Python: Is there an inverse for ndarray.flatten('F')?

Question

For example:

from numpy import * x = array([[1,2], [3, 4], [5, 6]]) print x.flatten('F') >>>[1 3 5 2 4 6] 

Is it possible to get [[1,2], [3, 4], [5, 6]] from [1 3 5 2 4 6]?

Answer 1

>>> a = numpy.array((1, 3, 5, 2 ,4, 6)) >>> a.reshape(2, -1).T array([[1, 2],        [3, 4],        [5, 6]]) >>>  

Answer 2

This seems a little more straightforward. Just pass the original shape back into reshape.

import numpy as np np.array([[1,2], [3, 4], [5, 6]]).flatten().reshape((3, 2)) 

---

array([[1, 2],        [3, 4],        [5, 6]]) 

And for your Fortran ordering, pass 'F' for the reshape order:

import numpy as np np.array([[1,2], [3, 4], [5, 6]]).flatten('F').reshape((3, 2), order='F') 

---

array([[1, 2],        [3, 4],        [5, 6]])