NDG_NDFAS - Obtain an NDF identifier for an existing NDF

Description:

The routine returns an NDF identifier for an existing NDF. The name of the NDF is held at a given index within a given group. It is equivalent to NDF_ASSOC.

Invocation:

CALL NDG_NDFAS( IGRP, INDEX, MODE, INDF, STATUS )

Arguments:

IGRP = INTEGER (Given)

A GRP identifier for a group holding the names of NDFs. This will often be created using NDG_ASSOC, but groups created "by hand" using GRP directly (i.e. without the supplemental groups created by NDG_ASSOC) can also be used.

INDEX = INTEGER (Given)

The index within the group at which the name of the NDF to be accessed is stored.

MODE = CHARACTER $*$ ( $*$ ) (Given)

Type of NDF access required: 'READ', 'UPDATE' or 'WRITE'.

INDF = INTEGER (Returned)

NDF identifier.

STATUS = INTEGER (Given and Returned)

The global status.

Notes:

• If this routine is called with STATUS set, then a value of NDF__NOID will be returned for the INDF argument, although no further processing will occur. The same value will also be returned if the routine should fail for any reason. The NDF__NOID constant is defined in the include file NDF_PAR.