numpy中关于*和dot的区别

1.numpy乘法运算中"*"是数组元素逐个计算

 

>>> 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乘法运算中dot是按照矩阵乘法的规则来运算的

 

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>>> 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]]) >>>