Action Node

Process object tokens through MATLAB function or nested activity diagram

Since R2024a

expand all in page
  • Action Node

Description

An action node represents a specific action to execute within an activity diagram. This action is realized either through a MATLAB® function or a nested activity diagram.

Action nodes process incoming tokens to produce new tokens. Input pins consume input tokens. Newly generated tokens exit through the output pins.

For action node to execute, their input pins must hold the minimum number of object tokens specified by the token multiplicity parameter, and all incoming control flows must offer a control token.

Action nodes with MATLAB behavior terminate when the MATLAB function completes. However, action nodes with activity behavior terminate when all the output parameter nodes, flow final nodes and activity final nodes have at least one token each.

For a roadmap of the activity diagram topics, see Describe System Behavior Using Activity Diagrams.

Create an Action Node

You can create an action node on the activity diagram canvas in two ways:

  • Drag the Action Node block from the palette on the left to any location on the canvas.

  • Hold the left pointer at the desired location on the canvas and drag in any direction. A blue outline of a node appears on the canvas. From the menu that appears below the outline, select Create Action.

Parameters

expand all

Action Node

Name of the action node. By default, the activity diagram editor names the first action node placed on the canvas as Action. As you add more action nodes, the editor attaches increasing numerical suffixes to the name Action.

Example: Action2

Indicate the type of activity that the action node represents.

  • MATLAB — Contains an existing MATLAB function such as rand, or a custom function written in an .m file

  • Activity — Contains another activity diagram that consumes and produces tokens

When you select this check box, the names of all input and output pins to the selected action node are displayed.

Name of the MATLAB function that an action node implements. The function can either be an existing MATLAB function, or a custom function that you have authored in an .m file.

Example: customfunction_add

Dependencies

To enable this parameter, set Behavior Type to MATLAB in the Property Inspector.

The number of time units an activity diagram spends on the execution of an action node. An activity diagram executes MATLAB functions of an action node at the end of the duration period.

This list contains stereotypes from imported profiles. To assign a stereotype to an action node, select the stereotype from the list.

You can also use <new/edit> option to manage profiles using Profile Editor.

Version History

Introduced in R2024a

See Also

Functions

Tools

Blocks

Topics