Re: [Pytables-users] writing metadata

[Andre' Walker-L. <wal...@gm...>]

Hi Andreas, Josh, Anthony and Antonio,

Thanks for your help.


Andre





On Jun 26, 2013, at 2:48 AM, Antonio Valentino wrote:

> Hi Andre',
> 
> Il 25/06/2013 10:26, Andre' Walker-Loud ha scritto:
>> Dear PyTables users,
>> 
>> I am trying to figure out the best way to write some metadata into some files I have.
>> 
>> The hdf5 file looks like
>> 
>> /root/data_1/stat
>> /root/data_1/sys
>> 
>> where "stat" and "sys" are Arrays containing statistical and systematic fluctuations of numerical fits to some data I have.  What I would like to do is add another object
>> 
>> /root/data_1/fit
>> 
>> where "fit" is just a metadata key that describes all the choices I made in performing the fit, such as seed for the random number generator, and many choices for fitting options, like initial guess values of parameters, fitting range, etc.
>> 
>> I began to follow the example in the PyTables manual, in Section 1.2 "The Object Tree", where first a class is defined 
>> 
>> class Particle(tables.IsDescription):
>> 	identity = tables.StringCol(itemsize=22, dflt=" ", pos=0)
>> 	...
>> 
>> and then this class is used to populate a table.
>> 
>> In my case, I won't have a table, but really just want a single object containing my metadata.  I am wondering if there is a recommended way to do this?  The "Table" does not seem optimal, but I don't see what else I would use.
>> 
>> 
>> Thanks,
>> 
>> Andre
>> 
> 
> For leaf nodes (Tables, Array, ets) you can use the "attrs" attribute
> set [1] as described in [2].
> For group objects (like e.g. "root") you can use the "set_node_attr"
> method [3] of File objects or "_v_attrs".
> 
> 
> cheers
> 
> [1]
> http://pytables.github.io/usersguide/libref/declarative_classes.html#attributesetclassdescr
> [2]
> http://pytables.github.io/usersguide/tutorials.html#setting-and-getting-user-attributes
> [3]
> http://pytables.github.io/usersguide/libref/file_class.html#tables.File.set_node_attr
> 
> 
> -- 
> Antonio Valentino
> 
> ------------------------------------------------------------------------------
> This SF.net email is sponsored by Windows:
> 
> Build for Windows Store.
> 
> http://p.sf.net/sfu/windows-dev2dev
> _______________________________________________
> Pytables-users mailing list
> Pyt...@li...
> https://lists.sourceforge.net/lists/listinfo/pytables-users