title: How to transpose a sympy matrix
body: <p>I have a problem using the sympy library.
  I want to transpose a matrix but it does not work. My code is </p>
  
  <pre><code>x = Symbol('x')
  y = Symbol('y')
  
  J = Matrix([[1+x,2+y,3*x],[4*x,5+x,6*y],[7+y,8*y,9+x]])
  
  
  Jtrans = Transpose(J)
  
  print(J)
  print(Jtrans)
  </code></pre>
  
  <p>Any suggestions?</p>