Re: Re Re: [Pytables-users] Suggestions for storing mutlidimensionnal data in several pytables arrays

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

A Wednesday 07 September 2005 17:12, phi...@ho... va escriure:
> >Ok. I understand better now. With that, what you want is something
> >similar to:
> >
> >pressure.where(pressure.axis.longitude =3D=3D 0.2 and
> >               pressure.axis.latitude =3D=3D 0.45 )
> >
>
> That's exactly the idea behind all. And you go further with the
> suggestion about the direct mapping into indices. That could be very
> powerfull.

Yes. I'm thinking that this kind of approach could let the user do:

pressure.where(pressure.axis.longitude > 0.2 and
               pressure.axis.latitude < 0.45 )

or=20

pressure.where(0.1 <=3D pressure.axis.longitude <=3D 0.2 or
               pressure.axis.latitude < 0.45 )

or any other boolean combination. In addition, as HDF5 supports
natively boolean combinations of hyperslabs, this kind of operations
will potentially be very I/O efficient.

> Thanks a lot for taking in account new improvements.
> Of course, i can give you a hand if you need help.
> Tell me when you start programming it, we can work together.
> If you didn't have time, i will try soon to modify pytables code with
> your rigths.

Well, we are working in other things right now, but indeed I'd like to
have some spare time to implement this. Of course, you can always have
a deeper look into it and if you end with something I'll be more than
happy to include it in PyTables.

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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