如何从NumPy数组中删除特定元素

# import numpy as np
import numpy as np
 
# create an array with 5 elements
a = np.array([1, 2, 3, 4, 5])
 
# display a
print(a)
 
# delete 1 st element
print("remaining elements after deleting 1st element ",
      np.delete(a, 0))

[1 2 3 4 5]
remaining elements after deleting 1st element  [2 3 4 5]

# import numpy as np
import numpy as np
 
# create an array with 5
# elements
a = np.array([1, 2, 3, 4, 5])
 
# display a
print(a)
 
# delete 1st element and 5th element
print("remaining elements after deleting 1st and last element ",
      np.delete(a, [0, 4]))

[1 2 3 4 5]
remaining elements after deleting 1st and last element  [2 3 4]

import numpy as np
arr_1D = np.array([1 ,2, 3, 4, 5, 6, 7, 8])
 
arr_1D = np.delete(arr_1D, np.where(arr_1D == 8))
print(arr_1D)

[1 2 3 4 5 6 7]

import numpy as np
# numpy array
arr = np.array([9, 8, 7, 6, 5, 4, 3, 2, 1])
 
# index array with index of all the elements, except index = 5.
# so element at 5th index will be deleted.
indexArray = [0, 1, 2, 3, 4, 6, 7, 8]
 
# passing indexarray to the array as index
arr = arr[indexArray]
 
print(arr)

[9 8 7 6 5 3 2 1]

import numpy as np
arr = np.array([[1 ,2, 3, 4],
                  [5, 6, 7, 8],
                  [9, 10, 11, 12]])
 
print(np.delete(arr, 1, axis=1))

[[ 1  3  4]
 [ 5  7  8]
 [ 9 11 12]]

import numpy as np
arr = np.array([[1 ,2, 3, 4],
                  [5, 6, 7, 8],
                  [9, 10, 11, 12]])
 
print(np.delete(arr, 1, axis=0))

[[ 1  2  3  4]
 [ 9 10 11 12]]

arr = np.delete(arr, [0,3], axis=1)
print(arr)

[[ 2  3]
 [ 6  7]
 [10 11]]