On Mar 15, 2012, at 1:30 PM, Alvaro Tejero Cantero wrote:
> I had seen this, but I don't see how to point to regions inside a
> leaf. It seems that h5py supports this. Quoting from their
> documentation
>
> <>
> Region references always contain a selection. You create them using
> the dataset property “regionref” and standard NumPy slicing syntax:
>
>>>> myds = myfile.create_dataset('dset', (200,200))
>>>> regref = myds.regionref[0:10, 0:5]
>
> The reference itself can now be used in place of slicing arguments to
> the dataset:
>
>>>> subset = myds[regref]
> </>
>
> It seems that they can be stored in datasets and attributes.
>
> Typically I would like to store references to interesting features in
> my data (contiguous slices) that I have detected with some algorithm,
> and I was wondering if I could do that with refs in HDF5 with PyTables
> or I should just use tuples of integers to store slices (start, end)
> in another table, and establish a link to the table /column that these
> tuples refer to.
No, native HDF5 region references are not supported by PyTables (although it
would be nice if we could have this implemented). In case you want this, then
storing (start, end) in other table/column/nested column, would solve the
problem.
-- Francesc Alted
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