package main;

public class Matrix {

	private double[][] matrix = null;
	
	public Matrix(int columns,int rows) {
		setMatrix(new double[columns][rows]);
	}
	
	public double get(int i, int j) {
		return getMatrix()[i][j];
	}
		  
	public void set(int i, int j, double s) {
		getMatrix()[i][j] = s;
	}
	
	public int getColumns() {
	    return getMatrix().length;
	}
	  
	public int getRows() {
		return getMatrix()[0].length;
	}

	public Matrix addiereMatrix(Matrix a) {
		
		int m = getColumns();
		int n = getRows();
		
		Matrix c = new Matrix(m, n);
	    
	    for (int i = 0; i < m; i++) {
	    	for (int j = 0; j < n; j++) {
	    		c.getMatrix()[i][j] = getMatrix()[i][j] + a.getMatrix()[i][j];
	    	}
	    }
	    
	    return c;
	}
	
	public Matrix subtrahiereMatrix(Matrix a) {
		
		int m = getColumns();
		int n = getRows();
		
		Matrix c = new Matrix(m, n);
	    
	    for (int i = 0; i < m; i++) {
	    	for (int j = 0; j < n; j++) {
	    		c.getMatrix()[i][j] = getMatrix()[i][j] - a.getMatrix()[i][j];
	    	}
	    }
	    
	    return c;
	}
	
	public static Matrix multipliziereMatrix(Matrix a,Matrix b) {
		
		int m = a.getColumns();
	    int l = a.getRows();
	    int n = b.getRows();
	    
	    Matrix c = new Matrix(n,m);
	    
	    for (int i = 0; i < m; i++) {
	      for (int j = 0; j < n; j++) {
	        c.getMatrix()[i][j] = 0;
	        for (int k = 0; k < l; k++) {
	          c.getMatrix()[i][j] += a.getMatrix()[i][k] * b.getMatrix()[k][j];
	        }
	      }
	    }
	    
	    return c;
	}
	
	
	
	public String toString() {
		String s = "";
		for (int i = 0; i < getColumns(); i++) {
		    for (int j = 0; j < getColumns(); j++) {
		    	s += getMatrix()[i][j] + ", ";
		    }
		    s += "\n";
		}
		return s;
	}

	public double[][] getMatrix() {
		return matrix;
	}

	public void setMatrix(double[][] matrix) {
		this.matrix = matrix;
	}
}