如何在numpy array尾部增加一行

用np.vstack就可以了

np.vstack([a, new_row])

例如

>>> a
array([[1, 2, 3],
       [4, 5, 6],
       [7, 8, 9]])
>>> new_row = [1, 5, 9]
>>> b = np.vstack([a, new_row])
>>> b
array([[1, 2, 3],
       [4, 5, 6],
       [7, 8, 9],
       [1, 5, 9]])

>>> import numpy as np
>>> a=np.array([[1,2],[3,4]])
>>> b=np.array([[5,6],[7,8]])
>>> c=np.concatenate((a,b),axis=0)
>>> c
array([[1, 2],
       [3, 4],
       [5, 6],
       [7, 8]])
>>> c=np.concatenate((a,b),axis=1)
>>> c
array([[1, 2, 5, 6],
       [3, 4, 7, 8]])
>>>