在numpy中的2d数组中的特定位置插入行? [英] Inserting a row at a specific location in a 2d array in numpy?

问题描述

我在numpy中有一个二维数组，我想在其中插入新行.跟随问题 Numpy-将行添加到数组会有所帮助.我们可以使用numpy.vstack，但是它会在开始或结尾处堆叠.任何人都可以在这方面提供帮助.

I have a 2d array in numpy where I want to insert a new row. Following question Numpy - add row to array can help. We can use numpy.vstack, but it stacks at the start or at the end. Can anyone please help in this regard.

推荐答案

您可能正在寻找

You are probably looking for numpy.insert

>>> import numpy as np
>>> a = np.zeros((2, 2))
>>> a
array([[ 0.,  0.],
       [ 0.,  0.]])
# In the following line 1 is the index before which to insert, 0 is the axis.
>>> np.insert(a, 1, np.array((1, 1)), 0)  
array([[ 0.,  0.],
       [ 1.,  1.],
       [ 0.,  0.]])
>>> np.insert(a, 1, np.array((1, 1)), 1)
array([[ 0.,  1.,  0.],
       [ 0.,  1.,  0.]])

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