title: coefficients of spline interpolation in scipy
body: <p>I want to calculate the coefficients of a spline interpolation by scipy. 
  In MATLAB:</p>
  
  <pre><code>x=[0:3];
  y=[0,1,4,0];
  spl=spline(x,y);
  disp(spl.coefs);
  </code></pre>
  
  <p>and it will return: </p>
  
  <pre><code>ans =
  
     -1.5000    5.5000   -3.0000         0
     -1.5000    1.0000    3.5000    1.0000
     -1.5000   -3.5000    1.0000    4.0000
  </code></pre>
  
  <p>But i can't do that by interpolate.splrep in scipy. Can you tell me how to calc it?</p>