public int [][] appendMatrix(int[][]matrix, int [][] matrix2)
    {

        this.matrix = new int[matrix.length + matrix2.length][matrix[0].length];
        for(int i = 0; i < matrix.length; i++)
        {
            for(int j = 0; j < matrix[i].length; j++)
            {
                this.matrix[i][j] = matrix[i][j];
            }
            for(int j = matrix.length; j < matrix.length + matrix2.length; j++)
            {
                this.matrix[i][j]= matrix2[i-matrix.length][j];
            }
        }
        return this.matrix;**