Simulink import matrix directly to matlab function block

I am trying to import a matrix from matlab workspace directly to a matlab function without specifying it as a input port. I only want to import the matrix into function, change its values and thats all. I don't want it to be a signal. Can I do that and if so how?

Answer 1

[Rick Rosson]

There are two possibilities that I can think of:

1. Parameter
2. Data Store Memory

Parameter

You can specify the matrix as a parameter of the function rather than as an input to the function.

I am not 100 percent sure that this will work as you intend, but please try the following:

1. Double-click on the MATLAB Function Block to open the MATLAB Function Block Editor window.
2. Specify a variable in the list of input arguments to represent the matrix. The name of this variable should be the same as the name of the variable defined in the MATLAB Workspace. I will assume this variable is called A.
3. At the top of the window is a toolbar. Find the "Edit Data/Ports" tool, and click on it to bring up the Ports and Data Manager.
4. Find the variable A in the list of arguments in the left pane of the dialog box.
5. The "Scope" of this variable should be listed as "Input".
6. Change the "Scope" of A from "Input" to "Parameter".
7. Close the Ports and Data Manager.
8. Close the MATLAB Function Block Editor.
9. Save the model.

Data Store Memory

If that does not work for your use case, then you can try to define the matrix as a Data Store Memory (DSM) in Simulink, and access it from the MATLAB Function block as a global variable.

HTH.

Rick

[alp]

parameter method imports the matrix but I can't change its values. Every time the function block is entered the original value of the matrix is imported.

Can I access data store memory from function block? My initial impression is that only Data Store Read and Data Store Write blocks can access it.

[Rick Rosson]

Yes, you can access it from inside the function. Again, you need to go into the Ports and Data Manager and specify that the variable is a DSM.

[Mohamed Elfatih]

Thanks it worked for me :)

[Andrea Giambone]

The 'parameter' solution works for me, thanks a lot!