NAG C Library, Mark 7

CLL6407DAL - License Managed

Intel IA-64, Linux, GNU C

Users' Note



Contents


1. Introduction

This document is essential reading for every user of the NAG C Library Implementation specified in the title. It provides implementation-specific detail that augments the information provided in the NAG C Library Manual and Introductory Guide. Wherever those manuals refer to the "Users' Note for your implementation", you should consult this note.

In addition, NAG recommends that before calling any library routine you should read the following reference material (see Section 5):

(a) Essential Introduction
(b) Chapter Introduction
(c) Function Document

2. Availability of Functions

All functions listed in the chapter contents documents of the NAG C Library Manual, Mark 7 are available in this implementation. At Mark 7, 397 new primary ("user-callable") functions have been introduced. Please consult Mark 7 News (see Section 5) for lists of these functions and for a list of functions scheduled for withdrawal at future Marks. Your suggestions for new algorithms for future releases of the Library are welcomed (see Section 7).

3. General Information

3.1. Accessing the Library

Assuming that libnagc.a or libnagc.so has been installed in a directory in the search path of the linker, such as /usr/lib, and that the NAG include files have been moved to /usr/include, then you may link to the NAG C Library in the following manner: 

gcc driver.c -lnagc -lpthread -lm
where driver.c is your application program.

If ths NAG Library is not installed on the search path of the linker, you can specify its location using the -L flag; for example, if it is installed in the directory /cll6407dal: 

gcc driver.c -L/cll6407dal -lnagc -lpthread -lm

Note that the NAG C Library is supplied in both static and shareable versions (libnagc.a and libnagc.so.7 respectively), and also that libnagc.so.7 should have a link to it called libnagc.so in the same directory. The shareable library will be used by default. It is possible that the shareable libraries have been placed in a directory in the search path of the linker, but not the search path of the run-time linker (e.g. /usr/local/lib). If this is so then the above compilation command will result in the program failing at run-time and should be replaced with, for example 

gcc driver.c -Wl,-rpath,/usr/local/lib -lnagc  -lpthread -lm
The use of the -Wl,-rpath option in the compilation command can be avoided if the environment variable LD_LIBRARY_PATH is set as follows: 
 
setenv LD_LIBRARY_PATH /usr/local/lib

If the include files are in a location other than /usr/include, such as /usr/local/include, then you may link to the NAG C Library in the following manner: 

gcc -I/usr/local/include driver.c -lnagc -lpthread -lm

3.2. Example Programs

The example programs are most easily accessed by the command nagexample, which will provide you with a copy of an example program (and its data, if any), compile the program and link it with the library (showing you the compile command so that you can recompile your own version of the program). Finally, the executable program will be run, presenting its output to stdout. The example program concerned is specified by the argument to nagexample, e.g. 
nagexample c06eac
will copy the example program and its data into the files c06eace.c and c06eace.d in the current directory and process them to produce the example program results.

The example programs supplied to a site in machine-readable form have been modified as necessary so that they are suitable for immediate execution. Note that the distributed example programs are those used in this implementation and may not correspond exactly with the programs published in the manual. The distributed example programs should be used in preference wherever possible.

The distributed example results are those obtained with the NAG static library.

4. Function-specific Information

Any further information which applies to one or more functions in this implementation is listed below, chapter by chapter.

(a) s10 - s21

Functions in this chapter will give error messages if called with illegal or unsafe arguments. General details are given in the NAG C Library Manual, but parameter limits which are implementation specific are given below: 
s10aac  E(1)      = 18.500
s10abc  fail.code = NE_REAL_ARG_GT if X > 708.0
s10acc  fail.code = NE_REAL_ARG_GT if X > 708.0
 
s13aac  x(hi)     = 708.3
s13acc  x(hi)     = 1.0e+16
s13adc  x(hi)     = 1.0e+17
 
s14aac  fail.code = NE_REAL_ARG_GT if X > 170.
        fail.code = NE_REAL_ARG_LT if X < -170.
        fail.code = NE_REAL_ARG_TOO_SMALL if ABS(X) < 2.23e-308
s14abc  fail.code = NE_REAL_ARG_GT if X > 2.55e+305
 
