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Symbolic package and solving multiple variables

From: RT
Subject: Symbolic package and solving multiple variables
Date: Tue, 11 Jul 2017 18:31:38 -0400

I know the symbolic package isn't the same as matlab but this error confuses me and I'm not sure what causes this
What I type in to test it

pkg load symbolic
syms x y
sol = solve([x^2+y^2==20,y==x^2,x>0,y>0],[x,y])

I should get x=2 and y=4

but I get this instead

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 20298) might appear next.
Python 2.7.12 (default, Nov 19 2016, 06:48:10)
[GCC 5.4.0 20160609] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> >>> Traceback (most recent call last):
  File "<stdin>", line 26, in <module>
  File "<stdin>", line 6, in _fcn
  File "/usr/lib/python2.7/dist-packages/sympy/matrices/", line 3084, in __getattr__
    "%s has no attribute %s." % (self.__class__.__name__, attr))
AttributeError: MutableDenseMatrix has no attribute is_Relational.

OctSymPy: Communication established.  SymPy v0.7.6.1.
PYTHON: Error in cmd
Resetting the octsympy communication mechanism
Closing the Python pipe...
error: python_cmd: unexpected return
error: called from
    python_cmd at line 144 column 6
    solve at line 135 column 9

I'm trying to create a function when given two points it comes back with the exponential equation see link of image below

I'm use Octave 4.0 Ubuntu 16.04 64bit
symbolic *|   2.2.4 | /usr/share/octave/packages/symbolic-2.2.4  (from Ubuntu repos)

Any ideas how to get this to work should I not use the symbolic package?

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