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.].我试过了:
I want to insert [6.] at the beginning. I've tried:
X = X.insert(X, 0)
如何插入到 X 中?
推荐答案
numpy 有一个 insert 函数,可以通过 np.insert 和 文档.
numpy has an insert function that's accesible via np.insert with documentation.
在这种情况下,您需要像这样使用它:
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 指定插入应该发生在每一列的0 位置.我们可以选择行,但您的 X 是列向量,所以我想我们会保持一致.
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.