==Defining the HDMR Variables ==
[[Image:Variable32.png|thumb|500px|The HDMR Settings dialog.]]
Note that you can change your mind and remove an HDMR variable from the list. To do so, select its name or row from the list and use the {{key|Left Arrow (<--)}} button to move it back to the Independent Variables Table. You can also change the attribute values of an HDMR variable after it has been defined. Select the variable from the list and click the {{key|Edit}} button of the dialog.
==Defining the HDMR Functions Models ==
To define an HDMR model, follow the procedure below:
To define a design objective, follow the procedure below:Â * Open the '''Objectives Dialog''' either by clicking the '''Objectives''' [[File:objective_icon.png]] button of the '''Simulate Toolbar''', or by selecting '''Menu > Simulate > Objectives...''' from the Menu Bar, or using the keyboard shortcut {{key|Ctrl+J}}. The objectives dialog is initially empty. * To add a new objective, click the '''Add''' button in the "HDMR Models" section of the dialog to open up the '''Add Objective HDMR Model Dialog'''. At the bottom of this dialog, you can see a list of all the available [[EM.Cube]] standard output [[parameters]]. This list may vary depending on the types of sources and observables you have defined in your project. * Type in any mathematical expressions in the boxes labeled '''Expression 1''' and '''Expression 2'''. If you select the name of any standard parameter in the table and double-click on it, it will be reflected in the expression box.
* Select one of the available options in the dropdown list labeled '''Logical Operator'''. The default operator is '''"== (Equal To)"'''.
* Once the construction of your objective is complete, click the '''OK''' button on the dialog to close it and return to the Objectives dialog.