From mboxrd@z Thu Jan  1 00:00:00 1970
From: Eric S Fraga <e.fraga@ucl.ac.uk>
Subject: Re: problem with ob-octave (matlab)
Date: Fri, 1 Apr 2016 16:49:15 +0100
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To: Uwe Brauer <oub@mat.ucm.es>
Cc: emacs-orgmode@gnu.org, John Kitchin <jkitchin@andrew.cmu.edu>

I don't have MATLAB on the system I'm on at the moment but trying your
(slightly modified) example with octave instead works:

#+begin_src org
  ,#+BEGIN_SRC octave :results output
    pkg load symbolic
    syms a b
    A=3D[a,b;b,a]
    eig(A)=20
  ,#+END_SRC

  ,#+results:
  ,#+begin_example
  OctSymPy v2.2.4: this is free software without warranty, see source.
  Initializing communication with SymPy using a popen2() pipe.
  Some output from the Python subprocess (pid 28058) might appear next.

  OctSymPy: Communication established.  SymPy v0.7.6.1.
  A =3D (sym 2=C3=972 matrix)

    =E2=8E=A1a  b=E2=8E=A4
    =E2=8E=A2    =E2=8E=A5
    =E2=8E=A3b  a=E2=8E=A6

  ans =3D (sym 2=C3=971 matrix)

    =E2=8E=A1       ____=E2=8E=A4
    =E2=8E=A2      =E2=95=B1  2 =E2=8E=A5
    =E2=8E=A2a - =E2=95=B2=E2=95=B1  b  =E2=8E=A5
    =E2=8E=A2           =E2=8E=A5
    =E2=8E=A2       ____=E2=8E=A5
    =E2=8E=A2      =E2=95=B1  2 =E2=8E=A5
    =E2=8E=A3a + =E2=95=B2=E2=95=B1  b  =E2=8E=A6


  ,#+end_example

#+end_src=20

I don't know if this helps you at all and/or whether the issue is with
MATLAB...

--=20
: Eric S Fraga (0xFFFCF67D), Emacs 25.0.92.1, Org release_8.3.4-668-g809a83