MATLAB: Sharing data among AppDesigner, Functions and Simulink Model.

appdesignerglobal variablesimulink

Hi,

I have been having an issue using AppDesigner, which does call a script .m file, but the variables do not load into the base workspace (which I use in my Simulink model). I have already tried to change the .m file to a function assigning the variables globally. However, they are still not shared with my Simulink application.

How should I design "the system architecture" to use the AppDesigner which calls a .m file and consequently a Simulink model? How can the data be shared among these three applications?

Thank you.

Best Answer

Hi,

You can use assignin function to assign variables in base workspace, also try methods suggested here.

Hope it helps.

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MATLAB: How to declare a variable in the MATLAB workspace from a MATLAB function

Simulink has access to any variable defined in the MATLAB workspace. You do not need to declare a variable 'global'. In order to define a variable in the MATLAB workspace from a function, you can declare the variables in the function using the command EVALIN. For example:

function declare_variable
......
evalin('base','k=100');
......

In this example, when the function 'declare_variable' is called, it will generate a variable 'k' in the MATLAB workspace. This variable can then be seen by the Simulink model. Please note that if, before the function 'declare_variable' is called, a variable called 'k' exists in the MATLAB workspace already, calling the function 'declare_variable' will overwrite the existing variable 'k' with the new value (100).

For more information on the EVALIN function, see the following URL:

http://www.mathworks.com/access/helpdesk/help/techdoc/ref/evalin.html?cmdname=evalin

MATLAB: Constants and Matlab Workspace

The MATLAB has several different workspaces. Simulink model has its own workspace: https://www.mathworks.com/help/simulink/ug/using-model-workspaces.html. The workspace you see on the main MATLAB window is called the base workspace. The method to change a variable in base workspace depends on what you are trying to do. One way is to use the To Workspace block: https://www.mathworks.com/help/simulink/slref/toworkspace.html. The other is to use evalin and assignin functions, as shown in the attached file. To run this model, define a variable x in the base workspace by running

x = 5

Then run the model. In the Simulink model, there is a MATLAB function block, which increments the value of x at each time instant. However, note that using evalin and assignin is not a recommended practice, and they can make the model run very slow. If possible, try using the To Workspace block as it will not result in slow performance.

Best Answer

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MATLAB: How to declare a variable in the MATLAB workspace from a MATLAB function

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