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183 lines
5.3 KiB
Fortran
183 lines
5.3 KiB
Fortran
! ************************************************************
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!
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! This example shows how to create a chunked dataset. The
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! program first writes integers in a hyperslab selection to
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! a chunked dataset with dataspace dimensions of DIM0xDIM1
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! and chunk size of CHUNK0xCHUNK1, then closes the file.
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! Next, it reopens the file, reads back the data, and
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! outputs it to the screen. Finally it reads the data again
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! using a different hyperslab selection, and outputs
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! the result to the screen.
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!
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! This file is intended for use with HDF5 Library version 1.8
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!
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! ************************************************************
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! An optional example for determining the correct HDF5 version
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! for picking the correct HDF5 API parameters. This is not
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! part of the HDF5 library.
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#include "h5_version.h"
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PROGRAM main
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USE HDF5
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IMPLICIT NONE
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CHARACTER(LEN=18), PARAMETER :: filename = "h5ex_d_chunk.h5"
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CHARACTER(LEN=3) , PARAMETER :: dataset = "DS1"
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INTEGER , PARAMETER :: dim0 = 6
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INTEGER , PARAMETER :: dim1 = 8
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INTEGER , PARAMETER :: chunk0 = 4
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INTEGER , PARAMETER :: chunk1 = 4
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INTEGER :: hdferr
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INTEGER :: layout
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INTEGER(HID_T) :: file, space, dset, dcpl ! Handles
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INTEGER(HSIZE_T), DIMENSION(1:2) :: dims = (/dim0, dim1/), chunk = (/chunk0,chunk1/)
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INTEGER(HSIZE_T), DIMENSION(1:2) :: start, stride, count, block
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INTEGER, DIMENSION(1:dim0, 1:dim1) :: wdata, & ! Write buffer
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rdata ! Read buffer
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INTEGER :: i, j
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!
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! Initialize FORTRAN interface.
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!
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CALL h5open_f(hdferr)
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! Initialize data to "1", to make it easier to see the selections.
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!
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wdata = 1
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!
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! Print the data to the screen.
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!
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WRITE(*, '(/,"Original Data:")')
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DO i=1, dim0
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WRITE(*,'(" [")', ADVANCE='NO')
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WRITE(*,'(80i3)', ADVANCE='NO') wdata(i,:)
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WRITE(*,'(" ]")')
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ENDDO
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!
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! Create a new file using the default properties.
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!
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CALL h5fcreate_f(filename, H5F_ACC_TRUNC_F, file, hdferr)
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!
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! Create dataspace. Setting maximum size to be the current size.
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!
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CALL h5screate_simple_f(2, dims, space, hdferr)
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!
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! Create the dataset creation property list, and set the chunk
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! size.
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!
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CALL h5pcreate_f(H5P_DATASET_CREATE_F, dcpl, hdferr)
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CALL h5pset_chunk_f(dcpl, 2, chunk, hdferr)
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!
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! Create the chunked dataset.
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!
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CALL h5dcreate_f(file, dataset, H5T_STD_I32LE, space, dset, hdferr, dcpl)
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!
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! Define and select the first part of the hyperslab selection.
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!
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start = 0
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stride = 3
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count(1:2) = (/2,3/)
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block = 2
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CALL h5sselect_hyperslab_f (space, H5S_SELECT_SET_F, start, count, &
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hdferr, stride, block)
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!
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! Define and select the second part of the hyperslab selection,
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! which is subtracted from the first selection by the use of
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! H5S_SELECT_NOTB
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!
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block = 1
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CALL h5sselect_hyperslab_f (space, H5S_SELECT_NOTB_F, start, count, &
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hdferr, stride, block)
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!
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! Write the data to the dataset.
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!
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CALL h5dwrite_f(dset, H5T_NATIVE_INTEGER, wdata, dims, hdferr, file_space_id=space)
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!
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! Close and release resources.
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!
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CALL h5pclose_f(dcpl , hdferr)
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CALL h5dclose_f(dset , hdferr)
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CALL h5sclose_f(space, hdferr)
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CALL h5fclose_f(file , hdferr)
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!
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! Now we begin the read section of this example.
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!
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!
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! Open file and dataset using the default properties.
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!
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CALL h5fopen_f(filename, H5F_ACC_RDONLY_F, file, hdferr)
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CALL h5dopen_f (file, dataset, dset, hdferr)
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!
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! Retrieve the dataset creation property list, and print the
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! storage layout.
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!
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CALL h5dget_create_plist_f(dset, dcpl, hdferr)
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CALL h5pget_layout_f(dcpl, layout, hdferr)
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WRITE(*,'(/,"Storage layout for ", A," is: ")', ADVANCE='NO') dataset
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IF(layout.EQ.H5D_COMPACT_F)THEN
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WRITE(*,'("H5D_COMPACT_F",/)')
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ELSE IF (layout.EQ.H5D_CONTIGUOUS_F)THEN
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WRITE(*,'("H5D_CONTIGUOUS_F",/)')
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ELSE IF (layout.EQ.H5D_CHUNKED_F)THEN
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WRITE(*,'("H5D_CHUNKED_F",/)')
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#if H5_VERSION_GE(1,12,0)
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ELSE IF (layout.EQ.H5D_VIRTUAL_F)THEN
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WRITE(*,'("H5D_VIRTUAL_F",/)')
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#endif
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ELSE
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WRITE(*,'("Layout Error",/)')
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ENDIF
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!
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! Read the data using the default properties.
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!
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CALL h5dread_f(dset, H5T_NATIVE_INTEGER, rdata, dims, hdferr)
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!
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! Output the data to the screen.
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!
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WRITE(*, '("Data as written to disk by hyberslabs:")')
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DO i=1, dim0
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WRITE(*,'(" [")', ADVANCE='NO')
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WRITE(*,'(80i3)', ADVANCE='NO') rdata(i,:)
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WRITE(*,'(" ]")')
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ENDDO
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!
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! Initialize the read array.
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!
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rdata = 0
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!
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! Define and select the hyperslab to use for reading.
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!
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CALL h5dget_space_f(dset, space, hdferr)
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start(1:2) = (/0,1/)
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stride = 4
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count = 2
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block(1:2) = (/2,3/)
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CALL h5sselect_hyperslab_f (space, H5S_SELECT_SET_F, start, count, &
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hdferr, stride, block)
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!
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! Read the data using the previously defined hyperslab.
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!
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CALL h5dread_f(dset, H5T_NATIVE_INTEGER, rdata, dims, hdferr, file_space_id=space)
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!
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! Output the data to the screen.
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!
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WRITE(*, '(/,"Data as read from disk by hyperslab:")')
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DO i=1, dim0
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WRITE(*,'(" [")', ADVANCE='NO')
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WRITE(*,'(80i3)', ADVANCE='NO') rdata(i,:)
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WRITE(*,'(" ]")')
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ENDDO
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!
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! Close and release resources.
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!
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CALL h5pclose_f(dcpl , hdferr)
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CALL h5dclose_f(dset , hdferr)
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CALL h5sclose_f(space, hdferr)
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CALL h5fclose_f(file , hdferr)
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END PROGRAM main
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