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Introduction
The
General Algebraic Modeling System (GAMS) is specifically
designed for modeling linear, nonlinear and mixed integer
optimization problems. The system is especially useful
with large, complex problems. GAMS is available for use on
personal computers, workstations, mainframes and
supercomputers.
GAMS
allows the user to concentrate on the modeling problem by
making the setup simple. The system takes care of the
timeconsuming details of the specific machine and system
software implementation.
GAMS is
especially useful for handling large, complex,
oneofakind problems which may require many revisions to
establish an accurate model. The system models problems in
a highly compact and natural way. The user can change the
formulation quickly and easily, can change from one solver
to another, and can even convert from linear to nonlinear
with little trouble.
System Features
GAMS
lets the user concentrate on modeling. By eliminating the
need to think about purely technical machinespecific
problems such as address calculations, storage
assignments, subroutine linkage, and inputoutput and flow
control, GAMS increases the time available for
conceptualizing and running the model, and analyzing the
results. GAMS structures good modeling habits itself by
requiring concise and exact specification of entities and
relationships. The GAMS language is formally similar to
commonly used programming languages. It is therefore
familiar to anyone with programming experience.
Using
GAMS, data are entered only once in familiar list and
table form. Models are described in concise algebraic
statements which are easy for both humans and machines to
read. Whole sets of closely related constraints are
entered in one statement. GAMS automatically generates
each constraint equation, and lets the user make
exceptions in cases where generality is not desired.
Statements in models can be reused without having to
change the algebra when other instances of the same or
related problems arise. The location and type of errors
are pinpointed before a solution is attempted. GAMS
handles dynamic models involving time sequences, lags and
leads and treatment of temporal endpoints.
GAMS is
flexible and powerful. Models are fully portable from one
computer platform to another when GAMS is loaded to each
platform. GAMS facilitates sensitivity analysis. The user
can easily program a model to solve for different values
of an element and then generate an output report listing
the solution characteristics for each case. Models can be
developed and documented simultaneously because GAMS
allows the user to include explanatory text as part of the
definition of any symbol or equation.
GPS 
Timing 
MIL qualified GPS 
Handheld Receivers 
Lonospheric Research 
Vehicle Tracking 
Survey 
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