[Numpy-discussion] Proposal for a new function: np.moveaxis

Juan Nunez-Iglesias jni.soma at gmail.com
Thu Nov 5 03:26:24 EST 2015


I'm just a lowly user, but I'm a fan of this. +1!

On Thu, Nov 5, 2015 at 6:42 PM, Stephan Hoyer <shoyer at gmail.com> wrote:

> I've put up a pull request implementing a new function, np.moveaxis, as an
> alternative to np.transpose and np.rollaxis:
> https://github.com/numpy/numpy/pull/6630
> This functionality has been discussed (even the exact function name)
> several times over the years, but it never made it into a pull request. The
> most pressing issue is that the behavior of np.rollaxis is not intuitive to
> most users:
> https://mail.scipy.org/pipermail/numpy-discussion/2010-September/052882.html
> https://github.com/numpy/numpy/issues/2039
> http://stackoverflow.com/questions/29891583/reason-why-numpy-rollaxis-is-so-confusing
> In this pull request, I also allow the source and destination axes to be
> sequences as well as scalars. This does not add much complexity to the
> code, solves some additional use cases and makes np.moveaxis a proper
> generalization of the other axes manipulation routines (see the pull
> requests for details).
> Best of all, it already works on ndarray duck types (like masked array and
> dask.array), because they have already implemented transpose.
> I think np.moveaxis would be a useful addition to NumPy -- I've found
> myself writing helper functions with a subset of its functionality several
> times over the past few years. What do you think?
> Cheers,
> Stephan
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