Python中的 numpy.ones()

numpy.ones()函数返回一个给定形状和类型的新数组，其中包含一个。

Syntax: numpy.ones(shape, dtype = None, order = 'C') 

参数 ：

shape : integer or sequence of integers
order  : C_contiguous or F_contiguous
         C-contiguous order in memory(last index varies the fastest)
         C order means that operating row-rise on the array will be slightly quicker
         FORTRAN-contiguous order in memory (first index varies the fastest).
         F order means that column-wise operations will be faster. 
dtype : [optional, float(byDefault)] Data type of returned array.  

返回：

ndarray of ones having given shape, order and datatype.

Python

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

输出 ：

Matrix b : 
 [1 1]

Matrix a : 
 [[1 1]
 [1 1]]

Matrix c : 
 [[ 1.  1.  1.]
 [ 1.  1.  1.]
 [ 1.  1.  1.]]