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Python Numpy MaskedArray.default_fill_value()用法及代码示例


numpy.MaskedArray.default_fill_value()函数用于返回参数对象的默认填充值。默认填充值取决于输入数组的数据类型或输入标量的类型。如果数据类型为bool,则默认填充值为True,对于int,它是999999,对于浮点数是1.e20,对于复杂,它是1.e20 + 0.j,对于对象来说是'?',对于字符串来说是'N /A'。

用法: numpy.ma.default_fill_value(obj)

参数:
obj :[ndarray,dtype或标量]返回其默认填充值的数组数据类型或标量。


Return :[标量]默认填充值。

代码1:

# Python program explaining 
# numpy.MaskedArray.default_fill_value() method  
    
# importing numpy as geek   
# and numpy.ma module as ma  
import numpy as geek  
import numpy.ma as ma  
    
# creating input array   
in_arr = geek.array([[1, 2], [ 3, -1], [ 5, -3]]) 
print ("Input array:", in_arr)  
    
# Now we are creating a masked array.  
# by making  entry as invalid.   
mask_arr = ma.masked_array(in_arr, 
     mask =[[1, 0], [ 1, 0], [ 0, 0]])  
  
print ("Masked array:", mask_arr)  
    
# applying MaskedArray.default_fill_value     
# methods to masked array 
out_val = ma.default_fill_value(mask_arr)  
print ("Default filled value:", out_val) 
输出:
Input array: [[ 1  2]
 [ 3 -1]
 [ 5 -3]]
Masked array: [[-- 2]
 [-- -1]
 [5 -3]]
Default filled value: 999999

代码2:

# Python program explaining 
# numpy.MaskedArray.default_fill_value() method  
    
# importing numpy as geek   
# and numpy.ma module as ma  
import numpy as geek  
import numpy.ma as ma  
    
# creating input array   
in_arr = geek.array([[1 + 2j, 2 + 3j], 
                     [ 3-2j, -1 + 2j], 
                     [ 5-4j, -3-3j]]) 
print ("Input array:", in_arr)  
    
# Now we are creating a masked array.  
# by making two entry as invalid.   
mask_arr = ma.masked_array(in_arr,  
     mask =[[1, 0], [ 1, 0], [ 0, 0]])  
  
print ("Masked array:", mask_arr)  
  
# applying MaskedArray.default_fill_value     
# methods to masked array 
out_val = ma.default_fill_value(mask_arr)  
print ("Default filled value:", out_val) 
输出:
Input array: [[ 1.+2.j  2.+3.j]
 [ 3.-2.j -1.+2.j]
 [ 5.-4.j -3.-3.j]]
Masked array: [[-- (2+3j)]
 [-- (-1+2j)]
 [(5-4j) (-3-3j)]]
Default filled value: (1e+20+0j)


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注:本文由纯净天空筛选整理自jana_sayantan大神的英文原创作品 Numpy MaskedArray.default_fill_value() function | Python。非经特殊声明,原始代码版权归原作者所有,本译文未经允许或授权,请勿转载或复制。