numpy.MaskedArray.ravel()函数用于返回1D版本的自遮罩数组,作为视图。
用法: numpy.ma.ravel(self, order='C')
参数:
order :[“ C”,“ F”,“ A”,“ K”,可选)默认情况下,使用“ C”索引顺序。
->使用此索引顺序读取a的元素。
->'C'表示以C-like顺序索引元素,最后一个轴索引更改最快,回到第一个轴索引更改最快。
->“ F”表示以Fortran-like索引顺序索引元素,第一个索引更改最快,最后一个索引更改最慢。
->'A'表示如果m在内存中是连续的,则以Fortran-like索引顺序读取元素,否则以C-like顺序读取元素。
->“ K”表示按顺序在内存中读取元素,但当步幅为负时反转数据。
Return :[MaskedArray]展平的1D蒙版数组。
代码1:
# Python program explaining
# numpy.MaskedArray.ravel() 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]])
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 =[[0, 1], [ 1, 0]])
print ("Masked array:", mask_arr)
# applying MaskedArray.ravel methods to mask array
out_arr = mask_arr.ravel()
print ("1D view of masked array:", out_arr)
输出:
Input array: [[ 1 2] [ 3 -1]] Masked array: [[1 --] [-- -1]] 1D view of masked array: [1 -- -- -1]
代码2:
# Python program explaining
# numpy.MaskedArray.ravel() 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([[[ 2e8, 3e-5]], [[ -45.0, 2e5]]])
print ("Input array:", in_arr)
# Now we are creating a masked array.
# by making one entry as invalid.
mask_arr = ma.masked_array(in_arr, mask =[[[ 1, 0]], [[ 0, 0]]])
print ("3D Masked array:", mask_arr)
# applying MaskedArray.ravel methods to mask array
out_arr = mask_arr.ravel()
print ("1D view of masked array:", out_arr)
输出:
Input array: [[[ 2.0e+08 3.0e-05]] [[-4.5e+01 2.0e+05]]] 3D Masked array: [[[-- 3e-05]] [[-45.0 200000.0]]] 1D view of masked array: [-- 3e-05 -45.0 200000.0]
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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.ravel() 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。