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PC World Komputer 1999 January
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pcwk_01_1999_B.iso
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Lotus123
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ENGLISH
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123
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SOLVER
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SOLVE123.EXE
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Readme.txt
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1997-01-31
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SOLVER FOR LOTUS 1-2-3 97 EDITION, FROM FRONTLINE SYSTEMS INC.
-------------------------------------------------------------
You can use the file SOLVE123.EXE in this directory to install a
limited-use trial version of a new Solver add-in for Lotus 1-2-3
97 Edition. This add-in, which replaces the Solver in previous
versions of 1-2-3, is a what-if analysis tool that you can use to
find answers to problems that you define, using constraint
formulas and an objective formula to be maximized or minimized.
The Solver add-in was developed and is supported by Frontline
Systems Inc.
This README file covers the following topics:
1. Installing the Solver
2. Getting Help
3. What is the Solver Good For?
4. Upgrading from the Solver in 1-2-3 Release 5
INSTALLING THE SOLVER
---------------------
To install the new Solver, simply run the program SOLVE123.EXE on
the computer where you have installed 1-2-3 97 Edition. You can
double-click the filename SOLVE123.EXE in Windows Explorer, or
select Run from the Start menu and type or browse to the path of
SOLVE123.EXE.
You don't have to specify anything further: Just click the Setup
button, then the OK button when prompted. SOLVE123.EXE is a
"self-extracting archive" which creates a Solver subdirectory
within your 1-2-3 directory (for example, c:\lotus\123\solver)
and copies the necessary files into this subdirectory. It then
registers the Solver add-in (filename SOLVER.12A) to auto-load
whenever you start 1-2-3.
To use the Solver add-in from 1-2-3 97 Edition, select Range,
Analyze, Solver to display the main Solver Parameters dialog.
Click the Help button on this dialog to access extensive how-to
information about the Solver (see "Getting Help" below).
After you install the Solver, you'll also see a sample workbook
SOLVSAMP.123 in your Recently Used Files List when you start
1-2-3: You can open this workbook, solve the problems on any of
the six predefined application worksheets (sheets B through G),
and practice setting up a Solver problem on worksheet A.
If you have problems with registration or auto-loading of the
Solver after the installation, double-click on the filename
SOLVER.HLP in the Solver subdirectory, and consult the section
"Custom Installation". If you were unable to run SOLVE123.EXE,
you can extract the Help file SOLVER.HLP from the archive file
SOLVE123.EXE using a program such as WinZip or PKZIP.
To deactivate the Solver, select File, Add-Ins, Manage Add-Ins,
then click on the check mark next to the filename SOLVER.12A so
that the check mark disappears. Then click Done. To remove the
Solver add-in completely from your system, use the Manage Add-Ins
dialog Remove button to remove the filename SOLVER.12A, then
delete the Solver subdirectory and all the files it contains.
GETTING HELP
------------
Frontline Systems offers telephone technical support for the
Solver on a fee basis, and also maintains an extensive World Wide
Web support site which you can access free of charge. Lotus
Customer Support also offers some information about the Solver,
though not in the same depth as the Solver developers, Frontline
Systems. Most questions can be answered from the Solver's online
Help, or by consulting Frontline's Web site. We encourage you to
use the free resources first!
To learn about Solver licensing and telephone technical support,
click on the Help button in the Solver Parameters, Solver Options
or Solver Results dialog. You will see a dialog box which
reports the status of your Solver license: If you are using the
trial version, this dialog shows how many problem solution
attempts (clicks of the Solve button) remain before the trial
license expires. If you have purchased a permanent license, it
shows your user name and registration serial number. To purchase
a permanent license, click the Register button. Also included in
this dialog is telephone support and Web site information. Click
the Help button in this dialog to reach the Solver Help file.
If you have access to the World Wide Web via the Internet, you
will find a wealth of current information about the Solver --
over 70 pages at this writing -- at Frontline Systems' Web site,
http://www.frontsys.com
Since this site is frequently updated, it is well worth while to
check it periodically for the latest news about the standard and
enhanced Solvers. If you can't find the answer you need, you can
send email to Frontline Systems directly from your Web browser
with a single mouse click. Or, if you're using a separate email
system, send it to:
info@frontsys.com
To reach Frontline Systems by phone, fax, or mail, please use:
Frontline Systems, Inc.
P.O. Box 4288
Incline Village, NV 89450, USA
Tel (702) 831-0300
Fax (702) 831-0314
WHAT IS THE SOLVER GOOD FOR?
----------------------------
The Solver is especially useful for resource allocation problems.
The resources may be raw materials, people or equipment time,
money, or anything else in limited supply. The decision
variables represent the amounts of resources, and the constraints
quantify the limits on their use. The Solver finds the
allocation of resources that will maximize profit or minimize
cost, while satisfying the constraints.
The workbook SOLVSAMP.123, which is installed with the Solver
when you run SOLVE123.EXE, shows you how to:
* Assemble products from parts in inventory so as to maximize
profits
* Ship goods from plants to regional warehouses at minimum cost
* Schedule employees to meet demand at an amusement park while
minimizing cost
* Invest cash monthly in short-term certificates of deposit to
maximize interest income
* Allocate funds to stocks in a portfolio to maximize return for
a given level of risk
The Solver uses the methods of linear programming, nonlinear
programming, and integer programming to find optimal solutions.
You'll find more information on these topics in the Solver Help
system, accessed by clicking the Help button in any of the Solver
dialogs.
UPGRADING FROM THE SOLVER IN 1-2-3 RELEASE 5
--------------------------------------------
Capabilities: The new Solver provides linear and nonlinear
optimization capabilities similar to those of the Solver in 1-2-3
Release 5. It also handles problems with integer constraints,
which allow users to include features such as fixed costs and
yes/no decisions (such as whether to build a new plant) in their
models.
Problem Size: Unlike the 1-2-3 Release 5 Solver, which had no
fixed limits on problem size, the new Solver has a fixed upper
limit of 200 decision variables, and 100 constraints for
nonlinear problems. But you will be able to solve problems on
most modern PCs all the way up to this limit, which in practice
is substantially larger than the 1-2-3 Release 5 Solver could
handle in the same amount of memory and allowed solution time.
If you need to solve larger problems, contact Frontline Systems
about enhanced versions of the Solver with more capacity and
speed.
Converting Models: Solver models created in 1-2-3 Release 5 may
be easily converted into the form required by the new Solver.
Just follow these steps: Open your 1-2-3 Release 5 worksheet
containing a Solver problem. Select Range, Analyze, Solver to
display the Solver Parameters dialog. Type or select the
objective (cell to be maximized or minimized) and the range of
adjustable, or variable cells. Then click the Add button to add
constraints. In the Cell Reference edit box, select the range of
constraint formula cells in your 1-2-3 Release 5 model, then
click OK without selecting anything else. The new Solver will
separate your constraint formulas into their "left hand sides",
relations (<=, =, >=) and "right hand sides" automatically.
NOTE: This can only be done once, since your constraint formulas
are modified in the process!
Converting Macros: If you have written 1-2-3 macros employing
commands such as {SOLVER-DEFINE} to control the 1-2-3 Release 5
Solver, you'll find that the new Solver supports the same
commands, with a few changes in the arguments. The new Solver
also sports a complete programmable interface for LotusScript,
which will be the preferred approach for implementing new
applications. NOTE: The macro commands are best used as a
transition aid -- you are strongly encouraged to convert your
applications to LotusScript!