H5P_SET_DATA_TRANSFORM

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Sets a data transform expression

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Procedure:

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H5P_SET_DATA_TRANSFORM ( plist_id, expression )

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<pre><code class="language-c">herr_t H5Pset_data_transform (hid_t plist_id, const char *expression) </code></pre>

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<pre><code class="language-fortran">Fortran90 Interface: h5pset_data_transform_f

SUBROUTINE h5pset_data_transform_f(plist_id, expression, hdferr)
  IMPLICIT NONE
  INTEGER(HID_T), INTENT(IN) :: plist_id 
                                    ! Identifier of the property list or class
  CHARACTER(LEN=*), INTENT(IN) :: expression  
                                    ! Buffer to hold transform expression
  INTEGER, INTENT(OUT) :: hdferr    ! Error code
                                    ! 0 on success and -1 on failure
END SUBROUTINE h5pset_data_transform_f
    </code></pre>

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Parameters:

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hid_t `plist_id`	IN: Identifier of the property list or class
const char *`expression`	IN: Pointer to the null-terminated data transform expression

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Description:

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H5P_SET_DATA_TRANSFORM sets the data transform to be used for reading and writing data. This function operates on the dataset transfer property lists plist_id.

The expression parameter is a string containing an algebraic expression, such as (5/9.0)*(x-32) or x*(x-5). When a dataset is read or written with this property list, the transform expression is applied with the x being replaced by the values in the dataset. When reading data, the values in the file are not changed and the transformed data is returned to the user.

Data transforms can only be applied to integer or floating-point datasets. Order of operations is obeyed and the only supported operations are +, -, *, and /. Parentheses can be nested arbitrarily and can be used to change precedence.

When writing data back to the dataset, the transformed data is written to the file and there is no way to recover the original values to which the transform was applied.

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Returns:

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Success: a non-negative value

Failure: a negative value

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Example:

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repoSlug	hdf5
branchId	refs/heads/1.10/master
projectKey	HDFFV
filepath	examples/h5_dtransform.c
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applicationLink	5ac7b370-7412-3c8c-ad20-807a68261336

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repoSlug	hdf5-examples
branchId	refs/heads/master
projectKey	HDFFV
filepath	1_10/FORTRAN/H5D/h5ex_d_transform.f90
showLineNumbers	true
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applicationLink	5ac7b370-7412-3c8c-ad20-807a68261336

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History:

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Release	Change
1.8.0	Function introduced in this release.

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