title: Create a matrix with vector (not scalar) elements
body: <p>I want to create an object like a matrix with vectors for its elements. like:</p>
  <p>(1,2,3)    (1,3,6)    (2,4,1)</p>
  <p>(0,7,8)    (2,3,4)    (5,2,1)</p>
  <p>(9,0,8)    (8,4,6)    (1,1,1)</p>
  <p>What should I do?</p>