grab first 2 collumns from np array code example

Example 1: extract column numpy array python

# Extract/ Slice only the 3rd column from the numpy array
print(a2[:,[2]])

Example 2: how to get the first few lines of an ndarray

In [11]: a[:,:2]
Out[11]: 
array([[-0.57098887, -0.4274751 ],
       [-0.22279713, -0.51723555],
       [ 0.67492385, -0.69294472],
       [ 0.41086611,  0.26374238]])