title: scipy PchipInterpolator implementation problems
body: <p>I am trying to implement PchipInterpolator based on the link:</p>
  
  <p><a href="http://docs.scipy.org/doc/scipy-0.14.0/reference/generated/scipy.interpolate.PchipInterpolator.html" rel="nofollow">http://docs.scipy.org/doc/scipy-0.14.0/reference/generated/scipy.interpolate.PchipInterpolator.html</a></p>
  
  <p>The code I am using is:</p>
  
  <pre><code>x = np.arange(0, 10)
  y = np.exp(-x/3.0)
  set_interp  =   scipy.interpolate.PchipInterpolator( x, y, extrapolate=True )
  </code></pre>
  
  <p>I get the error as:</p>
  
  <pre><code>TypeError: __init__() got an unexpected keyword argument 'extrapolate'
  </code></pre>
  
  <p>So, obviously I am implementing it the wrong way. I have tried numerous other ways to implement extrapolate but it fails.</p>