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8 CHAPTER 1 The solver status window is useful for monitoring the progress of the solver and the dimensions of your model. The various fields are described in more detail below. The solver status window also provides you with an Interrupt Solver button. Interrupting the solver causes LINGO to halt the solver on the next iteration. In most cases, LINGO will be able to restore and report the best solution found so far. The one exception is in the case of linear programming models (i.e., linear models without integer variables). If a linear programming model is interrupted, the solution returned will be meaningless and should be ignored. This should not be a problem because linear programs generally solve quickly, thus minimizing the need to interrupt. Note: You must be careful how you interpret solutions after interrupting the solver. These solutions 1) will definitely not be optimal, 2) may not be feasible to all the constraints, and 3) are worthless if the model is a linear program. Next to the Interrupt Solver button is another button labeled Close. Hitting the Close button will close the solver status window. This window can be reopened at any time by selecting the Window|Status Window command.
