The design region can be defined using the Disallowed Combinations option from the Space Filling Design red triangle menu or by selecting Add linear constraints under Fast Flexible Filling in the list of Space Filling Design Methods. However, the design is generated differently for these two methods.
When linear constraints are specified using the Add linear constraints option, the random points that form the basis for the clustering algorithm are uniformly-distributed within the constrained design region. The clustering algorithm uses these points.
1.
Select DOE > Space Filling Design.
4.
Click Continue.
6.
Specify linear constraints. Click the Linear Constraint button and add linear constraints. (For details on adding constraints, see Defining Factor Constraints, If Necessary.)
7.
Click the Fast Flexible Filling button.
8.
Click Make Table in the Design Table panel to construct the data table.
Design Specification for Fast Flexible Filling Design with One Constraint shows the design specification dialog for a two-factor design with one linear constraint, . The Number of Runs is set at 200.
Design Specification for Fast Flexible Filling Design with One Constraint
1.
Select DOE > Space Filling Design.
2.
For the two default factors, X1 and X2, alter the factor values to 0 and 1.
3.
Click Continue.
5.
Click the Linear Constraint button.
7.
Click the Fast Flexible Filling button.
1.
2.
Drag X1 to the drop zone labeled X.
3.
Drag X2 to the drop zone labeled Y.
4.
Remove the Smoother by clicking the smoother icon (the second icon from the left in the row of icons directly above the graph).
5.
In the Graph Builder red triangle menu, click Show Control Panel to deselect it.
You should see a graph similar to the one in Fast Flexible Filling Design with One Linear Constraint. Note that the points satisfy the linear constraint . Also, consider the distance between any point in the design space and its closest design point. Note that there is not much variation in these distances.
Fast Flexible Filling Design with One Linear Constraint