Model Callback and Block callback Functions Simulink - MATLAB R2018a

This video shows how to use callback features in Simulink. It explains the difference between Model and Block Callbacks in Simulink MATLAB. It shows how block parameters and workspace variable can be defined using callback functions.
In this video it shows InitFcn, StopFcn and StartFcn callback. It shows block callbacks for s subsystem block. It shows model callback for a simple simulink diagram for equation ax+b=y.
Details on this video is also available at: programmerworl...
We will be glad to hear from you regarding any query, suggestions or appreciations at: [e-mail]

[@paulb8264]

Perfect! After about an hour searching for a solution to getting my variables to run prior to my model. I kind of feel ashamed for not properly reading the documents for these Callbacks. The InitFcn vs StartFcn was the kep bit of info I was having troubles with. Thank you for taking your time to explain this concept.

[@TheCzarsoham]

This is exactly what I was looking for! Thank you so much!

[@aswinig6547]

Very nice and good information Please could you please let us know remaining init functions if possible...

[@amrahmedabbas]

hi, if i need to load a very large dataset into simulink as a lookup table. is there any way to load it only on the first run of the model and use it without reloading as the model is open? i mean like in matlab workspace when i load any variable it still exist as the workspace did not cleared. i want to do some thing like that into simulink if possible. thats because i need to run the model many times with these large data. but it took around 10 min in the compilation phase to load the variables to the simulink blocks

[@jelani-samples]

How can I make a callback that allows user input, for a variables who’s value can be changed?

[@anshulkaushik010]

How to run a script using simulink results in testing environment?

[@ProgrammerWorld]

Simple, write the Matlab script to compare the output data with the expected data and generate the report accordingly. For passing the data from one workspace to another one can use ASSIGNIN command or use EVALIN command to evaluate the function in a particular environment. Alternatively, one can use specific testing tools, such as Simulink Test to perform testing functionalities: mathworks.com/products/simulink-test.html Cheers Programmer World programmerworld.co -

[@zaidhusseinali]

Thanks for your valuable information but how could I link m.file to Simulink without running the m.file in the first place?

[@ProgrammerWorld]

Hi, Sorry, I did not understand your question completely. If you want to link the .M file to your model what you can do is just call that .M script from your model's callback function. You can also use Block callback functions depending on your use case. This has been shown in the video also. Though in the video I have focused on directly writing the script in the callback window rather than calling the script. Also, if you have to call your custom .M function doing a specific tasks then you can use MATLAB function block and call your matlab script from within it. I hope above information is useful. Else elaborate your use case and then I can try to explain further.

[@naman525]

Hello Sir, I want to put my whole m-script into the intlcallback function. Can I use the name of the m-file to define the whole script?

[@ProgrammerWorld]

Yes, you can put your whole script in one .m file and then call that m-file to run the scripts. This approach should work fine. Good Luck Programmer World programmerworld.co -

[@akashlonarkar7018]

Hello, I am getting this error while implementing a BPSK Ber plot Do you have any idea how to resolve this? Error evaluating 'StopFcn' callback of block_diagram 'test'. Callback string is ' bertool('stopped')' Caused by: Vectors must be the same length.

[@ProgrammerWorld]

I am not completely sure about bertool syntax. However, in the error message, I can see there is an extra quote mark at the end of your command. Remove last quotation mark from your below line of code: bertool('stopped') ' It should solve the issue. Cheers Programmer World programmerworld.co -

[@benjomino87]

is there any way to use the callback function to comment a simulink block?

[@ProgrammerWorld]

I think that it can be done. You have to just run below line of scripts in the callback function: set_param(blockName,'Commented','on') set_param(blockName,'Commented','off') Cheers Programmer World programmerworld.co -

[@ashokreddyk8582]

Hi sir how to access external excel file in to simulink parameters

[@ProgrammerWorld]

You can simply use xlsread or readtable command to read the data from external Excel file into MATLAB Workspace. If you do not want a separate matlab script but want to directly have these commands in Simulink then you can write these commands in model or block callback or mask initialization functions based on your requirement. There are also options of using matlab commands in simulink using matlab function block. Hope it helps.

[@potnuruabhishek3943]

Sir i have one doubt in using of ContinueFcn callback and my objective is to vary a parameter while simulation is running. please let me know sir

[@ProgrammerWorld]

No, I don't think continueFcn callback can be used to change the parameters value in the middle of the simulation. The reason for that is once the simulation starts, the model is in a compiled state and during the execution it's the compiled model which runs. So, any change in the variable/ parameter's value (from the base workspace) will not get reflected in Simulink in the middle of the simulation. AFAIK, the only option is to restart the simulation after changing any parameters value. The use of continueFcn is to write or update any values in the base workspace or export certain details from the Simulink model. Cheers Programmer World programmerworld.co

[@muhammadahsanzamee4385]

Dear potnuru abhishek have you found any solution to your problem? I am having the same issue. It will be kind of you if you share your knowledge here.

[@potnuruabhishek3943]

@@muhammadahsanzamee4385 No I didnt find any solution, but in my work, I want to change the inductor value while simulation, so I find the saturation i and flux parameters and proceeded accordingly