Numpy maskedarray . default _ fill _ value()函数| Python
原文:https://www . geesforgeks . org/numpy-masked array-default _ fill _ value-function-python/
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。如果数据类型是 bool，那么缺省填充值是 True，对于 int 是 999999，对于 float 是 1.e20，对于 complex 是 1.e20+0.j，'？'对象为，字符串为“不适用”。
语法:
numpy.ma.default_fill_value(obj)参数: 对象:【n 数组、数据类型或标量】返回默认填充值的数组数据类型或标量。
返回:【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)
Output:
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)
Output:
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)
