Calling User-defined Script from Java

I've installed R2017a and try to use Matlab Engine API for Java to run a user-defined script/function from Java.

The examples provided here(https://uk.mathworks.com/help/matlab/matlab_external/java-example-source-code.html) work perfectly fine. These examples, however, make use of Matlab package functions such as gcd, max etc.

I can't find any examples that enable to import and execute Matlab scripts (functions) defined by a user. Some examples for Python are provided here(https://uk.mathworks.com/matlabcentral/answers/322114-calling-script-from-python) but unfortunately, do not work in Java.

Any ideas how to achieve this functionality?

[Amina Rahman]

Did you mean this solution?

[Simos Gerasimou]

I tried the solution suggested at SO using matlabcontrol 4.1.0, but unfortunately, it does work for Matlab2017a.

Also, since a Java API for Matlab has been released, I expected that the functionality to do what matlabcontrol does would be supported as well!!

Answer 1

[Amit Doshi]

Hello,

You can call your function using 'eval'.

For example,

           //Start MATLAB asynchronously
              Future<MatlabEngine> eng = MatlabEngine.startMatlabAsync();  
           // Get engine instance
              MatlabEngine ml = eng.get();      
          // Evaluate the command to cd to your function
              ml.eval("cd path/to/funtion");          
      // Evaluate the function
          ml.eval("myFunction(args)");

[Jiss George]

can u please give more explanation, when i am executing this ml.eval("cd path/to/funtion"); am getting error as cd can't cd to directory.

[Manuel Lindorfer]

You have to specify the apostrophes properly when executing the command, similar to when executing it within the Matlab environment. For example,

// Start Matlab
Future<MatlabEngine> engine = MatlabEngine.startMatlabAsync();
MatlabEngine eng = engine.get();

// Change directory and evaluate your function
eng.eval("cd 'path/to/your/function'");
eng.feval("yourFunction", param1, param2, ...);