numpy.empty()

Python numpy.empty(shape, dtype =float，order = ' C ') :返回一个给定形状和类型的新数组，带有随机值。

参数:

-> shape : Number of rows
-> order : C_contiguous or F_contiguous
-> dtype : [optional, float(by Default)] Data type of returned array.  

示例1

# Python Programming illustrating
# numpy.empty method
  
import numpy as geek
  
b = geek.empty(2, dtype = int)
print("Matrix b : \n", b)
  
a = geek.empty([2, 2], dtype = int)
print("\nMatrix a : \n", a)
  
c = geek.empty([3, 3])
print("\nMatrix c : \n", c)

输出:

Matrix b : 
 [         0 1079574528]

Matrix a : 
 [[0 0]
 [0 0]]

Matrix a : 
 [[ 0.  0.  0.]
 [ 0.  0.  0.]
 [ 0.  0.  0.]]

注意:与0不同，empty不会将数组值设置为0，因此可能稍微快一些。