title: unique values in array count
body: <p>I have an array like the following</p>
  
  <pre><code>var data = [
              ["1"," 101_30.1.101_34","0.0200112629","mm/s","[OK]"],
              ["1"," 101_30.1.101_35","0.0146548533","mm/s","[OK]"],
              ["1"," 101_30.1.101_45","0.0146548533","mm/s","[OK]"],
              ["1"," 101_42.2.101_43","0.0101406257","mm/s","[OK]"],
              ["2"," 102_17.3.102_38","5.1719756","mm/s","[WA]"],
              ["2"," 102_17.3.102_39","3.5886707","mm/s","[WA]"],
              ["2"," 102_17.3.102_44","9.4615074E-4","mm/s","[OK]"],
              ["2"," 102_40.4.102_41","4.8159785","mm/s","[OK]"],
              ["3"," 204_15","3.8374166","mA","[OK]"],
              ["4"," 501_11","1027.5156","RPM","[WA]"]
             ]
  </code></pre>
  
  <p>What im trying to do is find how many unique array there are. Example 1=4,2=4,3=1,4=1</p>
  
  <p>The data is coming from a database, so the number of arrays can always change.</p>
  
  <p>Here is a simple jsfiddle of what im talking about <a href="http://jsfiddle.net/mariob316/xDfay/" rel="nofollow">JsFiddle</a></p>