title: Data interpolation in python
body: <p>I have four one dimensional lists: X1, Y1, X2, Y2. </p>
  
  <ul>
  <li>X1 and Y1 each have 203 data points. </li>
  <li>X2 and Y2 each have 1532 data points. </li>
  <li>X1 and X2 are at different intervals, but both measure time. </li>
  </ul>
  
  <p>I want to graph Y1 vs Y2.</p>
  
  <p>I can plot just fine once I get the interpolated data, but can't think of how to interpolate data. I've thought and researched this a couple hours, and just can't figure it out. I don't mind a linear interpolation, but just can't figure out a way. </p>