title: Reset ColorOrder index for plotting in Matlab / Octave
body: <p>I have matrices <code>x1, x2, ...</code> containing <strong>variable</strong> number of row vectors.
  I do successive plots</p>
  
  <pre><code>figure
  hold all % or hold on
  plot(x1')
  plot(x2')
  plot(x3')
  </code></pre>
  
  <p>Matlab or octave normally iterates through <code>ColorOrder</code> and plot each line in different color. <strong>But I want each <code>plot</code> command to start again with the first color in colororder</strong>, so in default case the first vector from matrix should be blue, second in green, third in red etc. </p>
  
  <p>Unfortunately I cannot find any property related to the color index niether another method to reset it.</p>