title: Scale a series between two points
body: <p>How do I scale a series such that the first number in the series is 0 and last number is 1. I looked into 'approx', 'scale' but they do not achieve this objective.</p>
  
  <pre><code># generate series from exponential distr
  s = sort(rexp(100))
  
  # scale/interpolate 's' such that it starts at 0 and ends at 1?
  # approx(s)
  # scale(s)
  </code></pre>