[Numpy-discussion] indexing of rank-0 structured arrays: why not?

[Robert Kern]

On Mon, Jan 10, 2011 at 10:08, Nils Becker <n.becker at amolf.nl> wrote:
> Hi,
>
> I noticed that I can index into a dtype when I take an element
> of a rank-1 array but not if I make a rank-0 array directly. This seems
> inconsistent. A bug?

Not a bug. Since there is no axis, you cannot use integers to index
into a rank-0 array. Use an empty tuple instead.

[~]
|1> dt = np.dtype([('x', '<f8'), ('y', '<f8')])

[~]
|2> a_rank_0 = np.zeros((), dtype=dt)

[~]
|3> a_rank_0[()]
(0.0, 0.0)

-- 
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