- Created by Barbara Jones, last modified on May 03, 2019
H5S_SELECT_ELEMENTS
Selects array elements to be included in the selection for a dataspace
Procedure:
H5S_SELECT_ELEMENTS ( space_id, op, num_elements, coord )
Signature:
herr_t H5Sselect_elements(
hid_t space_id,
H5S_seloper_t op,
size_t num_elements,
const hsize_t *coord
)
Fortran90 Interface: h5sselect_elements_f
SUBROUTINE h5sselect_elements_f(space_id, operator, rank, num_elements,
coord, hdferr)
IMPLICIT NONE
INTEGER(HID_T), INTENT(IN) :: space_id ! Dataspace identifier
INTEGER, INTENT(IN) :: operator ! Flag, valid values are:
! H5S_SELECT_SET_F
! H5S_SELECT_APPEND_F
! H5S_SELECT_PREPEND_F
INTEGER, INTENT(IN) :: rank ! Number of dataspace
! dimensions
INTEGER(SIZE_T), INTENT(IN) :: num_elements
! Number of elements to be
! selected
INTEGER(HSIZE_T), DIMENSION(rank,num_elements), INTENT(IN) :: coord
! A 1-based array containing the
! coordinates of the selected
! elements
! NOTE: Reversed dimension declaration
! compared to the C specification
! of coord(num_elements, rank)
INTEGER, INTENT(OUT) :: hdferr ! Error code
! 0 on success and -1 on failure
END SUBROUTINE h5sselect_elements_f
Parameters:
hid_t space_id | IN: Identifier of the dataspace |
H5S_seloper_t op | IN: Operator specifying how the new selection is to be combined with the existing selection for the dataspace |
size_t num_elements | IN: Number of elements to be selected |
const hsize_t *coord | IN: A pointer to a buffer containing a serialized copy of a 2-dimensional array of zero-based values specifying the coordinates of the elements in the point selection |
Description:
H5S_SELECT_ELEMENTS selects array elements to be included in the selection for the space_id dataspace. This is referred to as a point selection.
The number of elements selected is set in the num_elements parameter.
The coord parameter is a pointer to a buffer containing a serialized 2-dimensional array of size num_elements by the rank of the dataspace. The array lists dataset elements in the point selection; that is, it’s a list of of zero-based values specifying the coordinates in the dataset of the selected elements. The order of the element coordinates in the coord array specifies the order in which the array elements are iterated through when I/O is performed. Duplicate coordinate locations are not checked for. See below for examples of the mapping between the serialized contents of the buffer and the point selection array that it represents.
The selection operator op determines how the new selection is to be combined with the previously existing selection for the dataspace. The following operators are supported:
H5S_SELECT_SET | Replaces the existing selection with the parameters from this call. Overlapping blocks are not supported with this operator. Adds the new selection to the existing selection. |
H5S_SELECT_APPEND | Adds the new selection following the last element of the existing selection. |
H5S_SELECT_PREPEND | Adds the new selection preceding the first element of the existing selection. |
Mapping the serialized coord buffer to a 2-dimensional point selection array: To illustrate the construction of the contents of the coord buffer, consider two simple examples: a selection of 5 points in a 1-dimensional array and a selection of 3 points in a 4-dimensional array.
In the 1D case, we will be selecting five points and a 1D dataspace has rank 1, so the selection will be described in a 5-by-1 array. To select the 1st, 14th, 17th, 23rd, 8th elements of the dataset, the selection array would be as follows (remembering that point coordinates are zero-based):
0
13
16
22
7 This point selection array will be serialized in the coord buffer as:
0 13 16 22 7
In the 4D case, we will be selecting three points and a 4D dataspace has rank 4, so the selection will be described in a 3-by-4 array. To select the points (1,1,1,1), (14,6,12,18), and (8,22,30,22), the point selection array would be as follows:
0 0 0 0
13 5 11 17
7 21 29 21This point selection array will be serialized in the coord buffer as:
0 0 0 0 13 5 11 17 7 21 29 21
Returns:
Returns a non-negative value if successful; otherwise returns a negative value.
Example:
Include Bitbucket Server for Confluence: An error occured
Connection to Bitbucket Server could not be established. Verify that you have properly configured the Bitbucket Server application link for your Confluence space and that your Bitbucket Server instance is up and running. Error details: javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
Include Bitbucket Server for Confluence: An error occured
Connection to Bitbucket Server could not be established. Verify that you have properly configured the Bitbucket Server application link for your Confluence space and that your Bitbucket Server instance is up and running. Error details: javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
History:
| Release | Change |
|---|---|
| 1.6.4 | C coord parameter type changed to const hsize_t. Fortran coord parameter type changed to INTEGER(HSIZE_T). |
--- Last Modified: May 03, 2019 | 02:34 PM