On Sep 8, 2010, at 9:45 AM, Francesc Alted wrote:
> A Wednesday 08 September 2010 09:29:53 Quincey Koziol escrigué:
>> Hi Joseph,
>>
>> On Sep 7, 2010, at 8:09 PM, J Glassy wrote:
>>> Hello,
>>>
>>> I'm using v1.8.4-patched on Linux x86_64, and would like to know if
>>> it is possible to change a fillvalue [ H5Pset_fill_value() ] for a
>>> dataset, once it has already been "burned in" at creation time?
>>
>> No, dataset/group/file creation properties are permanent once the object
>> exists.
>>
>>> Below I show code for trying to change an existing fillvalue using
>>> HDF5 ANSI C API, and realize I'm missing something critical about how
>>> H5Dget_create_plist( {YourDataset_ID} ) works.
>>
>> The H5<X>get_create_plist call(s) return a _copy_ of the creation
>> property
>> list for an object. Changing the properties in that list has no effect on
>> the object.
>>
>> If you email Francesc Alted (the PyTables author), he might patch in
>> support for setting the fill value of a dataset.
>
> Err, I think you meant Andrew Collette (the author of h5py ;-). BTW,
> PyTables
> already has support for setting these fill values in creation time.
Whoops! Sorry, I have to read through the email I'm replying to
closer! :-)
Quincey
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