Optimization Settings

Applying a LP-optimization model in forest management planning, integer solutions are sometimes of interest. A stand is usually regarded as a treatment unit to be completely treated according to a certain treatment in a certain period. This might be of certain interest when it comes to short term-planning, i.e. what to do now and in the next year - couple of years.

The most straightforward way to obtain integer solutions is to allow only integer values of the decision variable, i.e. set the range type of x_{i, j} to "binary". In menu "Optimization" > "Settings...":

1. The General-tab allows the user to... By selecting "Integer-round off"... Optimization results can be saved to the result database by selection or by pressing the "Discette"-button in the optimization model builder-window.
2. The Lpsolve Settings-tab allows the user to... In "Mip Gap" ..., in "Time Limit"...
3. The Cplex Settings-tab...

• Note

Values, in SEK/ha, can obviously be less than zero (negative) for stands and analysis areas in one or several periods. Make sure that this variable has a "RangeType" set to "All" (and not "Default" that only allows for positive values).