Why does my system object get an assertion failure error

Question

银河 2023-8-17

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2009507-why-does-my-system-object-get-an-assertion-failure-error

编辑： Walter Roberson 2025-2-1

PedestrianTrackingYOLODetections.mat

Hello all

I am kinda new in MATLAB/Simulink，and learning the multi-object tracking task based on simulink by Track Closely Spaced Targets Under Ambiguity in Simulink. I want to finish image tracking task. I already have the target detection result based on YOLO. When I was writing based on the HelperDataLogReader class in the example, an assertion failure occurred. But I have looked up a lot of relevant materials but can't solve it, and I hope someone can help me. Here is my code and the target detection result of YOLO, thank you so much！

classdef  (StrictDefaults)HelperDataReader < ...
        matlabshared.tracking.internal.SimulinkBusUtilities
    
    % This is a helper block for example purposes and may be removed or
    % modified in the future.
    %
    % Copyright 2019 The MathWorks, Inc.
    
    properties(Constant, Access=protected)
        pBusPrefix = 'BusDataLogReader'
    end
    properties(Access = public, Nontunable)
        Data
    end
    
    properties(Nontunable)
        Frame = fusionCoordinateFrameType.Rectangular
    end
    
    properties(Access = private)
        %pCurrentIndex
        pCurrentIndex = 0
        
        %pMaxIndex     Saved the maximum time step index in the data file
        pMaxIndex
        
    end
    
    methods
        function obj = HelperDataReader(varargin)
            % Constructor
            setProperties(obj,nargin,varargin{:});
        end
    end
    
    methods(Access=protected)
        
        function [out, argsToBus] = defaultOutput(obj)
            objAtt = struct('Score',double(1));
            out = struct('Time',double(1),... 
                'Measurement',double(zeros(1, 4)),...
                'MeasurementNoise',double(zeros(4)),... 
                'SensorIndex',double(0),...
                'ObjectClassID',double(0),...
                'ObjectClassParameters', [],...
                'ObjectAttributes',objAtt);
            argsToBus = {out};
        end
        
        % Currently only support simulink environment, so nothing to do
        % here
        function y = sendToBus(~,x,varargin)
            [newx,num] = objDet2Struct(x);
            y = struct('Detections',newx,'NumDetections',num);
        end
        
        function [det, time] = stepImpl(obj)
            if ~obj.isEndOfData()
                obj.pCurrentIndex = obj.pCurrentIndex + 1; 
            end
            newDet  = obj.Data.detections{obj.pCurrentIndex}; 
            det = sendToBus(obj,newDet); 
            time = newDet(1).Time;
        end
        
        function setupImpl(obj, varargin)
            obj.Data = load('PedestrianTrackingYOLODetections.mat');
            obj.pMaxIndex =numel(obj.Data.detections); 
        end
        function loadObjectImpl(obj,s,wasLocked)
            % Set properties in object obj to values in structure s
            
            
            % Set public properties and states
            loadObjectImpl@matlab.System(obj,s,wasLocked);
        end
        
        function status = isEndOfData(obj)
            % Return true if end of data has been reached
            status = (obj.pCurrentIndex == obj.pMaxIndex);
        end
        
        function s = saveObjectImpl(obj)
            % Set properties in structure s to values in object obj
            
            % Set public properties and states
            s = saveObjectImpl@matlab.System(obj);
        end
        
        % function varargout = getOutputDataTypeImpl(obj)
        %     varargout{1} = getOutputDataTypeImpl@matlabshared.tracking.internal.SimulinkBusUtilities(obj);
        %     varargout{2} = "double";
        % end
        
        function str = getIconImpl(~)
            str = sprintf('Helper\nDataLog\nReader');
        end
        
        function varargout = getOutputNamesImpl(~)
            varargout{1} = sprintf('Detections');
            varargout{2} = sprintf('Time');
        end
        function varargout = getInputNamesImpl(~)
            varargout{1} = sprintf('In');
        end
        function [out1,out2] = isOutputFixedSizeImpl(~)
            out1 = true;
            out2 = true;
        end
        function [out1,out2] = getOutputSizeImpl(~)
            out1 = [1 1];
            out2 = [1 1];
        end
        
        function [out1,out2] = isOutputComplexImpl(~)
            out1 = false;
            out2 = false;
        end
    end
    methods(Static, Hidden)
        function flag = isAllowedInSystemBlock
            flag = true;
        end
        
    end
    methods(Static, Access=protected)
        function header = getHeaderImpl
            % Define header panel for System block dialog
            header = matlab.system.display.Header(...
                'Title', 'DataLogReader', ...
                'Text', getHeaderText());
        end
        function simMode = getSimulateUsingImpl
            % Return only allowed simulation mode in System block dialog
            simMode = 'Interpreted execution';
        end
        function flag = showSimulateUsingImpl
            % Return false if simulation mode hidden in System block dialog
            flag = false;
        end
    end
    
end
function str = getHeaderText
str = sprintf('The DataLog reader reads a struct file and it outputs the detection and time.');
end
function [yDet,num] = objDet2Struct(det)
num = numel(det);
for i =1:num
    yDet(i) = struct('Time',det(i).Time,...
        'Measurement',det(i).Measurement,...
        'MeasurementNoise',det(i).MeasurementNoise,...
        'SensorIndex',det(i).SensorIndex,...
        'ObjectClassID',det(i).ObjectClassID,...
        'ObjectClassParameters', [],...
        'ObjectAttributes',det(i).ObjectAttributes);  %#ok<AGROW>
end
end

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Answer 1

Karan Singh 2025-2-1

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2009507-why-does-my-system-object-get-an-assertion-failure-error#answer_1558789

HI @银河,

I have experienced an assertion failure before. In my case, it occurred while I was using some MEX files. However, I resolved it by reinstalling the MinGW compiler.

That doesn’t seem to be the issue in your case. I tried running the code you provided, but I received an empty result. Since it runs without any errors on my end, it might indicate an incorrect installation on your side as well. You could try reinstalling it once again—I believe that might fix the issue for you.

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