title: plt.plot meaning of [:,0] and [:,1]
body: <p>I am plotting a graph using plt.plot using information found online.</p>
  
  <p>However, I do not know what the y[:,0] means:</p>
  
  <pre><code>    plt.plot(t, y[:,0], label= 'active Mos') 
  </code></pre>
  
  <p>Similarly, I see y[:,1] a lot too...</p>
  
  <p>plt.plot is to plot a line to the graph, right? </p>