Python–Numpy 数组列删除
原文:https://www . geesforgeks . org/python-numpy-array-column-delete/
给定一个 numpy 数组，编写一个程序从 numpy 数组中删除列。
示例–
Input: [['akshat', 'nikhil'], ['manjeeet', 'akash']]
Output: [['akshat']['manjeeet']]
Input: [[1, 0, 0, 1, 0], [0, 1, 2, 1, 1]]
Output: [[1 0 1 0][0 2 1 1]]
下面给出了从 numpy 数组中删除列的各种方法。
方法#1:使用 np.delete()
# Python code to demonstrate
# deletion of columns from numpy array
import numpy as np
# initialising numpy array
ini_array = np.array([[1, 0, 0, 1, 0],
[0, 1, 2, 1, 1]])
# deleting second column from array
result = np.delete(ini_array, 1, 1)
# print result
print ("Resultant Array :"+str(result))
输出:
Resultant Array :[[1 0 1 0]
[0 2 1 1]]
方法 2:使用压缩()和逻辑 _ 非()
# Python code to demonstrate
# deletion of columns from numpy array
import numpy as np
# initialising numpy array
ini_array = np.array([[1, 0, 0, 1, 0], [1, 2, 0, 0, 1]])
z = [False, True, False, False, False]
# deleting second column from array
result = ini_array.compress(np.logical_not(z), axis = 1)
# print result
print ("Resultant Array :"+str(result))
输出:
Resultant Array :[[1 0 1 0]
[1 0 0 1]]
方法#3:使用 logical_not()
# Python code to demonstrate
# deletion of columns from numpy array
import numpy as np
# initialising numpy array
ini_array = np.array([[1, 0, 0, 1, 0], [1, 2, 0, 0, 1]])
z = [False, True, False, False, False]
# deleting second column from array
result = ini_array[:, np.logical_not(z)]
# print result
print ("Resultant Array :"+str(result))
输出:
Resultant Array :[[1 0 1 0]
[1 0 0 1]]
