The routine annuls the NDF identifier supplied so that it is no longer recognised as a valid identifier by the NDF_ routines. Any resources associated with it are released and made available for re-use. If any NDF components are mapped for access, then they are automatically unmapped by this routine.

CALL NDF_ANNUL( INDF, STATUS )

INDF = INTEGER (Given and Returned)

STATUS = INTEGER (Given and Returned)

• This routine attempts to execute even if STATUS is set on entry, although no further error report will be made if it subsequently fails under these circumstances. In particular, it will fail if the identifier supplied is not initially valid, but this will only be reported if STATUS is set to SAI__OK on entry.

• An error will result if an attempt is made to annul the last remaining identifier associated with an NDF whose DATA component has not been defined (unless it is a temporary NDF, in which case it will be deleted at this point).