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! * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
! 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 write and read a hyperslab.
! It is used in the HDF5 Tutorial.
!
PROGRAM H5_SUBSET
USE HDF5 ! This module contains all necessary modules
IMPLICIT NONE
CHARACTER(LEN=9), PARAMETER :: filename = "subset.h5" ! File name
CHARACTER(LEN=8), PARAMETER :: dsetname = "IntArray" ! Dataset name
INTEGER(HID_T) :: file_id ! File identifier
INTEGER(HID_T) :: dset_id ! Dataset identifier
INTEGER(HID_T) :: dataspace ! Dataspace identifier
INTEGER(HID_T) :: memspace ! memspace identifier
!
! To change the subset size, modify size of dimsm, sdata, dim0_sub,
! dim1_sub, and count
!
INTEGER(HSIZE_T), DIMENSION(1:2) :: dimsm = (/4,3/) ! Dataset dimensions
INTEGER, DIMENSION(1:4,1:3) :: sdata ! Subset buffer
INTEGER :: dim0_sub = 4
INTEGER :: dim1_sub = 3
INTEGER(HSIZE_T), DIMENSION(1:2) :: count = (/4,3/) ! Size of hyperslab
INTEGER(HSIZE_T), DIMENSION(1:2) :: offset = (/2,1/) ! Hyperslab offset
INTEGER(HSIZE_T), DIMENSION(1:2) :: stride = (/1,1/) ! Hyperslab stride
INTEGER(HSIZE_T), DIMENSION(1:2) :: block = (/1,1/) ! Hyperslab block size
INTEGER(HSIZE_T), DIMENSION(1:2) :: dimsf = (/10,8/) ! Dataset dimensions
INTEGER, DIMENSION(1:10,1:8) :: data ! Data to write
INTEGER, DIMENSION(1:10,1:8) :: rdata ! Data to read
INTEGER :: rank = 2 ! Dataset rank ( in file )
INTEGER :: dim0 = 10 ! Dataset size in file
INTEGER :: dim1 = 8
INTEGER :: i, j
INTEGER :: error ! Error flag
INTEGER(HSIZE_T), DIMENSION(2) :: data_dims
!
! Write data to the HDF5 file.
!
!
! Data initialization.
!
DO i = 1, dim0
DO j = 1, dim1
IF (i .LE. (dim0 / 2)) THEN
data(i,j) = 1
ELSE
data(i,j) = 2
END IF
END DO
END DO
!
! Initialize FORTRAN interface.
!
CALL h5open_f(error)
!
! Create a new file using default properties.
!
CALL h5fcreate_f(filename, H5F_ACC_TRUNC_F, file_id, error)
!
! Create the data space for the dataset.
!
CALL h5screate_simple_f(rank, dimsf, dataspace, error)
!
! Create the dataset with default properties.
!
CALL h5dcreate_f(file_id, dsetname, H5T_NATIVE_INTEGER, dataspace, &
dset_id, error)
!
! Write the dataset.
!
data_dims(1) = dim0
data_dims(2) = dim1
CALL h5dwrite_f(dset_id, H5T_NATIVE_INTEGER, data, data_dims, error)
!
! Data Written to File
!
WRITE(*,'(/,A)') "Original Data Written to File:"
DO i = 1, dim0
WRITE(*,'(100(1X,I0,1X))') DATA(i,1:dim1)
END DO
!
!
! Close the dataspace, dataset, and file.
!
CALL h5sclose_f(dataspace, error)
CALL h5dclose_f(dset_id, error)
CALL h5fclose_f(file_id, error)
!
! Initialize subset data array.
!
sdata(1:dim0_sub,1:dim1_sub) = 5
!
! Open the file.
!
CALL h5fopen_f(filename, H5F_ACC_RDWR_F, file_id, error)
!
! Open the dataset.
!
CALL h5dopen_f(file_id, dsetname, dset_id, error)
!
! Get dataset's dataspace identifier and select subset.
!
CALL h5dget_space_f(dset_id, dataspace, error)
CALL h5sselect_hyperslab_f(dataspace, H5S_SELECT_SET_F, &
offset, count, error, stride, BLOCK)
!
! Create memory dataspace.
!
CALL h5screate_simple_f(rank, dimsm, memspace, error)
WRITE(*,'(/,A)') "Write subset to file specifying:"
WRITE(*,'(A,/)') " offset=2x1 stride=1x1 count=4x3 block=1x1"
!
! Write subset to dataset
!
data_dims(1:2) = (/dim0_sub, dim1_sub/)
CALL h5dwrite_f(dset_id, H5T_NATIVE_INTEGER, sdata, data_dims, error, &
memspace, dataspace)
data_dims(1:2) = (/dim0, dim1/)
CALL h5dread_f(dset_id, H5T_NATIVE_INTEGER, rdata, data_dims, error)
!
! Read entire dataset back
!
WRITE(*,'(A)') "Data in File after Subset Written:"
DO i = 1, dim0
WRITE(*,'(100(1X,I0,1X))') rdata(i,1:dim1)
END DO
PRINT *, " "
!
! Close everything opened.
!
CALL h5sclose_f(dataspace, error)
CALL h5sclose_f(memspace, error)
CALL h5dclose_f(dset_id, error)
CALL h5fclose_f(file_id, error)
!
! Close FORTRAN interface.
!
CALL h5close_f(error)
END PROGRAM H5_SUBSET
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