@Test
	public void test_mult_matrix_identity() {
		int dim = 3;
		
		Matrix a = new MatrixArray(dim, dim);
		Matrix identity_matrix = new MatrixArray(dim, dim);
		
		for(int i = 1; i <= dim; i++){
			for(int j = 1; j <= dim; j++)
				a.insert(i, j, (double)(2*i-j));
		}
		
		for(int i = 1; i <= dim; i++){
			for(int j = 1; j <= dim; j++)
				identity_matrix.insert(i, j, (double)((i == j)?1.0:0.0));
		}
		
		assertEquals(a.mul(identity_matrix),a);
		assertEquals(identity_matrix.mul(a),a);
	}