How to Invoke a User-Defined MATLAB Function from Java Using matlabcontrol.jar

How can I call a user-defined MATLAB function from Java using matlabcontrol.jar?

import com.mathworks.mde.MLDesktop; 
import matlabcontrol.*; 

public class MatlabCaller {
    public static void main(String[] args) throws MatlabInvocationException {
        MatlabProxyFactory factory = new MatlabProxyFactory();
        MatlabProxy proxy = factory.getProxy();
        proxy.eval("myFunction");  // Call your MATLAB function here
    }
}

Using matlabcontrol.jar allows Java applications to access and execute MATLAB functions programmatically. This makes it possible to integrate MATLAB's capabilities with Java applications efficiently. In this guide, we will cover how to set up the environment and invoke a user-defined MATLAB function from Java.

import matlabcontrol.*; 

public class MatlabFunctionCaller {
    public static void main(String[] args) {
        try {
            // Create the proxy factory
            MatlabProxyFactory factory = new MatlabProxyFactory();
            // Get the proxy
            MatlabProxy proxy = factory.getProxy();
            // Call a predefined MATLAB function
            proxy.feval("myFunction", inputData); // InputData can be an array or other types.
            // Disconnect the proxy
            proxy.disconnect();
        } catch (MatlabInvocationException e) {
            // Handle possible exceptions
            e.printStackTrace();
        }
    }
}

Causes

• MATLAB function not correctly defined or indexed in the MATLAB path.
• Errors in Java setup or mismatched MATLAB and Java versions.
• Issues with the matlabcontrol.jar library configurations.

Solutions

• Ensure your MATLAB function is accessible and defined in the current directory or MATLAB path.
• Check that the MATLAB and Java versions are compatible and properly configured.
• Verify that matlabcontrol.jar is included in your Java project’s build path.

Mistake: Failing to set the correct MATLAB path for your function.

Solution: Ensure that your function is saved in the MATLAB's current directory or add its directory to the MATLAB path through `addpath('folderPath')`.

Mistake: Not handling exceptions when calling the MATLAB functions.

Solution: Always implement proper exception handling to effectively troubleshoot issues and to maintain program stability.