title: Matplotlib continuing line into infinity
body: <p>I have a graph, made from data in .txt files. Currently, Matplotlib will graph it to the last point in my file. I need it to continue farther that that. I seem to remember something somewhere saying that I could make a line continue into infinity. (I don't mean infinity when using calculus and limits, I just mean a line going of the screen, until the edge of the graph.)</p>
  
  <p>Now, I know this would not be accurate if I had a curved graph, because the line would continue forever at the angle out of the last datapoint. However, since I have a straight-line graph, this would be ideal. </p>
  
  <p>Does anyone know if this is possible and if so, how? I have done research, and cannot remember where I saw the doc entry saying I could do this, so if someone could shed light on this I'd really appreciate it.</p>