The routine deletes a specified range of records from an NDF history component. The remaining records are re-numbered starting from 1.

CALL NDF_HPURG( INDF, IREC1, IREC2, STATUS )

INDF = INTEGER (Given)

IREC1 = INTEGER (Given)

IREC2 = INTEGER (Given)

STATUS = INTEGER (Given and Returned)

• This routine is provided primarily to allow a lengthy NDF history to be truncated in order to save space. To avoid deceiving subsequent readers, it is normally advisable not to delete arbitrary sections of an NDF’s history, but to delete only the earliest part (by setting IREC1 to 1).

• The IREC1 and IREC2 arguments must both identify valid history records which are actually present. Their values may be interchanged without affecting the behaviour of this routine.