Real-Time Interface between App in AppDesigner and Simulink using parsim - Error: not enough input arguments @(x)addlistener

More questions to the topic.

https://de.mathworks.com/matlabcentral/answers/2173224-real-time-interface-between-app-in-appdesigner-and-simulink-using-parsim#answer_1558008

Error using nhf>@(x)addlistener(x,'SimulationOutput','PostSimFcn',listener) (line 233)

Not enough input arguments.

in my simulink-modell i do the following. Is something wrong here?

Should i write listener = @nhf (Class)?

This function run in nhf (Class)

function Simulate(obj)

for simNr = numel(obj.Data):-1:1

in(simNr) = Simulink.SimulationInput(obj.simModel);

for prop = fieldnames(obj.Data(simNr))'

in(simNr) = in(simNr).setVariable(char(prop), obj.Data(simNr).(char(prop)));

% tbd: assign to baseworkspace

% assignin('base',char(prop), obj.Data(simNr).(char(prop)));

end

if isdeployed

in(simNr) = simulink.compiler.configureForDeployment(in(simNr));

end

end

% - Disable the automatic opening of the visualization viewer

% - Should be done for all models before compiling

% -------------------------------------------------------------

%open_system(obj.simModel);

%set_param(obj.simModel, 'SimMechanicsOpenEditorOnUpdate', 'off');

% Set up the listener for progress updates

listener = @(src,event) updateProgress(app,event);

% Save results internally

obj.simOut = parsim(in, ...

'ShowProgress','on',...

'TransferBaseWorkspaceVariables','on',...

'SetupFcn',@(x) addlistener(x, 'SimulationOutput', 'PostSimFcn', listener));

What is wrong in the function ('SetupFcn', @(x) addlistener(x, 'SimulationOutput', 'PostSimFcn', listener) ?

Is the function in simulink wrong?

Answer 1

[Gayathri]

Hi @Fabian,

The error you are encountering is because the arguments given to the "addlistener" function is not correct. The function required an "event" as input and the "postSimFcn" will not be considered as an event here.

Please make sure that "SimulationOutput" is defined as an event in the class definition as follows.

events
    Simulationoutput % Define a custom event
end

Also, make sure to add the "setPostSimFcn" as shown below.

for simNr = numel(obj.Data):-1:1
    in(simNr) = Simulink.SimulationInput(obj.simModel);
    for prop = fieldnames(obj.Data(simNr))'
       in(simNr) = in(simNr).setVariable(char(prop), obj.Data(simNr).(char(prop)));
       % tbd: assign to baseworkspace
       % assignin('base',char(prop), obj.Data(simNr).(char(prop)));
       in(simNr) = in(simNr).setPostSimFcn(@(simOut) obj.postSimFunction(simOut, simNr));
    end
    if isdeployed
       in(simNr) = simulink.compiler.configureForDeployment(in(simNr));
    end
 end

Please modify the "parsim" command as follows to correct the arguments of the "addlistener" function.

obj.simOut = parsim(in, ...
                'ShowProgress', 'on', ...
                'TransferBaseWorkspaceVariables','on',...
                'SetupFcn', @(x) addlistener(obj, 'Simulationoutput', @updateProgress));

Now, you can modify the post simulation function to notify the listener once the event is completed. You can decide on when to call the "notify" function. But below is an example on how you can use the function in your implementation.

function simOut = postSimFunction(obj, simOut, simNr)
    try
        % Example: Save each simulation output to a file
        save(sprintf('output_%03d.mat', simNr), 'simOut');
        % Notify listeners that the simulation output is ready
        notify(obj, 'Simulationoutput', SimulationCompletedData(simNr, simOut));
    catch ME
        disp(['Error in PostSimFcn: ', ME.message]);
    end
end

classdef SimulationCompletedData < event.EventData
    properties
        SimulationNumber
        SimulationOutput
    end
    
    methods
        function data = SimulationCompletedData(simNr, simOut)
            data.SimulationNumber = simNr;
            data.SimulationOutput = simOut;
        end
    end
end

Here, I have provided the normal workflow and syntaxes, you can modify the code as required for "AppDesigner".

