numpy-discussion

[Numpy-discussion] sort(axis=-1)

[Christian K. <ck...@ho...>]

Hi,

it seems that -1 as axis parameter is interpreted like in array indexing, i.e.
-1 means the last axis rather than meaning the only axis of the flattened
representation, like for example with take().
Is that intendend?

Christian

Re: [Numpy-discussion] sort(axis=-1)

[Robert K. <rob...@gm...>]

Christian Kristukat wrote:
> Hi,
> 
> it seems that -1 as axis parameter is interpreted like in array indexing, i.e.
> -1 means the last axis rather than meaning the only axis of the flattened
> representation, like for example with take().
> Is that intendend?

take(axis=-1) also goes over the last axis. axis=None operates over the 
flattened array. axis=None is the default for take(), but axis=-1 is default for 
sort() since axis=None doesn't make much sense for an inplace operation and is 
not permitted.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco

Re: [Numpy-discussion] sort(axis=-1)

[Travis O. <oli...@ie...>]

Christian Kristukat wrote:
> Hi,
>
> it seems that -1 as axis parameter is interpreted like in array indexing, i.e.
> -1 means the last axis rather than meaning the only axis of the flattened
> representation, like for example with take().
> Is that intendend?
>
>   

I don't understand the question.   Yes, sort(axis=-1) sorts along the 
last dimension.

AFAIK, take has the same meaning for axis.

-Travis

Re: [Numpy-discussion] sort(axis=-1)

[Christian K. <ck...@ho...>]

Travis Oliphant <oliphant.travis <at> ieee.org> writes:

> 
> Christian Kristukat wrote:
> > Hi,
> >
> > it seems that -1 as axis parameter is interpreted like in array indexing, 
> > -1 means the last axis rather than meaning the only axis of the flattened
> > representation, like for example with take().
> > Is that intendend?
> >
> >   
> 
> I don't understand the question.   Yes, sort(axis=-1) sorts along the 
> last dimension.
> 
> AFAIK, take has the same meaning for axis.

Oh sure, I mixed that up with axis=None as Robert pointed out. However I don't
understand why axis=None wouldn't make sense for an inplace operation. Anyway,
it's not important. Sorry for the noise.

Christian