yeah, indexing with a list (rather than a tuple) has a different meaning.
The most notable place I have seen list-indexing used is with numpy
structured arrays. In all other locations the tuple slicing is
for drilling down different dimensions, as you say.
On Wed, Jan 23, 2013 at 10:25 AM, Andreas Hilboll <li...@hilboll.de> wrote:
> Am Mi 23 Jan 2013 16:57:27 CET schrieb Anthony Scopatz:
> > Hi Andreas,
> >
> > I think that the problem here is that coord_slice is actually a list
> > of slices, which you can't index by. (Though, you may be able to in
> > numpy...)
> >
> > Try something like _ds[coord_slice[0]] instead.
> >
> > Be Well
> > Anthony
> >
> > B eW
> >
> >
> >
> > On Tue, Jan 22, 2013 at 8:44 AM, Andreas Hilboll <li...@hilboll.de
> > <mailto:li...@hilboll.de>> wrote:
> >
> > Hi,
> >
> > how can I use Python's built-in `slice` object on CArray?
> > Currently, I'm
> > trying
> >
> > In: coord_slice
> > Out: [slice(0, 31, None), slice(0, 5760, None), slice(0, 2880,
> > None)]
> >
> > In: _ds
> > Out: /data/mydata (CArray(31, 5760, 2880), shuffle, blosc(5)) ''
> > atom := Float32Atom(shape=(), dflt=0.0)
> > maindim := 0
> > flavor := 'numpy'
> > byteorder := 'little'
> > chunkshape := (1, 45, 2880)
> >
> > In: _ds[coord_slice]
> > Out: *** TypeError: long() argument must be a string or a number,
> > not 'slice'
> >
> > The problem is that I want to write something generic, and I don't
> > know
> > beforehand how many dimensions the CArray has. My current plan is to
> > create a tuple of slice objects programatically (using list
> > comprehension), and then use this tuple as index. But apparently it
> > doesn't work with pytables 2.3.1.
> >
> > Any suggestions on how to accomplish my task are greatly
> > appreciated :)
> >
> > Cheers, Andreas.
> >
> >
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> Hi Anthony,
>
> thanks for your input. However, I need to slice in multiple dimensions
> simultaneously, because my array is very large and I don't want to clog
> memory.
>
> However, I found out that it works with a tuple of slice objects, so
> _ds[tuple(coord_slice)] works as expected.
>
> Cheers, Andreas.
>
>
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