Quick start - Gams

Model statistics
GAMS also creates an output summarizing the size of the model as appears just below from the
non-linear equation solving example nonlinsys.gms. This gives how many variables of equations
and nonlinear terms are in the model along with some additional information. For discussion of
the other parts of this output see the Standard Output and NLP and MCP model types chapters.
MODEL STATISTICS
BLOCKS OF EQUATIONS 6 SINGLE EQUATIONS 6
BLOCKS OF VARIABLES 6 SINGLE VARIABLES 6
NON ZERO ELEMENTS 20 NON LINEAR N-Z 10
DERIVATIVE POOL 6 CONSTANT POOL 8
CODE LENGTH 89
Solver report
The final major component of the LST file is the solution output and consists of a summary and
then a report of the solutions for variables and equations. Execution error reports may also
appear in nonlinear models as discussed in the Execution Errors Chapter.
Solution summary
The solution summary contains
the marker S O L V E S U M M A R Y;
the model name, objective variable name (if present), optimization type (if present), and
location of the solve (in the echo print);
the solver name;
the solve status in terms of solver termination condition;
the objective value (if present);
some cpu time expended reports;
a count of solver execution errors; and
some solver specific output.
The report from the non-linear equation solving example nonlinsys.gms appears just below.
S O L V E S U M M A R Y
MODEL wall OBJECTIVE ba
TYPE NLP DIRECTION MINIMIZE
SOLVER CONOPT FROM LINE 28
**** SOLVER STATUS 1 NORMAL COMPLETION
**** MODEL STATUS 2 LOCALLY OPTIMAL
**** OBJECTIVE VALUE 1.0000
Courtesy of B.A. McCarl, October 2002 20