行向量
方式1
import numpy as np b=np.array([1,2,3]).reshape((1,-1)) print(b,b.shape)
结果:
(array([[1, 2, 3]]), (1, 3))
方式2
import numpy as np b=np.array([[1,2,3]]) #两层'[]' print(b,b.shape)
结果
(array([[1, 2, 3]]), (1, 3))
列向量
方式1
import numpy as np a=np.array([1,2,3]).reshape((-1,1)) print(a,a.shape)
结果:
(array([[1], [2], [3]]), (3, 1))
方式2
import numpy as np a=np.array([[1,2,3]]).T print(a,a.shape)
结果
(array([[1], [2], [3]]), (3, 1))