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Diffstat (limited to 'fortran/examples/h5_subset.f90')
| -rw-r--r-- | fortran/examples/h5_subset.f90 | 184 |
1 files changed, 184 insertions, 0 deletions
diff --git a/fortran/examples/h5_subset.f90 b/fortran/examples/h5_subset.f90 new file mode 100644 index 0000000..6cb8f7a --- /dev/null +++ b/fortran/examples/h5_subset.f90 @@ -0,0 +1,184 @@ +! * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * +! 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 files COPYING and Copyright.html. COPYING can be found at the root * +! of the source code distribution tree; Copyright.html can be found at the * +! root level of an installed copy of the electronic HDF5 document set and * +! is linked from the top-level documents page. It can also be found at * +! http://hdfgroup.org/HDF5/doc/Copyright.html. 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 |