问题描述
我有以下numpy数组
I have the following numpy array
import numpy as np
X = np.array([[5.], [4.], [3.], [2.], [1.]])
我想在开头插入[6.]
.我尝试过:
I want to insert [6.]
at the beginning.I've tried:
X = X.insert(X, 0)
如何插入X?
推荐答案
numpy具有insert
函数,该函数可通过np.insert
与文档.
numpy has an insert
function that's accesible via np.insert
with documentation.
在这种情况下,您将想要使用它,就像这样:
You'll want to use it in this case like so:
X = np.insert(X, 0, 6., axis=0)
第一个参数X
指定要插入的对象.
the first argument X
specifies the object to be inserted into.
第二个参数0
指定位置.
第三个参数6.
指定要插入的内容.
The third argument 6.
specifies what is to be inserted.
第四个参数axis=0
指定对于每一列,插入应发生在位置0
处.我们可以选择行,但是您的X是列向量,所以我认为我们会保持一致.
The fourth argument axis=0
specifies that the insertion should happen at position 0
for every column. We could've chosen rows but your X is a columns vector, so I figured we'd stay consistent.
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