努比。Python中的zeros()

这个 努比。零() 函数返回给定形状和类型的新数组,其中包含零。 语法:

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numpy.zeros(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(byDeafult)] Data type of returned array.  

返回:

ndarray of zeros having given shape, order and datatype.

代码1:

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


输出:

Matrix b : 
 [0 0]

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

Matrix c : 
 [[ 0.  0.  0.]
 [ 0.  0.  0.]
 [ 0.  0.  0.]]

代码2:操作数据类型

# Python Program illustrating
# numpy.zeros method
import numpy as geek
# manipulation with data-types
b = geek.zeros(( 2 ,), dtype = [( 'x' , 'float' ), ( 'y' , 'int' )])
print (b)


输出:

[(0.0, 0) (0.0, 0)]

参考: https://docs.scipy.org/doc/numpy-dev/reference/generated/numpy.zeros.html#numpy.zeros 注: 与零和空不同,零不会分别将数组值设置为零或随机值。此外,这些代码不会在online-ID上运行。请在您的系统上运行它们以探索工作环境。

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