Re: [Pytables-users] Suggestions for storing =?iso-8859-1?q?mutlidimensionnal=09data_in_several_pytables?= arrays

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

A Tuesday 06 September 2005 16:08, phi...@ho... va escriure:
> Sorry that doesn't seem clear.
> No limitations of pytables.
> It's much more that i'm not allowed to use table.
> Arrays are more appreciated to achieve my goal .

Ok. But it's a pity because using the filtering capabilities in Table
objects, like:

[r['pressure'] for r in table if r['latitude'] =3D=3D X and r['latitude'] =
=3D=3D Y]

is very powerful to do what you are willing to.

> That could be a good starting point. I only need an ordered list
> containing path of each array of system parameters.
> For example, the attribute could be
> ['/parameters/longitude','/parameters/latitude','/parameters/time']

Definitely, that could be a solution if you want to stick with arrays.

> In fact, i'm joining Norbert Nemec in his post from 2005-01-24 11:51 to
> request a convention in pytables to store not only data but also a way
> to link the data.
>
> Here is thye situation, better represented:
[snipped]

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 )

isn't it?

Well, I must recognize that the idea is pretty nice. In addition, if
values in latitude and longitude have a direct mapping into indices
(as you seem to suggest), then a binary search on axis could be made
so that finding the indexes should be a very fast operation.

Well, I think I'll put this suggestion in our TODO file.

Thanks for your detailed explanation!

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