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Control Variant Choices in Masked Variant Assembly Subsystem Block Using Mask Parameter Object

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This example shows how to specify variant choices and set an active choice in a masked Variant Assembly Subsystem block using a mask parameter object.

Explore Model

Open the model slexVariantAssemblySubsystemWithMask, which contains a masked Variant Assembly Subsystem block, Controller.

open_system('slexVariantAssemblySubsystemWithMask')

Define Classes for Reference Models

In this example, the vas_controller class is a superclass that includes a property and two methods. The getVariantChoices method returns a cell array of variant choices to be added to the Variant Assembly Subsystem block. From the list of choices, the setActiveVariant method sets the choice, specified as subsystemFile, to be active.

type vas_controller.m

classdef (Abstract) vas_controller
    properties
        subsystemFile char
    end
    methods (Static)
        function list = getVariantChoices()
            list = {'linearController','nonlinearController'};
        end
    end

    methods
        function setActiveVariant(obj,blk)
            set_param(blk,'LabelModeActiveChoice',obj.subsystemFile)
        end
    end
end

The two classes vas_linearController and vas_nonlinearController inherit from the vas_controller superclass. The vas_linearController class stores the name of the active choice as linearController in the inherited property subsystemFile. The class also stores numerator and denominator values used in the Discrete Transfer Fcn block of the linearController model.

type vas_linearController.m

classdef vas_linearController < vas_controller
    properties
        numerator
        denominator
    end

    methods
        function obj = vas_linearController()
            obj.numerator = [1 .7];
            obj.denominator = [1 .09 0.5];
            obj.subsystemFile = 'linearController';
        end
    end
end

Similarly, the vas_nonlinearController class stores the name of the active choice as nonlinearController in subsystemFile. The class also stores breakpoint and table values used in the 1-D Lookup Table of the nonLinearController model.

type vas_nonlinearController.m

classdef vas_nonlinearController < vas_controller
    properties
        breakpoints
        table
    end

    methods
        function obj = vas_nonlinearController()
            obj.breakpoints = -5:5;
            obj.table = tanh(-5:5);
            obj.subsystemFile = 'nonlinearController';
        end
    end
end

Set Parameter Object Value in Parent Model

Double-click the Controller block to open the mask dialog box.

The value that you specify for vssObj in the mask dialog box is mapped to the mask parameter object obj.

Using obj, you can instantiate the class vas_linearController or vas_nonlinearController. You can then call its methods, getVariantChoices and setActiveVariant.

For example, to specify the variant choices of the Controller block, the Variant choices specifier parameter in the Reference tab of the Block Parameters dialog box is set to obj.getVariantChoices().

To set an active choice in the Variant Assembly Subsystem block, the obj.setActiveVariant() method is used in its mask initialization code.

Set Active Choice by Instantiating Classes Using Mask Parameter Object

Case 1: linearController Is Active and nonlinearController Is Inactive

When you specify vssObj as vas_linearController, the value vas_linearController is mapped to the mask parameter object obj. The Variant choices specifier parameter value obj.getVariantChoices() evaluates to a cell array that contains the filenames linearController and nonlinearController to be added as variant choices to the Controller block. obj.setActiveVariant(gcb) in the mask initialization code sets the linearController subsystem to be active.

vssObj = vas_linearController;
out = sim('slexVariantAssemblySubsystemWithMask');
plot(out.tout, out.yout);
xlabel('Time (seconds)')
ylabel('data')

Case 2: linearController Is Inactive and nonlinearController Is Active

When you specify vssObj as vas_nonlinearController, the value vas_nonlinearController is mapped to the mask parameter object obj. The Variant choices specifier parameter value obj.getVariantChoices() evaluates to a cell array that contains the filenames linearController and nonlinearController to be added as variant choices to the Controller block. obj.setActiveVariant(gcb) in the mask initialization code sets the nonlinearController subsystem to be active.

vssObj = vas_nonlinearController;
out = sim('slexVariantAssemblySubsystemWithMask');
plot(out.tout, out.yout);
xlabel('Time (seconds)')
ylabel('data')

See Also

Add or Remove Variant Choices of Variant Assembly Subsystem Blocks Using External Files