Re: [Pytables-users] Indexing Arrays: a la numarray

[travlr <vel...@gm...>]

Hi Fransesc, I hope you all had a very nice vaction :-)

On 9/7/05, Francesc Altet <fa...@ca...> wrote:
> Hi Travlr,
>=20
> A Wednesday 07 September 2005 09:32, travlr va escriure:
> > Today, I went back and got the "selecting and getting" Table <rows> and
> > Column <elements> for versions 1.0 and 1.1 working again, The attachmen=
ts
> > provided are a tables.Table.dif file for each version.
> > Below is an example of it's usage.
>=20
> Thanks for the patches. I think is a good idea to allow retrieving
> values using an index array. I'll apply the patches and hopefully they
> will appear in the forthcoming PyTables 1.2.

I hope you're also able to include setting values (and other
functionality mentioned) as well. I was able to implement "setting"
initially, but was not able to reproduce it with these patches.

>=20
> > Also Fransesc, two questions:
> > 1) Could the tables.Table.Column also have an .nrows (nelements) attrib=
ute?
>=20
> Well, you have access to the table object via the .table attribute. So
> you can use columnObject.table.nrows.
>=20
> > 2) Once bounded, tables.Table used to return as a <class
> > 'numarray.records.RecArray'> object. Now it returns a <class
> > 'tables.nestedrecords.NestedRecArray'> object....Is this necessary?.
>=20
> Strictly speaking no, but from PyTables 1.1 on, Table objects supports
> nested fields, so we have been forced to introduce such a
> NestedRecArray object. This is by not means a brand new object, but it
> is strongly based on RecArray (in fact, it inherits from RecArray).
> If, for whatever reason, you prefer a RecArray object, you have a
> couple of possibilities:
>=20
> 1.- Use asRecArray() method. See:
> http://pytables.sourceforge.net/html-doc/usersguide8.html#sectionB.2
> for more details.
>=20
> 2.- If your table has not nested fields, your NestedRecArray will be
> flat, and you can access the underlying RecArray object by just
> getting the object pointed by the ._flatArray attribute.

Actually, I really don't have a direct concern about this.

I wish my understandings (and free time) were greater, because I'd
like to offer what I can. In the near future my time will be more
free, and maybe I can at least do a little something with an
improvement of the documentation... I would have loved to have had an
hyperlinked index back when I was familiarizing myself with pyTables.
When I finish with my immediate responsibilities, I will offer again.

Thanks
Pete

> Cheers,
>=20
> --
> >0,0<   Francesc Altet http://www.carabos.com/
> V   V   C=E1rabos Coop. V. Enjoy Data
>  "-"
>=20
>