The syntax of the simple GAMS call is extended as follows: > gams myfile key1=value1 key2=value2. GAMS permits certain options to be passed through the command line. Specifying Options Through the Command Line We will discuss these topics in the next four subsections. As command line parameters may be specified in several different ways, there are rules of precedence in case of conflicting instructions. In addition, command line parameters may be set by specifying a secondary customization parameter file and by modifying the GAMS system parameter file. Observe that some GAMS options may be specified on the command line as part of the GAMS call. compression the source file trnsport.gms.retrieval of the model from the GAMS Model Library.Note GAMS can also run source files that have been compressed with Posix utility gzip or have been encrypted with tool ENDECRYPT, for example > gamslib trnsport Optimal objective 153.675 - 4 iterations time 0.052
#EVOSCAN 2.9 MAP TRACER NO VALUES SHOWN WINDOWS#
Starting execution: elapsed 0:00:00.010ĬOIN-OR CBC 24.8.4 r60966 Released WEI x86 64bit/MS Windows Licensee: GAMS Development Corporation, Washington, DC G871201/0000CA-ANY For example, the following statements retrieves and runs the model from the GAMS model library with the responds from the GAMS system: > gamslib trnsport During the run GAMS will print a log to the console and create a listing file that is written by default to the file myfile.lst. If a file with this name cannot be found, GAMS will look for a file with the extended name myfile.gms. GAMS will compile and execute the GAMS statements in the file myfile. The simplest way to start GAMS from a command shell is to enter the following command from the system prompt: > gams myfile A GAMS run usually consists of two phases: the compilation and execution phase. In almost all cases such a run continues from start to end without any user interaction. options available via command line parameters, option statement, and model attribute. Moreover, most of the chapter is dedicated to the detailed description of all GAMS options (i.e. In addition, we will discuss user-defined command line parameters, compile-time variables and compile-time constants, which are GAMS specialties, and environment variables in GAMS. In this chapter we will introduce how GAMS is called from the command line and how parameters may be specified on the command line or in other ways. Although details will vary with the type of computer and operating system used, the general operating principles are the same on all machines. In order to avoid confusion with the often used word option we refer to theses entities as command line parameters and demonstrate its with the gams executable from the command line. For example, in Studio via the parameter editor in the toolbar, in the object oriented API through the GAMSOptions class, and from the command line via command line arguments. Depending on the particular way GAMS is triggered these options are supplied in different ways. Several options are available to customize the GAMS run. In all cases the same GAMS engine runs the user's model. There are multiple ways to trigger the run of a GAMS model: Running a model via F9 from GAMS Studio, executing GAMSJob.Run method in the object oriented APIs or calling the gams executable from a command line.
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