Fixing, Deleting, and Sorting Design Points

You can fix or delete points using the Edit menu. You can also sort points or clear all points from the design.

Fixed points become red in the main Design Editor table display. If you have matched data to a design or used experimental data as design points, those points are automatically fixed. You already have the data points, so you do not want them to be changed or deleted. Design points that have been matched to collected data are also fixed. Since these points have already been run they cannot be freed — you will not see them in the Fix Design Points dialog box. Once you have fixed points, they are not moved by design optimization processes. This automatic fixing makes it easy for you to optimally augment the fixed design points.

To fix or delete points:

1. To delete all points in the current design, select Edit > Clear.

2. If you want to fix or delete particular points, first change a Design Editor display pane to the Table view. This gives a numbered list of every point in the design, so you can see where points are in the design.

3. Select Edit > Fix/Free Points or Edit > Delete Point (or click the toolbar button ).

4. A dialog box appears in which you can choose the points to fix or delete.

   

   The example above shows the dialog box for fixing or freeing points. The dialog box for deleting points has the same controls for moving points between the Keep Points list and the Delete Points list.

5. Move points from the Free Points list to the Fixed Points list; or from the Keep Points list to the Delete Points list, by using the buttons.

6. Click OK to complete the changes specified in the list boxes, or click Cancel to return to the unchanged design.

To sort points:

1. Select Edit > Sort. A dialog box appears (see example following) for sorting the current design — by ascending or descending factor values, randomly, or by a custom expression.

   

2. To sort by custom expression you can use MATLAB expressions (such as abs(N) for the absolute value of N) using the input symbols. Note that sorts are made using coded units (from -1 to 1) so remember that points in the center of your design space will be near zero in coded units, and those near the edge will tend to 1 or -1.

3. Select Edit > Randomize as a quick way of randomly resorting the points in the current design. This is a shortcut to the same functionality provided by the Random option in the Sort dialog box.

Merging Designs

Exporting and Importing Designs

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