NDF_TRACE - Set the internal NDF_ system error-tracing flag

Description:

The routine sets an internal flag in the NDF_ system which enables or disables error-tracing messages. If this flag is set to .TRUE., then any error occurring within the NDF_ system will be accompanied by error messages indicating which internal routines have exited prematurely as a result. If the flag is set to .FALSE., this internal diagnostic information will not appear and only standard error messages will be produced.

Invocation:

CALL NDF_TRACE( NEWFLG, OLDFLG )

Arguments:

NEWFLG = LOGICAL (Given)

The new value to be set for the error-tracing flag.

OLDFLG = LOGICAL (Returned)

The previous value of the flag.

Notes:

This routine is obsolete. The internal error tracing flag (referred to above) corresponds with the TRACE tuning parameter used by NDF_TUNE and NDF_GTUNE, so the same effect can be obtained by substituting these two routines.