Created at https://github.com/PyTables/PyTables/issues/123. If I get a
chance, I'll see if I can work out how to add this functionality but it
won't be for a few weeks.
Thanks!
Brad
On Thu, Jan 19, 2012 at 2:10 PM, Anthony Scopatz <scop...@gmail.com> wrote:
> On Thu, Jan 19, 2012 at 1:02 PM, Antonio Valentino <
> antonio.valent...@tiscali.it> wrote:
>
>> Hi Brad,
>>
>> Il 19/01/2012 04:13, Brad Buran ha scritto:
>> > Hi Antonio:
>> >
>> > The user block I am referring to is a region at the beginning of the
>> > file that is reserved for user metadata. I pasted the description
>> > from the HDF5 documentation below
>> > (http://www.hdfgroup.org/HDF5/doc1.6/UG/08_TheFile.html). I believe
>> > H5Py added this feature
>> > (http://code.google.com/p/h5py/source/detail?r=8a3010d07e14); however,
>> > I don't see a similar way to do this via PyTables. I suppose I could
>> > use h5py to create a blank HDF5 file with the required user block then
>> > reopen it in PyTables, however, I'd like to minimize code dependencies
>> > and everything I've written is built around PyTables rather than h5py.
>> >
>>
>> Sorry, for the misunderstanding, I was not aware of this feature.
>>
>> Please file a feature request on https://github.com/PyTables/PyTables
>>
>
> Yes, I agree that this should be an added feature. It seems like it
> should be a
> keyword argument to the File() constructor.
>
> As Antonio said, please open an issue for this. On the other hand if you
> want to
> try your hand implementing it, we'll review any pull request you send our
> way.
>
> Be Well
> Anthony
>
>
>>
>>
>> best regards
>>
>>
>> > Thanks!
>> > Brad
>> >
>> > Documentation from HDF5:
>> >
>> > User-block size
>> > herr_t H5Pset_userblock (hid_t plist, hsize_t size)
>> > herr_t H5Pget_userblock (hid_t plist, hsize_t *size)
>> >
>> > The user-block is a fixed-length block of data located at the
>> > beginning of the file and which is ignored by the HDF5 library. This
>> > block is specifically set aside for any data or information that
>> > developers determine to be useful to their application but that will
>> > not be used by the HDF5 library. The size of the user-block is defined
>> > in bytes and may be set to any power of two, with a minimum size of
>> > 512 bytes (i.e. 512, 1024, 2048, etc). This property is set with
>> > H5Pset_userblock and queried via H5Pget_userblock.
>> >
>> > For example, if an application was thought to reqire a 4K
>> > user-block, that could be set with the following function call:
>> > status = H5Pset_userblock(fcpl_id, 4096)
>> > The property list could later be queried with
>> > status = H5Pget_userblock(fcpl_id, size)
>> > and the value 4096 would be returned in the parameter size.
>> >
>> >
>> > On Wed, Jan 18, 2012 at 4:52 PM, Antonio Valentino
>> > <antonio.valent...@tiscali.it> wrote:
>> >> Hi Brad,
>> >>
>> >> Il 18/01/2012 21:49, Brad Buran ha scritto:
>> >>> Is there a way to set the size of the user block when creating a file
>> >>> in PyTables? This would be useful for using PyTables to generate
>> >>> Matlab 7.3 compatible files.
>> >>>
>> >>> Brad
>> >>
>> >> Try to use CArrays and set the chunkshape explicitly
>> >>
>> >>
>> http://pytables.github.com/usersguide/libref.html#tables.File.createCArray
>> >>
>> >> Does it answers your question?
>> >>
>> >>
>> >> best regards
>> >>
>> >>
>> >> --
>> >> Antonio Valentino
>> >>
>>
>> --
>> Antonio Valentino
>>
>>
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