Error problem with evalString

Hello, I have a problem. I have a double matrix in java, when I pass it to matlab for some calculs I got this error : cannot get array res for matlab workspace. Can you help me please?

The java code:

        double [][]m1={{1, 2, 3},{4, 5, 6}};
        double [][]m2={{1, 2, 3},{1, 2, 3}};
        JMatLink engine1 = new JMatLink();
        engine1.engOpen();
        engine1.engOutputBuffer();
        engine1.engEvalString("res=fproductMatrix("+m1+","+m2+");");
        System.out.println("read output buffer of matlab ");
        double [][] produit= engine1.engGetArray("res");
        engine1.engClose();

Knowing that fproductMatrix (.m file ) is a matlab function which return the product of two matrix. Thank you in advance.

Answer 1

[Samuel Gray]

I don't see any documentation that says that evalstring needs a buffer. I'd try running it with setvisible and without engoutputbuffer just to see what happens without having to pass the text back. Then run it before and after configuring the output buffer, at least in C you can't just call it without some parameters to indicate the buffer size and the termination location.