从继承超类时实现matlab.system进行故障排除
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我正在尝试将matlab类实现为simulink MATLABSystem。当我实现超类时,模拟工作正常,但使用子类我得到以下错误:
“Simulink无法自动推断'subclassSystem'的输出信号属性.Simulink使用代码生成技术自动确定System对象的输出信号属性.System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'subclassSystem'发生错误。参见文件'superclass.m'第29行第28行。在大小传播阶段检测到错误。“
我在下面的代码中评论了这一行
我是否必须另外指定一些内容?
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
答案
我发现了错误。在子类的setupImpl函数中,我不得不使用obj作为参数调用超类的setupImpl:
setupImpl@Superclass(obj);
这是我的构造函数。这里我没有使用obj作为返回值
function obj = Subclass()
obj = obj@Superclass();
end
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