Re: [Pytables-users] Re: Dimension Scales and Pytables

[Francesc A. <fa...@ca...>]

A Divendres 09 Desembre 2005 10:52, rem...@gm... va escriure:
> But there's something I've done that I feel uncomfortable with (hence this
> mail). Indeed I'm beginning to wonder whether adding new attributes (the
> ones storing pathnames instead of 'references') was so good an idea.
> Thanks to these attributes, I could almost get rid of the functions from
> the HDF5 Api for Dimension Scales. But my goal was not to redo Dimension
> Scales for PyTables, but rather to integrate the feature from Hdf5. Besid=
es
> redoing a Hdf5 feature would - to my mind - be contrary to the PyTables=20
> philosophy. If I could get the pathname of a dataset from its 'reference',
> I wouldn't have to add these attributes. And my work could be greately
> simplified. I've asked one of the Hdf5 team about this point, but accordi=
ng
> to him it's currently not possible.
> But maybe Hdf5 could be slightly modified, or maybe you know an other way
> to work around my problem (given that you certainly know much more about
> Hdf5 than I do).

Well, I am not very used to references in HDF5 (in fact, this is my
first contact with them), but it is indeed unfortunate that you cannot
derive the pathname of a dataset by dereferencing a HDF5 reference. I
would suggest you to continue maintaining the REF_LIST and DIM_LIST
attributes in order to keep track of the different dimension scales
associations. Of course, this represents a deviation from the
'standard', but as it is an addition and not a modification, I think
it is not grave at all (in fact, PyTables has many other additional
attributes than the 'standard' in HDF5_HL objects).

If in the future we can figure out how to derive pathnames from
dereferences, then we can consider getting rid of the REF_LIST and
DIM_LIST attributes. Meanwhile, I do hope that it won't be too
difficult maintaining those attributes in your implementation of
dimension scales.

Cheers,


=2D-=20
>0,0<   Francesc Altet =A0 =A0 http://www.carabos.com/
V   V   C=E1rabos Coop. V. =A0=A0Enjoy Data
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