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Use a program like md5sum to verify. This should come preinstalled on most Linux systems. On Windows systems, open a powershell and enter Get-FileHash .\windows_x64_64.exe -Algorithm MD5. On macOS systems, you can use md5 in the terminal.
The relational operators have the following meanings:
=l= less than or equal to
=g= greater than or equal to
=e= equal to
7 Objective Function 17
• It is important to understand the difference between the symbols '=' and '=e='. The '=' symbol is used only in direct
assignments, and the '=e=' symbol is used only in equation definitions. These two contexts are very different. A direct
assignment gives a desired value to a parameter before the solver is called. An equation definition also describes a
desired relationship, but it cannot be satisfied until after the solver is called. It follows that equation definitions must
contain variables and direct assignments must not.
• Variables can appear on the left or right-hand side of an equation or both. The same variable can appear in an equation
more than once. The GAMS processor will automatically convert the equation to its equivalent standard form (variables
on the left, no duplicate appearances) before calling the solver.
• An equation definition can appear anywhere in the GAMS input, provided the equation and all variables and parameters
to which it refers are previously declared. (Note that it is permissible for a parameter appearing in the equation to be
assigned or reassigned a value after the definition. This is useful when doing multiple model runs with one GAMS
input.) The equations need not be defined in the same order in which they are declared.
GAMS lets you place explanatory text (shown in lower case) throughout your model, as you develop it. Your comments are automatically incorporated into the output report, at the appropriate places.
Structure of a GAMS Model
For the remainder of the tutorial, we will discuss the basic components of a GAMS model, with reference to the example
above. The basic components are listed in table Table 2.
Table 2: The basic components of a GAMS model
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