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1.1     ! root        1: .TI F77/NAG_LIB "Sep. 4, 1985"
        !             2: NAG Library of Mathematical and Statistical Procedures
        !             3: 
        !             4: The NAG library, which includes about 500 Fortran callable subroutines,
        !             5: is available for VAX UNIX.  There are both single and double precision
        !             6: versions; check with your system administrator to see if your system
        !             7: has the NAG library, and how to access it.  Your administrator can also
        !             8: tell you where the documentation (6 volumes) is kept.  The rest of
        !             9: this write-up assumes you have the double precision version,
        !            10: accessed as '-lnagd'.
        !            11: 
        !            12: While NAG includes mainly mathematical and statistical routines,
        !            13: the library also includes sorting routines in chapter M01 and
        !            14: machine and mathematical constant routines in chapter X.
        !            15: To use the double precision version, specify '-lnagd' to f77:
        !            16: 
        !            17:        f77 prog.f -lnagd
        !            18: 
        !            19: If the NAG library does not include a subroutine for what you are
        !            20: doing, see "help f77 libraries" for information on other libraries.
        !            21: 
        !            22: The NAG manual is written to be applicable to both single and double
        !            23: precision versions of the library.  Generally you will have to supply
        !            24: double precision arguments.  Where the documentation indicates "real"
        !            25: in italics, use 'double precision' on VAX UNIX.  If you have written
        !            26: your program in single precision, see "help f77 to_double" to see what
        !            27: changes are needed to use double precision.
        !            28: 
        !            29: There are five common errors in using NAG routines:
        !            30: 
        !            31: .IP "1."
        !            32: Using single precision when double precision is required.
        !            33: 
        !            34: .IP "2."
        !            35: Not checking the error flag.  Most routines have an error flag that
        !            36: NAG sets to an error value when something goes wrong; it is your
        !            37: responsibility to check it.
        !            38: 
        !            39: .IP "3."
        !            40: Omitting arguments.  NAG routines often have many
        !            41: arguments that are required even if you don't use the result.
        !            42: 
        !            43: .IP "4."
        !            44: Not dimensioning arguments.  Especially make sure work areas are
        !            45: appropriately dimensioned.
        !            46: 
        !            47: .IP "5."
        !            48: Supplying incorrect 'row dimension' of matrices.  Many NAG routines
        !            49: have a calling sequence of the form:
        !            50: 
        !            51:              call sub( a, ia, n, ... )
        !            52: 
        !            53: where 'a' is a matrix, 'ia' is it's first dimension as declared in
        !            54: the calling program, and 'n' is it's order.
        !            55: \&'ia' and 'n' are often different and must be specified correctly.

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