title: Extract only one spike from matlab plot
body: <p>I have a matlab plot between two matrices (129 by 1), I just want to extract the only first spike from the multiple spikes as seen in plot. I am newbie to Matlab. </p>
  
  <p><img src="https://i.stack.imgur.com/qxG4U.png" alt="enter image description here"></p>
  
  <p>-John</p>