python tableau 2d

1>>> u = np.arange(1, 16)
2>>> u
3array([ 1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14, 15])
4>>> np.shape(u)
5(15,)
6>>> u.shape = (3, 5)
7>>> u
8array([[ 1,  2,  3,  4,  5],
9       [ 6,  7,  8,  9, 10],
10       [11, 12, 13, 14, 15]])
11>>> np.shape(u)
12(3, 5)
13