For more information on "addlistener" and "notify" function, please refer to the below documentation links.

https://www.mathworks.com/help/matlab/ref/handle.addlistener.html

https://www.mathworks.com/help/matlab/ref/handle.notify.html

Hope you find this information helpful!

[Fabian]

Hello Gayathri

i have problems to implement these in my appdesigner.

My App handle already with a script and so it is not possible to do a second classdef.

How can i solve this issue?

Next to this, i got the Error 'PostSimFcn'

How can i handle this?

[Fabian]

Hello if i try something else:

new .m function for classdef

classdef SimulationCompletedData < event.EventData

properties

SimulationNumber

SimulationOutput

end

methods

function data = SimulationCompletedData(simNr, simOut)

data.SimulationNumber = simNr;

data.SimulationOutput = simOut;

end

end

end

Then i got this error:

Why?

Kind regards

Fabian

[Gayathri]

@Fabian, can you provide your complete code including the class definitions, so that I can look into the issue in detail?

[Fabian]

%Hello here ist the Code: nhf_weiterentV01 handle with the mlapp-File
classdef nhf_weiterentV01 < handle 

   events
        Simulationoutput %Define a custom event
   end 
   
   
  function Simulate(obj)
      for simNr = numel(obj.Data):-1:1
                in(simNr) = Simulink.SimulationInput(obj.simModel);
                for prop = fieldnames(obj.Data(simNr))'
                    in(simNr) = in(simNr).setVariable(char(prop), obj.Data(simNr).(char(prop)));
                    % tbd: assign to baseworkspace
                    % assignin('base',char(prop), obj.Data(simNr).(char(prop)));
                    in(simNr) = in(simNr).setPostSimFcn(@(simOut) obj.postSimFunction(simOut, simNr));
                end
                if isdeployed
                    in(simNr) = simulink.compiler.configureForDeployment(in(simNr));
                end
      end
      
      obj.simOut = parsim(in, 'ShowProgress','on',...
                'TransferBaseWorkspaceVariables','on',...
             'SetupFcn', @(x) addlistener(obj, 'Simulationoutput', 'PostSimFcn', @updateProgress));
      
      function simOut = postSimFunction(obj, simOut, simNr)
                try
                    % Example: Save each simulation output to a file
                    save(sprintf('output_%03d.mat', simNr), 'simOut');
                    % Notify listeners that the simulation output is ready
                    notify(obj, 'Simulationoutput', SimulationCompletedData(simNr, simOut));
                catch ME
                    disp(['Error in PostSimFcn: ', ME.message]);
                end
      end
  end
  
  
  % in a second .m-File (SimulationCompletedData.m)
  classdef SimulationCompletedData < event.EventData
    properties
        SimulationNumber
        SimulationOutput
    end
    
    methods
        function data = SimulationCompletedData(simNr, simOut)
            data.SimulationNumber = simNr;
            data.SimulationOutput = simOut;
        end
    end
  end
  
  
  % in the mlapp-Code: 
  function updateGUI(app, varargin)
            progress = event.Progress;
            app.PercentageOfSim.Value = progress;
  end
  
  
  % in the model for StartFcn:
  %The GUI handles are by
set(0,'ShowHiddenHandles','on');
app = evalin('base', 'app');
%Set up the arguments that will go out from Outport to event callback listener
blk='D2002_PTD1000/TimeOut';
event = 'PostOutputs';
listener = @(h,e) updateGUI(app);
%Create the listener
h = add_exec_event_listener(blk,event, listener);

[Fabian]

@Gayathri Thank you for your help.

