I use the example you provided on Matlab 2019b, and I am getting similar results on speed. However, I noticed that if we read the file back (no matter if it is written using Matlab, or Java) they both have 40,000,000 elements in them, whereas we have written 50,000,000 elements. Kindly comment, why it is so?

Thanks Yair. Clearing java solved the problem.

@Peyman – it’s probably due to one of the possible reasons that I listed here: http://undocumentedmatlab.com/blog/java-class-access-pitfalls

Mybe important: I’m using matlab R2008a and jdk 1.6.0 (both matlab and compilation)

??? Undefined function or method 'start' for input arguments of type 'ParallelPortReaderThread'.
Error in ==> testThread at 8
start(ParallelPortReaderThread(rr_intervals));


This is my Matlab code:

import java.lang.Thread;
import java.util.LinkedList;
rr_intervals = LinkedList();
for i = 1:10
    rr_intervals.add(0);
end
javaaddpath 'C:\Documents and Settings\user\My Documents\MATLAB\Marieke_Experiment';
start(ParallelPortReaderThread(rr_intervals));
%ParallelPortReaderThread pThr = new ParallelPortReaderThread(rr_intervals);
%pThr.start();

And this my java class:

import java.util.Random;
import java.util.LinkedList;
import java.lang.Thread;
        
public class ParallelPortReaderThread extends Thread {

    private LinkedList rrIntervals;

    public ParallelPortReaderThread(LinkedList queue) {
        this.rrIntervals = queue;
    }

    @Override
    public void run() {
        Random random = new Random();
        long x = (long) (800 + 200 * random.nextFloat());
        rrIntervals.remove();
        rrIntervals.add(x);
	try {
           Thread.sleep(x);
        } catch (InterruptedException ie) {
           ie.printStackTrace();
        }
    }

    public LinkedList getRrIntervals() {
        return rrIntervals;
    }
}

I’d be very thankful about any help and/or advice

@Leo – you can stop a Java thread using its stop() method:

jThread = MyJavaThread('F:\test.data',data);
start(jThread); % start running in parallel
...
stop(jThread);  % stop thread

See here for more details on Java threads.
Of course, if you create your own version of a Java thread, you can create a custom public method that signals the thread in a more elegant manner than the brute-force stop() method.

@Serge – you can use a simple Matlab timer for this. Read the documentation for the timer function.