="┐";
            }
            double[] linedata = matrixdata[i];
            zeile=klammerauf;
            for (double zelle : linedata)
            {
                zeile+=zelle+"\t";
            }
            
            zeile=zeile.trim();
            zeile+=klammerzu;
            result+=zeile+"\n";
        }
 
        return result;
    }
    
    
    
    public static void main(String[] args) throws Exception
    {
        Matrix m = new Matrix(4,4);
        
        
        m.setEntry(1, 1, 0);
        m.setEntry(1, 2, 1);
        m.setEntry(1, 3, 0);
        m.setEntry(1, 4, 0);
        
        m.setEntry(2, 1, 0);
        m.setEntry(2, 2, 0);
        m.setEntry(2, 3, 1);
        m.setEntry(2, 4, 0);
        
        m.setEntry(3, 1, 0);
        m.setEntry(3, 2, 0);
        m.setEntry(3, 3, 1);
        m.setEntry(3, 4, 0);
        
        m.setEntry(4, 1, -1);
        m.setEntry(4, 2, 1);
        m.setEntry(4, 3, -1);
        m.setEntry(4, 4, 3);
        InteractiveIO.write(m.multiply(m)+"");
    }
    
}