title: Matrix multiply two lists with a formula
body: <p>If I have two lists in Excel:</p>
  
  <pre>
  X : x1  x2  x3
  Y : y1  y2  y3</pre>
  
  <p>How can I make a 2-dimensional matrix like this?:</p>
  
  <pre>
  x1*y1  x1*y2  x1*y3
  x2*y1  x2*y2  x2*y3
  x3*y1  x3*y2  x3*y3</pre>