CPLEX produced a lower bound at Docked — the drawing board window is docked by default. This solution appears in the Solutions notebook page. In Microsoft Windows, you must drag and drop the title bar see Figure 1. Click on the Continue Run button and observe the yellow arrow exploring the tree in a Depth First Search strategy. Low values of this backtracking parameter thus tend to increase the amount of backtracking, which makes the search process more of a pure best-bound search. You can see that slot 1 has car 5, slot 2 has car 4, and so on. 
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A red dot appears in the margin. To end the 8 Queens example, click on Abort.
Setting the value to 0, the default, indicates that the attempt to generate GUB cuts should continue only if it seems to be helping. To access the help, kpl must use Microsoft Internet Explorer 4. These white nodes are left unvisited for the moment. All errors appear in the Console notebook page of the output area in the lower half of the Main window.
The n-ary tree corresponding to your search is displayed. For Oracle, for example, the format is: Variables with higher priorities will be branched on before variables with lower priorities when the variables have fractional values.
ILOG OPL Studio Studio User`s Manual |
When backtracking occurs, the square is cleared. You can stop this effect in the Advanced page of the Default Options dialog box. To understand more clearly what is displayed in the Stack and Inspector windows during a search, we will examine the corresponding search tree. If you look at the Optimization notebook page, you see that it is empty. Settings 1 and 2 differ only during Phase I.
The root of the tree appears.
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Model This page displays the model browser, containing information about the data structures verxion in the active model.
The best bound choice emphasizes moving the best bound frree an aggressive technique for proving optimality on extremely difficult models. The destination directory is the directory in which the project file is located, or the model file is located.
The most recently opened project model is by default the active project. To understand what happens at each choice point, take a look at the Drawing Board. The available methods are: Rightclick on the queens item in the Model notebook page and select "display domain". Click on the Activities tab to bring the Activities notebook page to the foreground.
IBM ILOG CPLEX Optimization Studio
You can change the colors of the time windows in the Advanced notebook page of the Options dialog box. Search Tree Mode Selectors Selection mode Click on the arrow button, then double-click on a node belonging to the current branch. The number between brackets indicates the depth in the search tree. The opened files are displayed in separate panels with the file name appearing in the title bar.
You will see the result of the choice and of the constraint propagation on the chessboard. The yellow arrow indicates the current node.
You will see OPL finding solutions and backtracking. For example, click on the Rebuild Vversion Information button Main window. To find out which project is the active one, look at the Projects notebook page; the active project is colored red. CPLEX does not backtrack until the absolute value of the difference between the current objective and the best node is at least as large as the target gap. Defines an absolute tolerance on the gap between the best integer objective and the objective of the best node remaining.
Working with Projects Code Sample 2. Used on a maximization problem to cut off any nodes that have an objective value below this value.
