Use the MODEL command to begin inputting a new model into LINGO.  LINGO prompts for each new line of the model with a question mark. When you are through entering the model, enter END on a single line by itself. LINGO will then return to normal command mode (indicated by the colon prompt).

In the following example, we enter a small model with the MODEL command, display it with the LOOK command, and then solve it with the GO command:

: MODEL

? !How many years does it take

? to double an investment growing

? 10% per year?;

? 1.1 ^ YEARS = 2;

? END

: LOOK ALL

 

  1]!How many years does it take

  2]to double an investment growing

  3]10% per year?;

  4]1.1 ^ YEARS = 2;

 

: GO

 

Feasible solution found at step:    0

 

             Variable           Value

                YEARS        7.272541

 

                  Row    Slack or Surplus

                    1            0.000000

 

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