Exception in MatlabControl when running MATLAB function outside MATLAB

Question

I need help to connect between Java and MATLAB via MatlabControl .

firstly i wanted to test code in walkthrough but every time i got same exception :

myfunc.m :

function myfunc()
    disp('hello from MYFUNC')
end

Java:

class ShowImage {

 public static void main(String[] args)
        throws MatlabConnectionException, MatlabInvocationException
    {
         // create proxy
         MatlabProxyFactoryOptions options =
            new MatlabProxyFactoryOptions.Builder()
                .setUsePreviouslyControlledSession(true)
                .build();
        MatlabProxyFactory factory = new MatlabProxyFactory(options);
        MatlabProxy proxy = factory.getProxy();

        // call builtin function
        proxy.eval("disp('hello world')");

        // call user-defined function (must be on the path)
        proxy.eval("addpath('E:\\vm')");
        proxy.feval("myfunc");
        proxy.eval("rmpath('E:\\vm)");

        // close connection
        proxy.disconnect();

}}

and here's exceptions :

Exception in thread "main" matlabcontrol.MatlabConnectionException: Could not launch MATLAB. Command: [matlab, -r, javaaddpath 'C:\Users\walaa\Desktop\matlabcontrol-4.0.0.jar'; matlabcontrol.MatlabClassLoaderHelper.configureClassLoading(); javarmpath 'C:\Users\walaa\Desktop\matlabcontrol-4.0.0.jar'; matlabcontrol.MatlabConnector.connectFromMatlab('PROXY_RECEIVER_42dd44d9-815e-41ad-bec9-e469718b5710', 2100);]
    at matlabcontrol.RemoteMatlabProxyFactory.createProcess(RemoteMatlabProxyFactory.java:305)
    at matlabcontrol.RemoteMatlabProxyFactory.requestProxy(RemoteMatlabProxyFactory.java:116)
    at matlabcontrol.RemoteMatlabProxyFactory.getProxy(RemoteMatlabProxyFactory.java:134)
    at matlabcontrol.MatlabProxyFactory.getProxy(MatlabProxyFactory.java:81)
    at ShowImage.main(ShowImage.java:19)
Caused by: java.io.IOException: Cannot run program "matlab": CreateProcess error=2, The system cannot find the file specified
    at java.lang.ProcessBuilder.start(Unknown Source)
    at matlabcontrol.RemoteMatlabProxyFactory.createProcess(RemoteMatlabProxyFactory.java:292)
    ... 4 more
Caused by: java.io.IOException: CreateProcess error=2, The system cannot find the file specified
    at java.lang.ProcessImpl.create(Native Method)
    at java.lang.ProcessImpl.<init>(Unknown Source)
    at java.lang.ProcessImpl.start(Unknown Source)
    ... 6 more

I don't know what's the problem, any help will be appreciated!!

Community · Accepted Answer · 2017-05-23 12:30:36Z

1

I assume you are using the example from here. Obviously it is tested and working, just make sure that MATLAB is on the Windows path (the error message suggests that it cannot find the program "matlab.exe")

screenshot

edited May 23, 2017 at 12:30

CommunityBot

11 silver badge

answered Jun 29, 2012 at 11:25

Amro

125k25 gold badges250 silver badges466 bronze badges

Sign up to request clarification or add additional context in comments.

4 Comments

user1318251 Over a year ago

thank u very much :) now it's opening matlab from java , but do u know if i can pass image path to matlab from java via MatlabControl and vice versa or not ?? cause i'm making java GUI to match between two figures one i open on java GUI and another one output from matlb matching functions ,,,please if u can guide me a little bit in MatlabControl functions cause i'm new to it ,,,thanks again .

Amro Over a year ago

@user1318251: try passing the image name when you call your MATLAB function in the line: proxy.eval("myMatlabFunction('/path/to/image.png')");

user1318251 Over a year ago

i did what u told me but i got this error "Error using eval Undefined function 'hgr' for input arguments of type 'char' " and my matlab function is

user1318251 Over a year ago

can u help me here i asked new question about that stackoverflow.com/questions/11279998/…

Collectives™ on Stack Overflow

Exception in MatlabControl when running MATLAB function outside MATLAB

1 Answer 1

4 Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

4 Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related