NAG Library Routine Document
X04ABF returns the value of the current advisory message unit number, or sets the current advisory message unit number to a new value.
X04ABF enables those library routines which output advisory messages to determine the number of the output unit to which the advisory messages are to be sent; in this case X04ABF is called with
. X04ABF may also be called with
to set the unit number to a specified value. Otherwise a default value (stated in the Users' Note
for your implementation) is returned.
Records written to this output unit by other library routines are at most characters long (including a line-printer carriage control character), unless those library routines allow you to specify longer records.
Note that if the unit number is set , no messages will be output.
- 1: – INTEGERInput
: the action to be taken (see NADV
- 2: – INTEGERInput/Output
need not be set.
must specify the new advisory message unit number.
is set to the current advisory message unit number.
Note that Fortran unit numbers must be positive or zero. If NADV
, output of advisory messages is totally suppressed.
6 Error Indicators and Warnings
8 Parallelism and Performance
The time taken by X04ABF is negligible.
In this example X04ABF is called by your main program to make the advisory message from the routine DUMMY appear on the same unit as the rest of the output (unit
). Normally a NAG Library routine with an IFAIL parameter (see Section 3.3.2
in the Essential Introduction) would take the place of DUMMY.
10.1 Program Text
Program Text (x04abfe.f90)
10.2 Program Data
10.3 Program Results
Program Results (x04abfe.r)