Stack 1-D arrays as columns into a 2-D array.

Take a sequence of 1-D arrays and stack them as columns to make a single 2-D array. 2-D arrays are stacked as-is, just like with hstack. 1-D arrays are turned into 2-D columns first.


tup (sequence of 1-D or 2-D arrays.) – Arrays to stack. All of them must have the same first dimension.


stacked – The array formed by stacking the given arrays.

Return type

2-D array


>>> a = np.array((1,2,3))
>>> b = np.array((2,3,4))
>>> np.column_stack((a,b))
array([[1., 2.],
       [2., 3.],
       [3., 4.]])