python numpy 数组拼接

我就写一下我遇到的，更多具体的请看Python之Numpy数组拼接，组合，连接

>>> a
array(［0, 1, 2],
       [3, 4, 5],
       [6, 7, 8］)
>>> b = a*2
>>> b
array(［ 0, 2, 4],
       [ 6, 8, 10],
       [12, 14, 16］)

1.水平组合
>>> np.hstack((a,b))
array(［ 0, 1, 2, 0, 2, 4],
       [ 3, 4, 5, 6, 8, 10],
       [ 6, 7, 8, 12, 14, 16］)
>>> np.concatenate((a,b),axis=1)
array(［ 0, 1, 2, 0, 2, 4],
       [ 3, 4, 5, 6, 8, 10],
       [ 6, 7, 8, 12, 14, 16］)

2.垂直组合
>>> np.vstack((a,b))
array(［ 0, 1, 2],
       [ 3, 4, 5],
       [ 6, 7, 8],
       [ 0, 2, 4],
       [ 6, 8, 10],
       [12, 14, 16］)
>>> np.concatenate((a,b),axis=0)
array(［ 0, 1, 2],
       [ 3, 4, 5],
       [ 6, 7, 8],
       [ 0, 2, 4],
       [ 6, 8, 10],
       [12, 14, 16］)