从超类继承时实现 matlab.system 进行故障排除



我正在尝试将 matlab 类实现到 simulink MATLABSystem 中。当我实现超类时,模拟工作正常,但是使用子类时,我收到以下错误:

"Simulink 无法自动推断'子类系统'的输出信号属性。Simulink 使用代码生成技术自动确定系统对象的输出信号属性。 系统对象"子类"包含不支持代码生成的代码。 错误是 '未定义的函数或变量'obj'。对局部变量的第一个赋值决定了它的类。 MATLAB 系统块"子类系统"发生错误。请参阅文件 'superclass.m' 中的第 29 行,第 28 列。在大小传播阶段检测到错误。

我在下面的代码中注释了这一行

我必须指定其他内容吗?

这里是子类定义:

classdef subclass < superclass
    properties(Access = protected) % These variables must be initialised. Here or in the setupImpl function
    end
    methods (Access=protected)
        function resetImpl(obj)
        end
        %% Common functions
        function setupImpl(obj)
            % Perform one-time calculations, such as computing constants
            setupImpl@superclass();
            %obj.initFilter(obj.sampleTime, obj.delta_i, obj.delta_d, obj.g_mps2, obj.q0, obj.b_w0, obj.sigma_2_w, obj.sigma_2_a, obj.sigma_2_b_w, obj.sigma_2_yaw)
        end
        function attitude = stepImpl(obj,u, y)
            % Implement algorithm.
            attitude = 5;
        end
    end
    methods
        % Constructor must be empty for matlab.System. In Matlab call
        % initFilter after the object was created. In simulink setupImpl()
        % will be called
        function obj = subclass()
            obj@superclass();
        end
    end
end

这里是超类定义:

classdef superclass < matlab.System

    % These variables must be initialized in the simulink model
    properties
        sigma_2_w;
        sigma_2_a;
        sigma_2_b_w;
        sigma_2_yaw;
    end
    properties(Access = protected) % These variables must be initialised. Here or in the setupImpl function
        R;
        Q;
    end
    methods (Access = protected)
        function resetImpl(obj)
        end
        %% Common functions
        function setupImpl(obj)
            % Perform one-time calculations, such as computing constants
            obj.Q  = diag([obj.sigma_2_w',obj.sigma_2_b_w']); % this is line 29
            obj.R = diag([obj.sigma_2_a',obj.sigma_2_yaw']); 
        end
        function attitude = stepImpl(obj,u, y)
            % Implement algorithm.
            attitude = 5;
        end
    end
    methods
        % Constructor must be empty for matlab.System. In Matlab call
        % initFilter after the object was created. In simulink setupImpl()
        % will be called
        function obj = superclass()
             % Support name-value pair arguments when constructing object
        end
    end
end

我发现了错误。在子类的 setupImpl 函数中,我不得不调用超类的 setupImpl,并将 obj 作为参数:

setupImpl@Superclass(obj);

这是我的构造函数。在这里我没有使用 obj 作为返回值

function obj = Subclass()
    obj = obj@Superclass();
end

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