Re: [Pytables-users] Any way to link tables?

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

Hi Chuck,

A Dijous 06 Maig 2004 18:53, chuck clark va escriure:
> Now, it is the end of the month and I'd like to do a summary for the
> month.  I've been able to generate that monthly summary for all statistics
> except one from the daily summaries.  However, for this last stat I need
> to look at all datapoints.  Is there a way that I can "link" tables so
> that when I traverse all the rows in _20040301 my row iterator
> automatically continues on to _20040302?
> 
> I can do it with a for loop or even write a facade that makes a list of
> tables look like one table but I wanted to make sure this wasn't a bit of
> functionality that already exists which I am missing.

I understand what you want to do, but this is not currently implemented in
PyTables, so you will need to write the code for yourself (it shouldn't be
complicated, I guess). I am pondering to add soon reference support in
pytables, and eventually support this kind of table-chain iterator. No
promises, though.

> Do I read this incorrectly, even if you had the time you couldn't truly
> implement it on top of HDF5 since HDF5 doesn't support it yet.

No, you read well, but I think this documentation is outdated (HDF5 1.4). Go
to this one: http://hdf.ncsa.uiuc.edu/HDF5/doc/UG/index.html and follow the
"Datatypes" hyperlink. This documentation is updated to HDF5 1.6.2 and seems
like if time and data support *is* there.

Cheers,

-- 
Francesc Alted