title: Plot against time of format "hh:mm:ss" in MATLAB?
body: <p>I have a bunch of time-indexed data, that I have to plot with MATLAB.</p>
  
  <p>The current format of the time is as follows</p>
  
  <pre><code>23:55:42,-147928.686833054
  23:55:43,-147928.404621219
  23:55:44,-147928.219419702
  23:55:45,-147928.395802099
  23:55:46,-147928.492812417
  23:55:47,-147928.413440339
  23:55:48,-147928.386982979
  </code></pre>
  
  <p>I simply wish to plot the second column, the values, against the first column, the time.</p>
  
  <p>I can of course take the first time point as 0, and next as 1, ..., and so on. However, I wish to stick with the original timing.</p>
  
  <p>How may I deal with this type of time handily?</p>