numpy中關於*和dot的區別

1.numpy乘法運算中"*"是數組元素逐個計算

 

>>> import numpy as np
>>> a = np.array([[2,3],[3,4]])
>>> b = np.array([[3,4],[5,6]])
>>> c = a * b
>>> c
array([[ 6, 12],
       [15, 24]])
>>> 

 

2.numpy乘法運算中dot是按照矩陣乘法的規則來運算的

 

>>> import numpy as np
>>> a = np.array([[2,3],[3,4]])
>>> b = np.array([[3,4],[5,6]])
>>> c = a * b
>>> f = np.dot(a,b)
>>> f
array([[21, 26],
       [29, 36]])
>>>