提取一个numpy矩阵的前n列

如何解决提取一个numpy矩阵的前n列

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]])

解决方法

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。