Numpy maskearray . resize()函数| Python
原文:https://www . geeksforgeeks . org/numpy-masked array-resize-function-python/
numpy.MaskedArray.resize() 函数用于从给定数组中创建一个具有指定大小和形状的新掩码数组。新数组填充了 arr 的重复副本(按照数据存储在内存中的顺序)。如果 arr 被屏蔽，新数组将被屏蔽，新掩码将是旧数组的重复。
语法:
numpy.ma.resize(arr, new_shape)参数: arr: 要调整大小的输入数组。 new _ shape:【int 或 int 元组】调整大小数组的新形状。
返回:【调整大小 _ 数组】数组的新形状。
代码#1 :
# Python program explaining
# numpy.MaskedArray.resize() method
# importing numpy as geek
# and numpy.ma module as ma
import numpy as geek
import numpy.ma as ma
# creating input array of 2 * 2
in_arr = geek.array([[10, 20], [-10, 40]])
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 ("Masked array : ", mask_arr)
# applying MaskedArray.resize methods to make
# it a 3 * 3 masked array
out_arr = ma.resize(mask_arr, (3, 3))
print ("Output resized masked array : ", out_arr)
Output:
Input array : [[ 10 20]
[-10 40]]
Masked array : [[-- 20]
[-10 40]]
Output resized masked array : [[-- 20 -10]
[40 -- 20]
[-10 40 --]]
代码#2 :
# Python program explaining
# numpy.MaskedArray.resize() 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]], [[ -4e-6, 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 ("Masked array : ", mask_arr)
# applying MaskedArray.resize methods to make
# it a 1 * 6 masked array
out_arr = ma.resize(mask_arr, (1, 6))
print ("Output resized masked array : ", out_arr)
Output:
Input array : [[[ 2.e+08 3.e-05]]
[[-4.e-06 2.e+05]]]
Masked array : [[[-- 3e-05]]
[[-4e-06 200000.0]]]
Output resized masked array : [[-- 3e-05 -4e-06 200000.0 -- 3e-05]]
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