Anthony,
I read of the documentation and tried creating a table with a VLArray nested
inside, but can't seem to figure out how to nest anything inside a table
other than another table description.
I found this question that is trying to do exactly what I want to do:
http://stackoverflow.com/questions/5366099/in-pytables-how-to-create-nested-array-of-variable-length
It is well written but has no answers.
Any specific ideas on how to make this example work?
Jason
On Wed, Jun 22, 2011 at 2:57 PM, Anthony Scopatz <scop...@gmail.com> wrote:
> Also note that whenever you are dealing with variable length stuctures,
> chuncksize is very important.
>
>
> On Wed, Jun 22, 2011 at 4:55 PM, Anthony Scopatz <scop...@gmail.com>wrote:
>
>> Hi Jason,
>>
>> You can try nesting variable length arrays inside of your table (
>> http://www.pytables.org/docs/manual/ch04.html#VLArrayClassDescr). You
>> might need to refer to nested tables to get an idea of how to do this (
>> http://www.pytables.org/docs/manual/ch03.html#id332794). On the HDF5
>> level, tables are just a convenient wrapper around variable length arrays of
>> structs. Since you can nest tables, you should be able to nest VLArrays
>> inside of tables.
>>
>> Let us know if you run into specific problems.
>>
>> Be Well
>> Anthony
>>
>> On Wed, Jun 22, 2011 at 4:46 PM, Jason Moore <moorepa...@gmail.com>wrote:
>>
>>> Hi,
>>>
>>> I've been attempting to use pyTables to store data from a
>>> data acquisition system that I'm using for my experimental work. I currently
>>> make use of several pytables tables to store the data and really like the
>>> querying ability that the table object provides. But I have an issue with
>>> storing arrays in a table column. For each experiment that I do, I record
>>> data for a different amount of time and potentially a different sampling
>>> rate. I'd like the rows of the table to correspond with each experiment and
>>> the columns with the various data signals that I collect. But it seems that
>>> a pytables table object requires every array in a column to be of the same
>>> shape. Right now I choose an arbitrarily large shape in my table definition
>>> and I'm awkwardly padding the data signals before I store them in the table.
>>> Are there other ways to do this?
>>>
>>> Jason
>>>
>>> --
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>>
>
>
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--
http://mae.ucdavis.edu/~biosport/jkm/
Sports Biomechanics Lab <http://biosport.ucdavis.edu>, UC Davis
Davis Bike Collective <http://www.davisbikecollective.org> Minister, Davis,
CA
BikeDavis.info
Office: +01 530-752-2163
Lab: +01 530-752-2235
Home: +01 530-753-0794
------------------------------------------------------------------------------
Simplify data backup and recovery for your virtual environment with vRanger.
Installation's a snap, and flexible recovery options mean your data is safe,
secure and there when you need it. Data protection magic?
Nope - It's vRanger. Get your free trial download today.
http://p.sf.net/sfu/quest-sfdev2dev
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