提取一个numpy矩阵的前n列

我有一个像这样的数组:

  array([[-0.57098887, -0.4274751 , -0.38459931, -0.58593526],

[-0.22279713, -0.51723555, 0.82462029, 0.05319973],

[ 0.67492385, -0.69294472, -0.2531966 , 0.01403201],

[ 0.41086611, 0.26374238, 0.32859738, -0.80848795]])

现在,我要提取以下内容:

   [-0.57098887, -0.4274751]

[-0.22279713, -0.51723555]

[ 0.67492385, -0.69294472]

[ 0.41086611, 0.26374238]

所以基本上只是前两列。

回答:

如果a是数组:

In [11]: a[:,:2]

Out[11]:

array([[-0.57098887, -0.4274751 ],

[-0.22279713, -0.51723555],

[ 0.67492385, -0.69294472],

[ 0.41086611, 0.26374238]])

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