Run matlab m file from simulink

Hello, I have matlab M file(test.m), which have single line to call Python file [ !c:\-------\Python.py]. Kindly let me know, how to call this test.m from Simulink model.

I would like to run test.m, once the condition met in simulink model input.

Any reply will be greatly appreciated. Thanks

Answer 1

[Riya]

Hi Nethaji,

I understand that you are trying to execute a MATLAB script (“test.m”), which calls a Python file, from within a Simulink model when a specific condition is met based on Simulink inputs. There are two methods to do so:

Method 1: Using a “MATLAB Function Block” in Simulink

You can use a “MATLAB Function Block” to execute “test.m” when the condition is met. Inside the block, use the following function:

function call_script(u) 
if u > threshold  % Replace 'threshold' with your desired condition 
    evalin('base', 'test');  % Execute test.m 
end 
end 

Kindly ensure that the “test.m” file is in MATLAB’s working directory or add its path using:

addpath('C:\path\to\your\script') 

Finally, connect the block’s input to the signal that determines when to execute the script.

Method 2: Using an “S-Function Block”

You can also use an “S-Function block” with the following code:

function Outputs = call_script(~) 
evalin('base', 'test'); 
end 

This ensures that the “test.m” file runs only when triggered by Simulink’s input condition.

For further reference on executing MATLAB scripts from Simulink, kindly refer to the below official documentation:

• MATLAB Function Block: https://www.mathworks.com/help/simulink/ug/what-is-a-matlab-function-block.html
• S-function: https://www.mathworks.com/help/simulink/sfg/what-is-an-s-function.html

[Walter Roberson]

Neither of these approaches are likely to work unless Rapid Acceleration is turned off.