Python numpy.ma.compress_cols()用法及代碼示例

先決條件：numpy

此numpy內置函數可抑製包含二維數組中包含掩碼值的整個列。

Syntax: numpy.ma.compress_cols(arr)

Parameters:

arr:[array_like, MaskedArray]

This parameter holds the array to operate on.

The array must be a 2D array.

If no array elements are masked, arr is interpreted as a MaskedArray with mask set to nomask.

返回：Returns the compressed array.

下麵是上述函數的實現。

範例1：

Python3

# importing numpy as geek 
import numpy as geek 
  
# defining an array with mask 
arr = geek.ma.array(geek.arange(6).reshape(2, 3), 
                    mask=[[1, 0, 0], [0, 0, 0]]) 
  
# applying mask to array elements 
gfg = geek.ma.compress_cols(arr) 
  
print(gfg)

輸出：

[[1 2]
 [4 5]]

範例2：

Python3

# importing numpy as geek 
import numpy as geek 
  
# defining array 
arr = geek.ma.array(geek.arange(9).reshape(3, 3), mask=[ 
                    [1, 0, 0], [1, 0, 0], [0, 0, 0]]) 
  
# applying mask to array elements 
gfg = geek.ma.compress_cols(arr) 
  
print(gfg)

輸出：

[[1 2]
 [4 5]
 [7 8]]

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