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HDF5 Tutorial: Learning The Basics
Creating Datasets in Groups

Creating Datasets in Groups

We have shown how to create groups, datasets, and attributes. In this section, we show how to create datasets in groups. Recall that H5Dcreate/h5dcreate_f creates a dataset at the location specified by a location identifier and a name. Similar to H5Gcreate/h5gcreate_f, the location identifier can be a file identifier or a group identifier and the name can be relative or absolute. The location identifier and the name together determine the location where the dataset is to be created. If the location identifier and name refer to a group, then the dataset is created in that group.

Programming Example

Description

This example shows how to create a dataset in a particular group. It opens the file created in the previous example and creates two datasets.

h5_crtgrpd.c

h5_crtgrpd.f90

h5tutr_crtgrpd.cpp

h5_crtgrpd.py

See HDF5 Introductory Examples for the examples used in the Learning the Basics tutorial. There are examples for several other languages, including Java.

For details on compiling an HDF5 application: [ Compile Information ]

File Contents

Fig. 10.1 The Contents of groups.h5 (groupsf.h5 for FORTRAN)

Fig. 10.2a groups.h5 in DDL


HDF5 "groups.h5" {
GROUP "/" {
GROUP "MyGroup" {
GROUP "Group_A" {
 DATASET "dset2" {
    DATATYPE { H5T_STD_I32BE }
    DATASPACE { SIMPLE ( 2, 10 ) / ( 2, 10 ) }
    DATA {
       1, 2, 3, 4, 5, 6, 7, 8, 9, 10,
       1, 2, 3, 4, 5, 6, 7, 8, 9, 10
    }
 }
}
GROUP "Group_B" {
}
DATASET "dset1" {
 DATATYPE { H5T_STD_I32BE }
 DATASPACE { SIMPLE ( 3, 3 ) / ( 3, 3 ) }
 DATA {
    1, 2, 3,
    1, 2, 3,
    1, 2, 3
 }
}
}
}
}

Fig. 10.2b groupsf.h5 in DDL


HDF5 "groupsf.h5" {
GROUP "/" {
GROUP "MyGroup" {
GROUP "Group_A" {
 DATASET "dset2" {
    DATATYPE { H5T_STD_I32BE }
    DATASPACE { SIMPLE ( 10, 2 ) / ( 10, 2 ) }
    DATA {
       1, 1,
       2, 2,
       3, 3,
       4, 4,
       5, 5,
       6, 6,
       7, 7,
       8, 8,
       9, 9,
       10, 10
    }
 }
}
GROUP "Group_B" {
}
DATASET "dset1" {
 DATATYPE { H5T_STD_I32BE }
 DATASPACE { SIMPLE ( 3, 3 ) / ( 3, 3 ) }
 DATA {
    1, 1, 1,
    2, 2, 2,
    3, 3, 3
 }
}
}
}
}

- - Last modified: 25 August 2016

HDF5 Tutorial: Learning The BasicsCreating Datasets in Groups

Contents:

Creating Datasets in Groups

Programming Example

Description

File Contents

HDF5 Tutorial: Learning The Basics
Creating Datasets in Groups