we must estimate g(x) and g'(x) (fit1 and fit2 below),</span>
0016 <span class="comment">% evaluate on a grid of points (p1 and p2), and apply the back-transformation.</span>
0017 <span class="comment">%</span>
0018 <span class="comment">% Disclaimer: I don't consider derivative estimation from noisy data</span>
0019 <span class="comment">% to be a well-defined problem. Use at your own risk.</span>
0020 <span class="comment">%</span>
0021 <span class="comment">% Author: Catherine Loader</span>
0022 <