title: How to plot a graph of 3 lines, where one vector holds the y axis and a 3 by X matrix holds the values of the 3 lines?
body: <p>Sorry for the simplicity of the question.  New to Matlab and despite its thorough documentation, can't find this.</p>
  
  <p>I have a vector <code>y_axis</code> that has all of the sequential values for my y-axis. It is 400x1.  I also have a matrix <code>data</code> where each column holds the corresponding x-axis values.  It is 400x3.  </p>
  
  <p>I want to plot a line graph based on this data, but can't figure out how.</p>