[Numpy-discussion] Reordering indices

[Robert Kern]

On Fri, May 30, 2014 at 4:48 PM, Bob Dowling <rjd4+numpy at cam.ac.uk> wrote:
> Is there a clean way to create a view on an existing ND-array with its
> axes in a different order.
>
> For example, suppose I have an array of shape (100,200,300,3) and  I
> want to create a view of this where the vector coordinate is axis 0, not
> axis 3. (So the view will have shape (3,100,200,300).)
>
>
> Reading the help(numpy.ndarray) output I can't find anything better than
> repeated calls to swapaxes():
>
>  >>> B = A.swapaxes(0,3).swapaxes(1,3).swapaxes(2,3)
>
>
> Is there a "reorder_axes()" method that would let me write something
> like this:
>
>  >>> B = A.reorder_axes((3,0,1,2))
>
> Apologies in advance if I've missed the obvious method in the docs.

http://docs.scipy.org/doc/numpy/reference/generated/numpy.ndarray.transpose.html

-- 
Robert Kern