[Gayathri]

@Fabian, I am not really sure of how you have designed your "app". I had inserted a "button" to start the simulation once the button is pressed. Please look into the code below of the ".mlapp" file which I had used to verify the code you provided.

classdef app < matlab.apps.AppBase

    % Properties that correspond to app components
    properties (Access = public)
        UIFigure        matlab.ui.Figure
        Button          matlab.ui.control.Button
        EditField       matlab.ui.control.NumericEditField
        EditFieldLabel  matlab.ui.control.Label
    end

    
    properties (Access = private)
        SimulationObject % Description
    end
    
    methods (Access = public)
        
        function updateGUI(app, varargin)
            progress = event.Progress;
            app.PercentageOfSim.Value = progress;
        end
    end
    

    % Callbacks that handle component events
    methods (Access = private)

        % Button pushed function: Button
        function startFcn(app, event)
            exampleData=struct();
            exampleData(1).var1 = 1;
            exampleData(2).var1 = 2;
           app.SimulationObject = nhf_weiterentV01(exampleData);
    % Set up data for the simulation, e.g., app.SimulationObject.Data
            app.SimulationObject.Simulate();

        end
    end

And I had created "nhf_weiterentV01.m" and "SimulationCompletedData.m" files in the same folder as that of the ".mlapp" file with the class definitions.

Please modify your "nhf_weiterentV01.m" file as per the code shown below. As I could see a function defined within another function in the code you provided. This might be due to the wrong placement of "end" function.

    classdef nhf_weiterentV01 < handle
    properties
        simModel = 'simple'; % Name of your Simulink model
        Data;                % Data for simulations
        simOut;              % Simulation output storage
    end
    
    events
        Simulationoutput % Define a custom event
    end
    
    methods
        function obj = SimulationExample(data)
            obj.Data = data;
        end
        
        function Simulate(obj, app)
            % Prepare the SimulationInput objects
            for simNr = numel(obj.Data):-1:1
                in(simNr) = Simulink.SimulationInput(obj.simModel);
                in(simNr) = in(simNr).setVariable('gainValue', simNr); % Example variable setup
                for prop = fieldnames(obj.Data(simNr))'
                    in(simNr) = in(simNr).setVariable(char(prop), obj.Data(simNr).(char(prop)));
                end
                in(simNr) = in(simNr).setPostSimFcn(@(simOut) obj.postSimFunction(simOut, simNr));
            end
            
            % Set up the listener for progress updates
            %addlistener(obj, 'Simulationoutput', @(src, event) app.updateProgress(event));
            
            % Run simulations using parsim
            obj.simOut = sim(in, ...
                'ShowProgress', 'on', ...
                'SetupFcn', @(x) addlistener(obj, 'Simulationoutput', @updateProgress));
        end
        
        function simOut = postSimFunction(obj, simOut, simNr)
            try
                % Example: Save each simulation output to a file
                save(sprintf('output_%03d.mat', simNr), 'simOut');
                % Notify listeners that the simulation output is ready
                notify(obj, 'Simulationoutput', SimulationCompletedData(simNr, simOut));
            catch ME
                disp(['Error in PostSimFcn: ', ME.message]);
            end
        end
    end
end



% Define a mock updateProgress function in your app
function updateProgress(~, ~)
    fprintf('Simulation completed.\n');
    % Additional processing can be done using event.SimulationOutput
end

With these changes, I was able to run the ".mlapp" file without any errors. Please find the screenshot below which shows the same.

[Fabian]

@Gayathri now you use only sim in your function.

We want to use parsim. And we want to get the process of each simulation in parsim. Is that possible?

[Gayathri]

@Fabian, it will work even if you change "sim" to "parsim" in the code.

Here is the output after modifying the code to use "parsim" function.

[Fabian]

Unfortunately, it's not exactly what I'm looking for.

I am looking for a way to read out a variable that I change in the Simulink model during the simulation during the parsim simulation and display it in the app. Quasi as a live variable from the Simulink model during parsim