title: Ruby Find by column and row in a multidimensional array
body: <p>So here is what my array looks like</p>
  
  <pre><code>[["Date", "Patient 1", "Patient 2", "Patient 3"],
  ["8/1/2014",0,0,0]
  ["8/2/2014",0,0,0]
  ["8/3/2014",0,0,0]]
  </code></pre>
  
  <p>I need to be able to find the index for "Patient 2" - "8/2/2014" which would of course be array[2][2] so that I can then change it's value from 0 to something else. How do I find that using the column and row names I've layed out?</p>
  
  <p>Many thanks.</p>