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Appending data to a dataset in an HDF5 file [message #52356]

Wed, 31 January 2007 08:40

Maarten[1]
Messages: 176
Registered: November 2005

Senior Member

Hi,

The title says it all, really: I'm trying to create a dataset with an
unlimited dimension, so that I can append data later, preferably
without reading the previous data. Right now I'm not even getting to
that last refinement, just reading the data, then extending the array
and finally writing the extended array back to the file fails.

I create the dataspace with

dataspace_id = H5S_CREATE_SIMPLE([10,20,13], max_dim=[-1,20,13])

and I think this creates an unlimited first dimension (if I understand
the docs, which may be a tad optimistic). I can write a single data
set, but when writing the second (appended) set I'd expect that
writing something with dimensions [12,20,13] would be possible, but I
get an error:

% H5D_WRITE: Number of elements in the IDL variable must match that of
the HDF5 dataspace/datatype

What am I doing wrong here? Do I need to set the dimension itself to
[-1,20,13]? The docs don't seem to suggest that.

Help!

Maarten

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[Message index]

		Appending data to a dataset in an HDF5 file By: Maarten[1] on Wed, 31 January 2007 08:40
		Re: Appending data to a dataset in an HDF5 file By: eddie haskell on Fri, 02 February 2007 07:54
		Re: Appending data to a dataset in an HDF5 file By: Maarten[1] on Mon, 05 February 2007 02:35
		Re: Appending data to a dataset in an HDF5 file By: Maarten[1] on Fri, 02 February 2007 00:50
		Re: Appending data to a dataset in an HDF5 file By: eddie haskell on Thu, 01 February 2007 08:51
		Re: Appending data to a dataset in an HDF5 file By: David Fanning on Mon, 05 February 2007 05:22

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