[Numpy-discussion] flip array on axis

[Warren Weckesser]

On Wed, Jul 10, 2013 at 12:03 PM, Andreas Hilboll <lists at hilboll.de> wrote:

> On 10.07.2013 17:06, Matthew Brett wrote:
> > Hi,
> >
> > On Wed, Jul 10, 2013 at 11:02 AM, Andreas Hilboll <lists at hilboll.de>
> wrote:
> >> Hi,
> >>
> >> there are np.flipud and np.fliplr methods to flip 2d arrays on the first
> >> and second dimension, respectively. What can I do to flip an array on an
> >> axis which I don't know before runtime? I'd really like to see a
> >> np.flip(arr, axis) method which lets me specify which axis to flip on.
> >
> > I have something like that that's a few lines long:
> >
> > https://github.com/nipy/nibabel/blob/master/nibabel/orientations.py#L231
> >
> > Cheers,
> >
> > Matthew
> > _______________________________________________
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> >
>
> Thanks, Matthew! Should this go into numpy itself? If so, I could
> prepare a PR, if you point me to the right place (file) to put it.
>
>

Something like this would be nice to have in numpy, so we don't continue to
reinvent it (e.g.
https://github.com/scipy/scipy/blob/master/scipy/signal/_arraytools.py; see
`axis_slice` and `axis_reverse`).

Warren



> Cheers, Andreas.
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