H5Part development and discussion

[Achim Gsell <achim AT cybercity.ch>]

On Friday 26 January 2007 20:49, Kurt Stockinger wrote:

> I have a specific question about the data format. Is currently
> the assumption that each scalar field is a group (see
> TestField1 and TestField2) and the name of the dataset in the
> scalar field is always "0"?

Yes, if you write a scalar field, a new group in the 
group "Block" will be created and in this new group a dataset 
with the name "0". If you write a 3d-vector field, it's exactly 
the same, but the datasets are named "0", "1" and "2"  
corresponding to the three dimensions.  This scheme can easily 
be extended to any dimension.

I wouldn't say that this is an "assumption", this is the 
*defined* format.

> Find below a simple example based 
> on H5BlockParTestScalarField.c where I create 2 scalar fields
> with
>
> ...
> H5Block3dWriteScalarField ( f, "TestField1", data );
> ...
> H5Block3dWriteScalarField ( f, "TestField2", data2 );
>
>
> src/H5PartTest> h5dump -H blockfile2.h5
> HDF5 "blockfile2.h5" {
> GROUP "/" {
>    GROUP "Step#0" {
>       GROUP "Block" {
>          GROUP "TestField1" {
>             DATASET "0" {
>                DATATYPE  H5T_IEEE_F64LE
>                DATASPACE  SIMPLE { ( 4, 3, 2 ) / ( 4, 3, 2 ) }
>             }
>          }
>          GROUP "TestField2" {
>             DATASET "0" {
>                DATATYPE  H5T_IEEE_F64LE
>                DATASPACE  SIMPLE { ( 4, 3, 2 ) / ( 4, 3, 2 ) }
>             }
>          }
>       }
>    }
> }
> }

If I have the time tomorrow, I will write a short specification 
of the current H5Part file format.  Otherwise you have to wait 
until I'm back from vacation.

Achim