在NumPy数组中获取唯一行时保持顺序

import numpy as np

# 创建一个NumPy数组
arr = np.array([[1, 2, 3],
                [4, 5, 6],
                [1, 2, 3],
                [7, 8, 9]])

# 获取唯一行并保持顺序
unique_rows, unique_indices, inverse_indices = np.unique(arr, axis=0, return_index=True, return_inverse=True)

# 输出唯一行
print("Unique Rows:")
print(unique_rows)

# 输出唯一行在原始数组中的索引位置
print("Indices of Unique Rows:")
print(unique_indices)

# 输出原始数组中每个元素在唯一值数组中的索引位置
print("Inverse Indices:")
print(inverse_indices)

Unique Rows:
[[1 2 3]
 [4 5 6]
 [7 8 9]]
Indices of Unique Rows:
[0 1 3]
Inverse Indices:
[0 1 0 2]