s17acc  fail.code = NE_REAL_ARG_GT if X > 1.0e+16
s17adc  fail.code = NE_REAL_ARG_GT if X > 1.0e+16
        fail.code = NE_REAL_ARG_TOO_SMALL if X <= 2.23e-308
s17aec  fail.code = NE_REAL_ARG_GT if ABS(X) > 1.0e+16
s17afc  fail.code = NE_REAL_ARG_GT if ABS(X) > 1.0e+16
s17agc  fail.code = NE_REAL_ARG_GT if X > 103.8
        fail.code = NE_REAL_ARG_LT if X < -5.6e+10
s17ahc  fail.code = NE_REAL_ARG_GT if X > 104.1
        fail.code = NE_REAL_ARG_LT if X < -5.6e+10
s17ajc  fail.code = NE_REAL_ARG_GT if X > 104.1
        fail.code = NE_REAL_ARG_LT if X < -1.8e+9
s17akc  fail.code = NE_REAL_ARG_GT if X > 104.1
        fail.code = NE_REAL_ARG_LT if X < -1.8e+9
 
s18adc  fail.code = NE_REAL_ARG_TOO_SMALL if 0.0D+00 < X <= 2.23e-308
s18aec  fail.code = NE_REAL_ARG_GT if ABS(X) > 711.6
s18afc  fail.code = NE_REAL_ARG_GT if ABS(X) > 711.6
s18cdc  fail.code = NE_REAL_ARG_TOO_SMALL if 0.0D+00 < X <= 2.23e-308
 
s19aac  fail.code = NE_REAL_ARG_GT if ABS(X) >= 49.5000
s19abc  fail.code = NE_REAL_ARG_GT if ABS(X) >= 49.5000
s19acc  fail.code = NE_REAL_ARG_GT if X > 997.26
s19adc  fail.code = NE_REAL_ARG_GT if X > 997.26

s21bcc  fail.code = NE_REAL_ARG_LT if an argument <  1.579e-205
        fail.code = NE_REAL_ARG_GE if an argument >= 3.774e+202
s21bdc  fail.code = NE_REAL_ARG_LT if an argument <  2.820e-103
        fail.code = NE_REAL_ARG_GT if an argument >  1.404e+102

(b) x01

The values of the mathematical constants are provided in the header file nagx01.h: 
X01AAC (pi)    = 3.1415926535897932
X01ABC (gamma) = 0.5772156649015329

(c) x02

The values of the machine constants are provided in the header file nagx02.h:

The basic parameters of the model 

X02BHC =  2
X02BJC = 53
X02BKC = -1021
X02BLC = 1024
X02DJC = true
Derived parameters of the floating-point arithmetic 
X02AJC = 1.11022302462516e-16
X02AKC = 2.22507385850720e-308
X02ALC = 1.79769313486232e+308
X02AMC = 2.22507385850720e-308
X02ANC = 2.22507385850733e-308
Parameters of other aspects of the computing environment 
X02AHC = 1.42724769270596e+45
X02BBC = 9223372036854775807
X02BEC = 15
X02DAC = false

5. Documentation

Each supported NAG C Library site is ordinarily provided with a printed copy of the NAG C Library Introductory Guide. Additional documentation is available for purchase; please refer to the NAG websites or contact your local NAG Response Centre for current prices (see Section 6).

A full online version of the NAG C Library Manual is supplied in the form of Portable Document Format (PDF) files, with an HTML index, in the NAGdoc directory. The introductory material is also provided as HTML files in the NAGdoc directory.

A main index file has been provided (NAGdoc/cl/html/mark7.html) which contains a fully linked contents document pointing to all the available PDF (and where available HTML) files. Use your HTML browser to navigate from here.

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 it helps us deal with your enquiry quickly if you can quote your NAG site reference and NAG product code (in this case CLL6407DAL).

(c) NAG Websites

The NAG websites provide information about implementation availability, descriptions of products, downloadable software, product documentation and technical reports. The NAG websites can be accessed at the following URLs:

http://www.nag.co.uk/, http://www.nag.com/ (in North America) or http://www.nag-j.co.jp/ (in Japan)

(d) NAG Electronic Newsletter

If you would like to be kept up to date with news from NAG then please register to receive our free electronic newsletter, which will alert you to special offers, announcements about new products or product/service enhancements, customer stories and NAG's event diary. You can register via one of our websites, or by contacting us at nagnews@nag.co.uk.

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 delighted to receive your comments. Please contact your local NAG Response Centre (shown below).

Appendix - Contact Addresses

NAG Ltd
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OXFORD  OX2 8DR                         NAG Ltd Response Centre
United Kingdom                          email: support@nag.co.uk
 
Tel: +44 (0)1865 511245                 Tel: +44 (0)1865 311744
Fax: +44 (0)1865 310139                 Fax: +44 (0)1865 310139
 
NAG Inc
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Downers Grove
IL 60515-1362                           NAG Inc Response Center
USA                                     email: infodesk@nag.com
 
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
4-9-9
Hatchobori
Chuo-ku
Tokyo
104-0032
Japan
email: help@nag-j.co.jp

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