Model Browser User's Guide

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. Once fixed, they are not moved by design optimization processes. This automatic fixing makes it easy for you to optimally augment the fixed design points.

1. Select Edit -> Fix/Free Points or Edit -> Delete Point (there is also a toolbar button  )

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

   

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

2. In order to see where these points are in the design, you must change the main Design Editor display pane to the Table view. This gives a numbered list of every point in the design.
3. 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.
4. Click OK to complete the changes specified in the list boxes, or click Cancel to return to the unchanged design.

Design points that are matched to experimental data are set to fixed points so you can redesign unmatched points easily.

• Selecting Edit -> Clear deletes all points in the current design.
• Edit -> Sort opens a dialog (see example following) for sorting the current design -- by ascending or descending factor values, randomly, or by a custom expression.

  

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 centre of your design space will be near zero in coded units, and those near the edge will tend to 1 or -1.

Adding Design Points

Saving and Importing Designs