Numpy ndarray.dot()函数| Python

numpy.ndarray.dot()函数返回两个数组的点积。

Syntax : numpy.ndarray.dot(arr, out=None)

Parameters :
arr : [array_like] Input array.
out : [ndarray, optional] Output argument.

Return : [ndarray] The dot product of two arrays.

代码#1：

# Python program explaining
# numpy.ndarray.dot() function
  
# importing numpy as geek 
import numpy as geek
  
arr1 = geek.eye(3)
arr = geek.ones((3, 3)) * 3
  
gfg = arr1.dot( arr )
  
print( gfg)

输出 ：

[[ 3.  3.  3.]
 [ 3.  3.  3.]
 [ 3.  3.  3.]]

代码#2：

# Python program explaining
# numpy.ndarray.dot() function
  
# importing numpy as geek 
import numpy as geek
  
arr1 = geek.eye(3)
arr = geek.ones((3, 3)) * 3
  
gfg = arr1.dot(arr).dot(arr)
  
print( gfg)

输出 ：

[[ 27.  27.  27.]
 [ 27.  27.  27.]
 [ 27.  27.  27.]]