title: Aligning matrices vertically as well as horizontally in LaTeX
body: <p>I'm trying to accomplish this in LaTeX:</p>
  
  <pre><code>⎡a⎤ ⎡b …  n⎤
  ⎢⁞⎢ ⎢⁞ ⋱ ⁞⎢
  ⎣x⎦ ⎣y …  z⎦
  
        [a  … x]
  </code></pre>
  
  <p>I'm able to get a vector + a matrix on one line, but I'm not sure how to align the vector below so that it sits perfectly under the large matrix. </p>
  
  <p>Here's a less-unicode text representation of the 'drawing' above:</p>
  
  <pre><code>[a] [ b c ]
  [d] [ e f ]
      [ g h ] 
  </code></pre>
  
  <p>Note that the last line ([ g h ]) is a single-row matrix, separate from the 2x2 matrix above it.</p>