NAG fl90, Release 4


IBM RS/6000 Power Systems, xlf90/64-bit, AIX 5L

Installer's Note


1. Introduction

This document is essential reading for whoever is responsible for the installation of the NAG fl90 implementation specified in the title. The installer will be supplied with a printed copy of this document. Both this (in.html) and the Users' Note (un.html) are supplied in the doc directory on the distribution medium.

Whenever the NAG fl90 has been supplied in compiled form, that form is considered to be the standard library file. The use of all supplied software must be in accordance with the terms and conditions of the Software Licence signed by NAG and each site. Any request to use NAG software on a computer other than the one licensed must be referred to NAG (see Section 6).

2. Implementation Provided

2.1. Applicability

This implementation is a compiled, tested, ready-to-use version of NAG fl90 that is considered suitable for operation on the computer systems detailed below:

hardware:         IBM RS/6000 64 bit Power systems or compatible
operating system: AIX 5L v5.1 or compatible
Fortran compiler: IBM xlf90 version or compatible

For information about implementations of NAG fl90 for use on other computer systems please contact NAG.

2.2. Derivation

This implementation was produced at NAG Ltd., Oxford on the computing system detailed below:

hardware:         IBM RS/6000 Power3 system
operating system: AIX 5L v5.1
Fortran compiler: IBM xlf90 version
compiler options: -q64 -qarch=com -O3 -qstrict -u

The entire NAG fl90 library, Release 4, was compiled with optimization level -O3 -qstrict , except for the following procedure, which had to be compiled with optimization level -O2 :


3. Distribution Medium

3.1. Recording Details

The implementation is distributed in tar format on CD-ROM, unless otherwise indicated on the medium and accompanying despatch note.

For further details, refer to other documentation supplied or contact NAG (see Section 6).

3.2. Contents

The following shows the directory/file organization of the library materials as they will be installed.
                      |-- in.html
            |-- doc --|-- un.html
            |         |-- nag_fn_un.3
            |-- libnagfl90.a
            |-- libnagfl90_noblas.a
            |-- nag_mod_dir --|-- *.mod
fnib304db --|
            |              |-- source ---|-- *.f90
            |-- examples --|-- data -----|-- *.dat
            |              |-- results --|-- *.r
            |-- scripts ---|-- nagexample
                           |-- nagexample_noblas

libnagfl90.a is the compiled library including the NAG version of the BLAS procedures while libnagfl90_noblas.a does not contain the NAG version of the BLAS procedures and MUST be used with the vender library essl.

The examples results given in the directory results are those obtained using libnagfl90.a. Using libnagfl90_noblas.a and essl may produce slightly different results.

The following shows the directory/file organization of the PDF documentation materials as they will be installed.

         |-- images --|-- *.gif
         |                   |-- release4.html  (main index)
         |                   |
         |                   |-- genint --|-- *.html  (introductory material)
NAGdoc --|        |-- html --|
         |        |          |-- library_contents --|-- *.html
         |        |          |
         |        |          |-- [c01-c29]_fn04.html  (chapter indexes)
         |-- fn --|
                  |         |-- genint --|-- *.pdf  (introductory material)
                  |         |
                  |         |-- library_contents --|-- *.pdf
                  |-- pdf --|
                            |-- indexes --|-- *.pdf  (KWIC and GAMS)
                            |-- [c01-c29] --|-- *.pdf  (chapter, module
                                                        and procedure files)

3.3. File Sizes

The files require approximately the following disk space:
compiled library:                      15.0 Mb
compiled library (without NAG's BLAS): 14.6 Mb
module information files:              18.2 Mb
example program material:               4.3 Mb
library documentation files:            0.1 Mb
scripts:                                0.1 Mb
PDF documentation files:               20.2 Mb

4. Installation

4.1. Library Installation

To install all library material use the Unix tar utility, e.g.

tar xvf /cdrom/fn04.tar
(assuming the CD-ROM has been mounted as /cdrom).

The appropriate object library (libnagfl90.a or libnagfl90_noblas.a) should be moved to a directory, such as /usr/lib, in the default search path of the linker, if possible, so that linkage is convenient. Alternatively, a symbolic link could be made to them, e.g.

ln -s /fnib304db/libnagfl90.a  /usr/lib/libnagfl90.a
ln -s /fnib304db/libnagfl90_noblas.a  /usr/lib/libnagfl90_noblas.a

The module information files (nag_mod_dir/*.mod) are supplied in pre-compiled module form. They should be moved to a suitable location so that access is convenient, e.g.

mkdir /usr/local/lib/fl90_modules
mv nag_mod_dir/* /usr/local/lib/fl90_modules
or, a symbolic link could be made to them, e.g.
ln -s /fnib304db/nag_mod_dir  /usr/local/lib/fl90_modules

The -I"pathname" option should then be specified on each xlf90 invocation (where "pathname" is /usr/local/lib/fl90_modules) to tell the compiler where to find the modules.

