How to simulate a model through App Designer, set parameters and plot outputs in App Designer? 

gracias

It is possible to design the GUI such that the changes are reflected instantly in the plot. For this you simply have to add callback function (value change callback) to the slide bar. And in this call back function rewrite the plot command for the axes. This will refresh the plot immediately for any value change of the slide bar.

别客气 Cheers Programmer World programmerworld.co -

same problem

When you run the Simulink model from the App then by default all the data gets output to function workspace and not base workspace. To access the data, you would have to use "caller" parameter instead of "base" in your evalin command. (x_parameter=evalin('caller', Res.Chassis.F_Axle') Other option is to use ASSIGNIN command to transfer the data from function to base worksapce. assignin('base', 'Res.Chassis.F_Axle', Res.Chassis.F_Axle_base) Hope above helps. Cheers Programmer World programmerworld.co -

@@ProgrammerWorld Many thanks for your reply! I will be able to try it out in a couple of days and will report here. Thank you!

Same issue here.Can you help please?

To communicate between 2 different sessions of Matlab, you will have to build some kind of communication channel between the two based on IP protocol. It can be done using Java class for communication. Cheers Programmer World programmerworld.co -

No, in progress simulation data cannot be plotted in the App designer, because in the below "simout" will get the values once the simulation is finished: simout = sim(‘SineWave_SL’, ‘StopTime’, num2str(app.DurationSlider.Value)); Which is further used to plot using the below command: plot(app.UIAxes, simout.SineWaveValue.Time, simout.SineWaveValue.Data); For reference, details shown in this video is also shared in the below link: programmerworld.co/matlab/simulate-a-model-through-app-designer-set-parameters-and-plot-outputs-in-app-designer/ Cheers Programmer World programmerworld.co -

@@ProgrammerWorld so do u mean I will get the plot on the app designer only after the graph is completed in the scope block(it takes around 800 sec for the simulation to complete )??? Plzzz reply I really need help

Yes, plot will come in app designer after the simulation completes. Cheers Programmer World programmerworld.co -

I think you can simply use image button to show the image in your App developed in App designer in R2017b. Please refer to my below video for the same: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-3IQMZQ7JBn0.html Good Luck Programmer World programmerworld.co -

@@ProgrammerWorld - Thank you so much, I didn't know this could be done so easily. Keep uploading nice and informative videos on such topics. 👍👍

This can be done easily. You will have to change the visibility flag of the buttons you want to control in the callback functionality.

Programmer World thanks!

I do not have a video on Arduino as of now. However, in my below video it shows how to capture live video from the webcam and display it in the App Designers. You may refer to it: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-xp3KtoWaGX8.html Cheers Programmer World programmerworld.co -

@@ProgrammerWorld friend, I have more question. I have an AXES component graph, and I want to change its x or y axis' maximum value with slider component which when I change the slider value then graph's x or y axis maximum value will be changed too. How can we apply such feature? app.UIAxes.XLim = [0 app.hx711yAxisSlider.Value]; I write this line of code but on the App Designer GUI, when I change the slider value - the x axis maximum value is not changing, which it is not updating. I will be very glad if you would guide me, thank you very much.

Yes, why not ... Just in the call back method of the button put the right API to be called. Good Luck Programmer World programmerworld.co -

@@ProgrammerWorld Thank you for your reply But in the button call back either the value is for changed or changing of the button but I want to change the state by pressing external button. Do I need to put the API for that?

This App Designer GUI uses a Simulink model to simulate and plot the data. So, I am not sure, but please check if the model file (.slx file) is included while creating the .exe application. If the model file is not available then the App will not be able to plot as it will not get the data. I hope above clarifies and helps. Just for reference, the complete code shown in this tutorial is also shared in the below page: programmerworld.co/matlab/simulate-a-model-through-app-designer-set-parameters-and-plot-outputs-in-app-designer/ Cheers Programmer World programmerworld.co -

Parameters values such as amplitude or frequency can be set in the workspace or sim command. However, once set the values cannot be changed for the simulation in progress. So, in order to change the parameter values, you may have to stop any previously running simulation and restart the sim command with updated values. I hope this answers your question.

@@ProgrammerWorld Thanks for prompt response!! It clarified my doubt and what I understood that we can't send /receive parameters while model is running. If you found any way to do this plzz let me know.

Hi, There should be no reason for your predictFcn command to not work in the App designer code. Of course I assume you have the necessary toolboxes 'Statistics and Machine Learning Toolbox' installed on your machine. Now, if you could have provided the error message you are observing then it would have helped to evaluate the reason behind the failure. However, one reason could be the variables are not present in the App workspace. To explain it further, let's assume you have created your trained model in the base workspace of matlab and trying to access the same from the App code then it won't work as the variable is not present in the App workspace. You will have to use ASSIGNIN or EVALIN command to do the respective adaptation of the workspace variables. If above does not helps to resolve your query then please copy the error message here. Then probably I can evaluate it better.

@@ProgrammerWorld This is the error message: Undefined variable "modelh2s" or class "modelh2s.predictFcn". I suppose you are right about using ASSIGNIN or EVALIN, but I am not smart enough to use them. Could you help me a bit more with explaining which one to use and how? I have read the syntax for both these commands, but I find them confusing.

