[Numpy-discussion] Added atleast_nd, request for clarification/cleanup of atleast_3d

[Sebastian Berg]

On Mi, 2016-07-06 at 15:30 -0400, Benjamin Root wrote:
> I don't see how one could define a spec that would take an arbitrary
> array of indices at which to place new dimensions. By definition, you
> 

You just give a reordered range, so that (1, 0, 2) would be the current
3D version. If 1D, fill in `1` and `2`, if 2D, fill in only `2` (0D,
add everything of course).
However, I have my doubts that it is actually easier to understand then
to write yourself ;).

- Sebastian
 

> don't know how many dimensions are going to be added. If you knew,
> then you wouldn't be calling this function. I can only imagine simple
> rules such as 'left' or 'right' or maybe something akin to what
> at_least3d() implements.
> 
> On Wed, Jul 6, 2016 at 3:20 PM, Joseph Fox-Rabinovitz <jfoxrabinovitz
> @gmail.com> wrote:
> > On Wed, Jul 6, 2016 at 2:57 PM, Eric Firing <efiring at hawaii.edu>
> > wrote:
> > > On 2016/07/06 8:25 AM, Benjamin Root wrote:
> > >>
> > >> I wouldn't have the keyword be "where", as that collides with
> > the notion
> > >> of "where" elsewhere in numpy.
> > >
> > >
> > > Agreed.  Maybe "side"?
> > 
> > I have tentatively changed it to "pos". The reason that I don't
> > like
> > "side" is that it implies only a subset of the possible ways that
> > that
> > the position of the new dimensions can be specified. The current
> > implementation only puts things on one side or the other, but I
> > have
> > considered also allowing an array of indices at which to place new
> > dimensions, and/or a dictionary keyed by the starting ndims. I do
> > not
> > think "side" would be appropriate for these extended cases, even if
> > they are very unlikely to ever materialize.
> > 
> >     -Joe
> > 
> > > (I find atleast_1d and atleast_2d to be very helpful for handling
> > inputs, as
> > > Ben noted; I'm skeptical as to the value of atleast_3d and
> > atleast_nd.)
> > >
> > > Eric
> > >
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