title: retrieve values from interpolation object
body: <p>I am doing interpolation using scipy</p>
  
  <pre><code>import scipy.interpolate
  x = np.arange(0, 10)
  y = np.exp(-x/3.0)
  f = sp.interpolate.interp1d(x, y)
  </code></pre>
  
  <p>here, I am gettng f as object. but, what If I need values of that object f?
  how can I retrieve values from that interpolation object?</p>