From the error message it is very clear that the issue is that the variable is not present in the App Designer workspace. I assume you created your predictive model in the base workspace, so the variable "modelh2s" exists only in base workspace. To access the variable from the base workspace into your local (App Workspace), you can use the below command. This should create a variable "modelApp" in the local workspace. modelApp = evalin('base', 'modelh2s'); I hope the above helps you in resolving your issue.

@@ProgrammerWorld In my country we have a saying: when you're stupid, life is also hard. I have been trying to get my head around this for a few days now. Thank you for making my life a little easier. I ended up using evalin to create the modelApp with a struct insted of a function. Works perfectly!! This is the piece of code i wrote: function ButtonPushed(app, event) modelApp=evalin('base','modelPredictieh2s'); a=app.amineEditField.Value; b=app.swsEditField.Value; array2table(a); array2table(b); c=horzcat(a, b); d = modelApp.predictFcn(c); app.rezEditField.Value = d; end Thank you so much!

@@ProgrammerWorld Here I am, returning to you. After using evalin with success, I have tried compiling my app as a standalone. The GUI loads, but the calculation does not. I am guessing it is because evalin? Is there any otherway to load the .mat file I need into the code so that it works in standalone version? I have tried to make a simpler GUI and deploy it as standalone and it worked, so there is no problem with the compiler

Please watch my below video. In this it is shown how to get webcam video in gui using Matlab app designer. ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-xp3KtoWaGX8.html

You can do this easily by using XLSREAD command for getting data from excel sheet. For other files you can use fopen, fscanf, fgets, fread, etc command to browse the data. Use above command in the callback of your pushbutton. Extract the data in some local variable. And then use this local variable to pass the input to the Simulink model. You can exchange the data through base workspace using the assignin command as shown in my video presentation. And of course you can simuate your model from your gui using sim which is also shown in the video presentation.

@@ProgrammerWorld Thanks a lot sir your video helped me alot Also I want to ask if there is any other way to hide a plot after pushing a button I used app.plot.Visible='Off' It worked the axes were hidden but the plot was still visible I cannot hide the plot

I think what you are looking here is 'cla' command. So, calling cla(app.UIAxes) should clean up your axes with any plots your have drawn on it. Then you can call your app.UIAxes.Visible='off' to hide the axes itself. Good Luck PW!

Thanks alot

@@ProgrammerWorld sir I tried but I couldn't do it If it's possible could you please make a video on this topic??

Can you please be a bit more specific? You want to translate the the coordinates in to what object? Anything which can be done in Matlab script can be done in App designer. So, details will help me to understand your objective here. Cheers Programmer World programmerworld.co -

An example of changing parameters from App designer is shown in this video. Check line number 18 of my code. The amplitude value of sine wave is set in the App designer which is used in Simulink model.

@@ProgrammerWorld Thank you so much sir. Sir please make a video on making a app standalone when the app is depending on simulink file and simulink is depending on excel sheet connected to it.

@@darshankannur3682 Hi, In this video it very nicely shows the interaction between App designer and Simulink model. It gives inputs to the Simulink from App designer and displays the output of Simulink model in App designer. However, if you want to have an interaction or dependency with the Excel sheet, then you can refer to my below videos. In the below video it shows how you can enable traceability between the Excel sheet and Simulink model: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-74T8RWyIbPs.html In the below video it shows how you can export the Simulink data to an Excel sheet: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-P6LycAJmw3M.html Hope above helps. Cheers Programmer World programmerworld.co -

@@ProgrammerWorld yeah sir I have already did the excel part using from spreadsheet block. But Sir I want to know how make an app stand alone desktop app. When it is in interface with simulink and excel. I tried but app is not running. I think I have missed links and files. Can u please make a video on that.. Thank you in advance. ☺

@@darshankannur3682 OK, thanks for detailed input. So, basically the requirement is to have a standalone desktop application which can interact with an excel sheet and Simulink model. I will try to make a tutorial on above topic and will let you know once I post it. Thanks again. Cheers Programmer World programmerworld.co -

Below will work: simout = sim('SineWave_SL', 'StopTime', 'inf'); Also, simulating the model just with the model name as in below will take the stop time from the configuration of the model. simout = sim('SineWave_SL') So, if in the model configuration the simulation time is set to inf, the model will simulate to infinity. Please note: when simulating a model with infinite stop time, to stop the simulation, you must press Ctrl+C. Ctrl+C breaks the simulation, however, the simulation results are not saved in the MATLAB workspace. For reference, the complete source code shown in this video is also shared in the below link: programmerworld.co/matlab/simulate-a-model-through-app-designer-set-parameters-and-plot-outputs-in-app-designer/ Cheers Programmer World programmerworld.co -

@@ProgrammerWorld thank u so much

I need to plot more than out how can I do it because i try it but i have a errour: data cannot have more than 2 dimentions

@@ouafaeer-rachedy8078 You can use plot3 for plotting 3 dimensional points. Cheers Programmer World programmerworld.co -

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No set_param and assignin are different functions. Instead of this: assignin(‘base’,’Ampl’,app.AmplitudeSlider.Value); You can try this: set_param('SineWave_SL', 'Ampl', app.AmplitudeSlider.Value) It should work. For reference, details shown in this video is also shared in the below link: programmerworld.co/matlab/simulate-a-model-through-app-designer-set-parameters-and-plot-outputs-in-app-designer/ Cheers Programmer World programmerworld.co -