Alternatively, the files may be moved to the same directory as the pre-defined modules supplied with the compiler.

The scripts nagexample and nagexample_noblas refer to the local directory containing the example programs. The appropriate file should be copied to (for example) /usr/local/bin, modified to reflect the local installation, and its protection set to world execute.

The man page, which directs users to the HTML form of the Users' Note, should be moved to a directory in the man search path, e.g.

cd doc
mv nag_fn_un.3 /usr/man/man3

4.2. PDF Documentation Installation

To install all PDF documentation material, use the Unix tar utility, e.g.
tar xvf /cdrom/pdf.tar
(assuming the CD-ROM has been mounted as /cdrom).

You may wish to move the PDF documentation files to the same location as that for other NAG products. You are encouraged to make them readily available to users, but in such a way that they are not generally accessible from outside your site.

4.3. Checking Accessibility

The installer should ensure that the advice given to users in Section 3.1 of the Users' Note (un.html) is suitable for the installation. This can be done by running a few example programs following that advice. The installation can also be tested using the scripts nagexample and nagexample_noblas.

4.4. Release to Users

The Users' Note (un.html) should be checked and amended as necessary (particularly Section 3.1). It can then be made available to users directly, or be absorbed into local access information.

The following material should also be made accessible to users:

one of the compiled libraries:

module information files:
example program material:
and, as appropriate
pdf documentation files

Note that the example material has been adapted, if necessary, from that printed in the NAG fl90 Manual, so that programs are suitable for execution with this implementation with no further changes. Making the example material directly available to users provides them with easily adaptable templates for their own problems.

4.5. Maintenance Level

The maintenance level of the library can be determined by writing a simple program to call procedure nag_lib_ident, which prints out details of the implementation, including title and product code, compiler and precision used, release and maintenance level.

5. Documentation

Each supported NAG fl90 site is currently provided with a printed copy of the NAG fl90 Manual (or Update). Additional copies are available for purchase; please refer to the NAG documentation order form (available on the NAG websites, see Section 6 (c)) for details of current prices.

On-line documentation is provided, in PDF form, with this implementation. Please see the Readme file on the distribution medium for further information.

6. Support from NAG

(a) Contact with NAG

Queries concerning this document or the implementation generally should be directed initially to your local Advisory Service. If you have difficulty in making contact locally, you can contact NAG directly at one of the addresses given in the Appendix. Users subscribing to the support service are encouraged to contact one of the NAG Response Centres (see below).

(b) NAG Response Centres

The NAG Response Centres are available for general enquiries from all users and also for technical queries from sites with an annually licensed product or support service.

The Response Centres are open during office hours, but contact is possible by fax, email and phone (answering machine) at all times.

When contacting a Response Centre please quote your NAG site reference and NAG product code (FNIB304DB).

(c) NAG Websites

The NAG websites are an information service providing items of interest to users and prospective users of NAG products and services. The information is reviewed and updated regularly and includes implementation availability, descriptions of products, downloadable software, product documentation and technical reports. The NAG websites can be accessed at

or (in North America)

or (in Japan)

(d) NAG Electronic Newsletter

If you would like to be kept up to date with news from NAG you may want to register to receive our electronic newsletter, which will alert you to special offers, announcements about new products or product/service enhancements, case studies and NAG's event diary. To register visit one of our websites or contact us at

7. User Feedback

Many factors influence the way NAG's products and services evolve and your ideas are invaluable in helping us to ensure that we meet your needs. If you would like to contribute to this process we would be pleased to receive your comments by email at Alternatively contact the appropriate NAG Response Centre who will be happy to record your comments.

Appendix - Contact Addresses

Wilkinson House
Jordan Hill Road
OXFORD  OX2 8DR                         NAG Ltd Response Centre
United Kingdom                          email:

Tel: +44 (0)1865 511245                 Tel: +44 (0)1865 311744
Fax: +44 (0)1865 310139                 Fax: +44 (0)1865 310139

1431 Opus Place, Suite 220
Downers Grove
IL 60515-1362                           NAG Inc Response Center
USA                                     email:

Tel: +1 630 971 2337                    Tel: +1 630 971 2345
Fax: +1 630 971 2706                    Fax: +1 630 971 2706

Nihon NAG KK
Hatchobori Frontier Building 2F

Tel: +81 (0)3 5542 6311
Fax: +81 (0)3 5542 6312