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COPYRIGHT
The LINGO software and it’s related documentation are copyrighted. You may not copy the LINGO
software or related documentation except in the manner authorized in the related documentation or
with the written permission of LINDO Systems Inc.

TRADEMARKS
LINGO is a trademark, and LINDO is a registered trademark, of LINDO Systems Inc. Other product
and company names mentionedherein are the property of their respective owners.

DISCLAIMER
LINDO Systems, Inc. warrants that on the date of receipt of your payment, the disk enclosed in the
disk envelope contains an accurate reproduction of the LINGO software and that the copy of the
related documentation is accurately reproduced. Due to the inherent complexity of computer programs
and computer models, the LINGOsoftware may not be completely free of errors. You are advised to
verify your answers before basing decisions on them. NEITHER LINDO SYSTEMS, INC. NOR
ANYONE ELSE ASSOCIATED IN THE CREATION, PRODUCTION, OR DISTRIBUTION OF
THE LINGO SOFTWARE MAKES ANY OTHER EXPRESSED WARRANTIES REGARDING
THE DISKS OR DOCUMENTATION AND MAKES NO WARRANTIES AT ALL, EITHER
EXPRESSED OR IMPLIED, REGARDING THE LINGOSOFTWARE, INCLUDING THE
IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE,
OR OTHERWISE. Further, LINDO Systems, Inc. reserves the right to revise this software and related
documentation and make changes to the content hereof without obligation to notify any person of such
revisions or changes.
Copyright © 2004 by LINDO Systems Inc. All rights reserved.
Published by1415 North Dayton Street
Chicago, Illinois 60622
Technical Support: (312) 988-9421
E-mail: tech@lindo.com
WWW: http://www.lindo.com

Contents
Contents.................................................................................................................................................... iiiPreface...................................................................................................................................................... vii
1 Getting Started with LINGO ............................................................................................................... 1
What is LINGO?................................................................................................................................... 1
InstallingLINGO................................................................................................................................... 1
Entering a Model in Windows .............................................................................................................. 3
Modeling from the Command-line..................................................................................................... 15
Examining the Solution...................................................................................................................... 17
Using the Modeling Language........................................................................................................... 18
Additional Modeling LanguageFeatures........................................................................................... 28
Maximum Problem Dimensions......................................................................................................... 33
How to Contact LINDO Systems ....................................................................................................... 33
2 UsingSets.......................................................................................................................................... 33
Why Use Sets? .................................................................................................................................. 33
What Are Sets?.................................................................................................................................. 33
The Sets Section of a Model...