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Re: error saving empty matrix in HDF5 format
From: |
John W. Eaton |
Subject: |
Re: error saving empty matrix in HDF5 format |
Date: |
Fri, 5 Mar 2004 11:33:26 -0600 |
On 3-Mar-2004, David Bateman <address@hidden> wrote:
| Ok, looking at this again it seems that the discussion I pointed out
| was about the possibility of including empty objects in the HDF files.
| At the moment this is not even implemented.
|
| So, not sure what the best thing to do here is, as there are no empty array
| structures in HDF files... At the moment the structure is
|
| <variable name> <GROUP> -- > type "octave_value" <DATASET>
| > value <DATASET>
| > OCTAVE_EMPTY_MATRIX <ATTRIBUTE>
|
| where "OCTAVE_EMPTY_MATRIX" is a flag and "value" contains either the
| data of a non empty matrix or the dimensions of the matrix if
| "OCATVE_EMPTY_MATRIX" is set. What we would like is
|
| <variable name> <GROUP> -- > type "octave_value" <DATASET>
| > value "empty dataset" <DATASET>
| > OCTAVE_EMPTY_MATRIX <ATTRIBUTE>
|
| where OCTAVE_EMPTY_MATRIX is now an attribute containing the array dimensions.
| However, this is not possible even with the latest versions of HDF5. Are
| there any other choices that make sense?
I don't know what the best solution is.
Unfortunately, since HDF does not handle zero-length dimensions
directly, that means that we have to insert kluges for every N-d
type. For example, it seems that with the latest CVS I can save and
reload an empty N-d numeric array, but not an empty N-d cell array.
Perhaps we need to get the attention of the HDF people and get them to
handle zero-length dimensions?
jwe
- Re: error saving empty matrix in HDF5 format, David Bateman, 2004/03/01
- Re: error saving empty matrix in HDF5 format, David Bateman, 2004/03/01
- Re: error saving empty matrix in HDF5 format, David Bateman, 2004/03/01
- Re: error saving empty matrix in HDF5 format, John W. Eaton, 2004/03/01
- Re: error saving empty matrix in HDF5 format, David Bateman, 2004/03/02
- Re: error saving empty matrix in HDF5 format, Paul Kienzle, 2004/03/02
- Re: error saving empty matrix in HDF5 format, David Bateman, 2004/03/03
- Re: error saving empty matrix in HDF5 format,
John W. Eaton <=
- Re: error saving empty matrix in HDF5 format, David Bateman, 2004/03/07
- Re: error saving empty matrix in HDF5 format, Paul Kienzle, 2004/03/07
- Re: error saving empty matrix in HDF5 format, John W. Eaton, 2004/03/12