title: How do you use CPScatterPlotInterpolationLinear?
body: <p>I just happened to stumble across "CPScatterPlotInterpolationLinear" via google search for 'interpolation'.</p>
  
  <p>Does this mean that I could plug gaps of scatter/linear data via interpolation?
  I had asked a similar question earlier and was told that <a href="https://stackoverflow.com/questions/12662898/can-how-core-plot-extrapolate-scatter-points-to-fit-fixed-labeling-policy">CP doesn't add points to a graph</a>.</p>
  
  <p>I attempted to create a 6-month fixed-interval scatter plot by creating an array of 180 elements for 180 days/6 months.  The missing data/day were filled with [NSNull null] objects... but CP merely plots the non-nulls without the interpolation.</p>
  
  <p>The 'CPScatterPlotInterpolationLinear' enum got me to re-think.   </p>
  
  <p><strong>Question:</strong> How do I employ 'CPScatterPlotInterpolationLinear' to interpolate missing data on a graph?  ... no need to actually add data points, just 'connect the dots'.</p>