On Fri, Jul 5, 2013 at 8:40 AM, Francesc Alted <fal...@gmail.com> wrote:
> On 7/5/13 1:33 AM, Mathieu Dubois wrote:
> > tables.tableExtension.Table._createTable (tables/tableExtension.c:2181)
> >>
> >> tables.exceptions.HDF5ExtError: Problems creating the table
> >>
> >> I think that the size of the column is too large (if I remove the
> >> Image
> >> field, everything works perfectly).
> >>
> >>
> >> Hi Mathieu,
> >>
> >> This shouldn't be the case. What is the value of IMAGE_SIZE?
> >
> > IMAGE_SIZE is a tuple containing (121, 145, 121).
>
> This is a bit large for a row in the Table object. My recommendation
> for these cases is to use an associated EArray with shape (0, 121, 145,
> 121) and then append the images there. You can always refer to the
> image by issuing a __getitem__() operation on the EArray object with the
> index of the row in the table. Easy as a pie and you will allow the
> compression library (in case you are using compression) to work much
> more efficiently for the table.
>
Hi Francesc,
I disagree that this shape is too large for a table. Here is a minimal
example that works for me:
import tables as tb
import numpy as np
images = np.ones(100, dtype=[('id', np.uint16),
('image', np.float32, (121, 145, 121))
])
with tb.open_file('temp.h5', 'w') as f:
f.create_table('/', 'images', images)
I think that there is something else going on with the initialization but
Mathieu hasn't given us enough information to figure it out =/. A minimal
failing script would be super helpful here!
(BTW Mathieu, Tables can also take advantage of compression. Though
Francesc's solution is nicer for a lot of reason too.)
Be Well
Anthony
>
> HTH,
>
> -- Francesc Alted
>
>
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