Using Simulink

Control Types

Simulink enables you to choose how parameter values are entered or selected. You can create three styles of controls: edit fields, check boxes, and pop-up controls. For example, this figure shows the parameter area of a mask dialog box that uses all three styles of controls (with the pop-up control open).

Edit Control

An edit field enables the user to enter a parameter value by typing it into a field. This figure shows how the prompt for the sample edit control was defined.

The value of the variable associated with the parameter is determined by the Evaluate option.

Evaluate	Value
On	The result of evaluating the expression entered in the field
Off	The actual string entered in the field

Check Box Control

A check box enables the user to choose between two alternatives by selecting or deselecting a check box. This figure shows how the sample check box control is defined.

The value of the variable associated with the parameter depends on whether the Evaluate option is selected.

Control State	Evaluated Value	Literal Value
Checked	1	'on'
Unchecked	0	'off'

Pop-Up Control

A pop-up enables the user to choose a parameter value from a list of possible values. Specify the values in the Popups field on the Parameters pane (see Popups). The following example shows a pop-up parameter.

The value of the variable associated with the parameter (Color) depends on the item selected from the pop-up list and whether the Evaluate option is checked (on).

Evaluate	Value
On	The index of the value selected from the list, starting with 1. For example, if the third item is selected, the parameter value is 3.
Off	A string that is the value selected. If the third item is selected, the parameter value is 'green'.

Changing Default Values for Mask Parameters in a Library

To change default parameter values in a masked library block, follow these steps:

1. Unlock the library.
2. Open the block to access its dialog box, fill in the desired default values, and close the dialog box.
3. Save the library.

When the block is copied into a model and opened, the default values appear on the block's dialog box.

For more information, see Working with Block Libraries.

The Parameters Pane

The Initialization Pane