! * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
!   Copyright by The HDF Group.                                               *
!   Copyright by the Board of Trustees of the University of Illinois.         *
!   All rights reserved.                                                      *
!                                                                             *
!   This file is part of HDF5.  The full HDF5 copyright notice, including     *
!   terms governing use, modification, and redistribution, is contained in    *
!   the COPYING file, which can be found at the root of the source code       *
!   distribution tree, or in https://support.hdfgroup.org/ftp/HDF5/releases.  *
!   If you do not have access to either file, you may request a copy from     *
!   help@hdfgroup.org.                                                        *
! * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
!
!
! 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.
! Absolute and relative dataset names are used.
!
! This example is used in the HDF5 Tutorial.

PROGRAM H5_CRTGRPD

  USE HDF5 ! This module contains all necessary modules

  IMPLICIT NONE

  CHARACTER(LEN=10), PARAMETER :: filename = "groupsf.h5" ! File name
  CHARACTER(LEN=15), PARAMETER :: groupname = "MyGroup/Group_A" ! Group name
  CHARACTER(LEN=13), PARAMETER :: dsetname1 = "MyGroup/dset1"  ! Dataset name
  CHARACTER(LEN=5),  PARAMETER :: dsetname2 = "dset2" ! dataset name

  INTEGER(HID_T) :: file_id       ! File identifier
  INTEGER(HID_T) :: group_id      ! Group identifier
  INTEGER(HID_T) :: dataset_id    ! Dataset identifier
  INTEGER(HID_T) :: dataspace_id  ! Data space identifier

  INTEGER ::  i, j
  INTEGER ::   error ! Error flag

  INTEGER, DIMENSION(3,3) :: dset1_data  ! Data arrays
  INTEGER, DIMENSION(2,10) :: dset2_data !

  INTEGER(HSIZE_T), DIMENSION(2) :: dims1 = (/3,3/) ! Datasets dimensions
  INTEGER(HSIZE_T), DIMENSION(2) :: dims2 = (/2,10/)!
  INTEGER(HSIZE_T), DIMENSION(2) :: data_dims

  INTEGER     ::   rank = 2 ! Datasets rank

  !
  !Initialize dset1_data array
  !
  DO i = 1, 3
     DO j = 1, 3
        dset1_data(i,j) = j;
     END DO
  END DO

  !
  !Initialize dset2_data array
  !
  DO i = 1, 2
     DO j = 1, 10
        dset2_data(i,j) = j;
     END DO
  END DO

  !
  ! Initialize FORTRAN interface.
  !
  CALL h5open_f(error)

  !
  ! Open an existing file.
  !
  CALL h5fopen_f (filename, H5F_ACC_RDWR_F, file_id, error)

  !
  ! Create the data space for the first dataset.
  !
  CALL h5screate_simple_f(rank, dims1, dataspace_id, error)

  !
  ! Create a dataset in group "MyGroup" with default properties.
  !
  CALL h5dcreate_f(file_id, dsetname1, H5T_NATIVE_INTEGER, dataspace_id, &
       dataset_id, error)

  !
  ! Write the first dataset.
  !
  data_dims(1) = 3
  data_dims(2) = 3
  CALL h5dwrite_f(dataset_id, H5T_NATIVE_INTEGER, dset1_data, data_dims, error)

  !
  ! Close the dataspace for the first dataset.
  !
  CALL h5sclose_f(dataspace_id, error)

  !
  ! Close the first dataset.
  !
  CALL h5dclose_f(dataset_id, error)

  !
  ! Open an existing group in the specified file.
  !
  CALL h5gopen_f(file_id, groupname, group_id, error)

  !
  !Create the data space for the second dataset.
  !
  CALL h5screate_simple_f(rank, dims2, dataspace_id, error)

  !
  ! Create the second dataset in group "Group_A" with default properties.
  !
  CALL h5dcreate_f(group_id, dsetname2, H5T_NATIVE_INTEGER, dataspace_id, &
       dataset_id, error)

  !
  ! Write the second dataset.
  !
  data_dims(1) = 2
  data_dims(1) = 10
  CALL h5dwrite_f(dataset_id, H5T_NATIVE_INTEGER, dset2_data, data_dims, error)

  !
  ! Close the dataspace for the second dataset.
  !
  CALL h5sclose_f(dataspace_id, error)

  !
  ! Close the second dataset.
  !
  CALL h5dclose_f(dataset_id, error)

  !
  ! Close the group.
  !
  CALL h5gclose_f(group_id, error)

  !
  ! Close the file.
  !
  CALL h5fclose_f(file_id, error)

  !
  ! Close FORTRAN interface.
  !
  CALL h5close_f(error)

END PROGRAM H5_CRTGRPD
