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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