Name: H5Dcreate
Signature:
  hid_t `H5Dcreate`(hid_t `loc_id`, const char *`name`, hid_t `type_id`, hid_t `space_id`, hid_t `create_plist_id` )
Purpose:
  Creates a dataset at the specified location.
Description:
  `H5Dcreate` creates a data set with a name, `name`, in the file or in the group specified by the identifier `loc_id`. The dataset has the datatype and dataspace identified by `type_id` and `space_id`, respectively. The specified datatype and dataspace are the datatype and dataspace of the dataset as it will exist in the file, which may be different than in application memory. Dataset creation properties are specified by the argument `create_plist_id`.

  Dataset names within a group are unique: `H5Dcreate` will return an error if a dataset with the name specified in `name` already exists at the location specified in `loc_id`.

  As is the case for any object in a group, the length of a dataset name is not limited.

  `create_plist_id` is a `H5P_DATASET_CREATE` property list created with `H5Pcreate` and initialized with the various functions described above.

  `H5Dcreate` returns an error if the dataset's datatype includes a variable-length (VL) datatype and the fill value is undefined, i.e., set to `NULL` in the dataset creation property list. Such a VL datatype may be directly included, indirectly included as part of a compound or array datatype, or indirectly included as part of a nested compound or array datatype.

  `H5Dcreate` returns a dataset identifier for success or a negative value for failure. The dataset identifier should eventually be closed by calling `H5Dclose` to release resources it uses.

  Fill values and space allocation:
  The HDF5 library provides flexible means of specifying a fill value, of specifying when space will be allocated for a dataset, and of specifying when fill values will be written to a dataset. For further information on these topics, see the document Fill Value and Dataset Storage Allocation Issues in HDF5 and the descriptions of the following HDF5 functions in this HDF5 Reference Manual:

  | `H5Dfill` `H5Pset_fill_value` `H5Pget_fill_value` `H5Pfill_value_defined` | `H5Pset_fill_time` `H5Pget_fill_time` `H5Pset_alloc_time` `H5Pget_alloc_time`

  This information is also included in the “HDF5 Datasets” chapter of the new HDF5 User's Guide, which is being prepared for release.
Note:
  `H5Dcreate` can fail if there has been an error in setting up an element of the dataset creation property list. In such cases, each item in the property list must be examined to ensure that the setup satisfies to all required conditions. This problem is most likely to occur with the use of filters.

  For example, `H5Dcreate` will fail without a meaningful explanation if

  - SZIP compression is being used on the dataset and
  - the SZIP parameter `pixels_per_block` is set to an inappropriate value.

  In such a case, one would refer to the description of `H5Pset_szip`, looking for any conditions or requirements that might affect the local computing environment.

Parameters:

hid_t `loc_id` | IN: Identifier of the file or group within which to create the dataset.
const char * `name` | IN: The name of the dataset to create.
hid_t `type_id` | IN: Identifier of the datatype to use when creating the dataset.
hid_t `space_id` | IN: Identifier of the dataspace to use when creating the dataset.
hid_t `create_plist_id` | IN: Identifier of the set creation property list.

Returns:
  Returns a dataset identifier if successful; otherwise returns a negative value.
Fortran90 Interface: h5dcreate_f

      SUBROUTINE h5dcreate_f(loc_id, name, type_id, space_id, dset_id, &
                             hdferr, creation_prp)
        IMPLICIT NONE
        INTEGER(HID_T), INTENT(IN) :: loc_id   ! File or group identifier
        CHARACTER(LEN=*), INTENT(IN) :: name   ! Name of the dataset
        INTEGER(HID_T), INTENT(IN) :: type_id  ! Datatype identifier
        INTEGER(HID_T), INTENT(IN) :: space_id ! Dataspace identifier
        INTEGER(HID_T), INTENT(OUT) :: dset_id ! Dataset identifier
        INTEGER, INTENT(OUT) :: hdferr         ! Error code
                                               ! 0 on success and -1 on failure
        INTEGER(HID_T), OPTIONAL, INTENT(IN) :: creation_prp
                                               ! Dataset creation propertly
                                               ! list identifier , default
                                               ! value is H5P_DEFAULT_F (6)
      END SUBROUTINE h5dcreate_f