Undefined function 'isPropertyPortTarget' for input arguments of type 'meta.property'.

Hi all,

I have been trying to find a solution for it in the forum and documentation, but haven't turned up with a solution or reference to this error.

What am I trying to do?

I am trying to create a matlab.System object named SingleAgent ( SingleAgent.m )with the following code

classdef SingleAgent < matlab.System & AgentPlant
    properties
        prop_1
    end

    methods(Access = protected)
        function setupImpl(obj)
            % Perform one-time calculations, such as computing constants
            AgentPlant()
            obj.prop_1 = 1;
        end
        
        function y = stepImpl(obj,u)
            % Implement algorithm. Calculate y as a function of input u and
            % discrete states.
            y = u;
        end

        function resetImpl(obj)
            % Initialize / reset discrete-state properties
        end
    end
end

As seen above, I am trying to inherit a handle object named AgentPlant which I am instantiating within the stepImpl() of the SingleAgent.

The definition of the AgentPlant - handle object (in AgentPlant.m) is as follows:

classdef AgentPlant < handle
    properties
        action_matrix
        operation_time
        current_activity
    end
    
    properties(Constant)
        EMPTY = -9999
        act_queue_size = 10;
    end
    
    methods
        function obj = AgentPlant()
            obj.operation_time = 0;
        end
        
    end
end

I am trying to add the matlab.System object within Simulink (I am attaching the Simulink file which does this, if it helps). However, I am not able to do it and I get the error as defined in the summary. I am also attaching the screen-shot and files associated with this error I am facing.

Please let me know if anyone in the community has faced this error before, and if so how did you manage to resolve it?

Looking forward to your comments. Thank you!

Answer 1

[Murali]

I played around with the Access properties of the attributes of the handle object and figured that it only works if the attributes without an initial value needs to have Access = protected.

Is there any documentation out there which specifies what these quirks are about these MATLAB?