or 2-d predictors, use contour instead of surf.</span>
0017 <span class="comment">%   'direct'  - fit directly, instead of using interpolation</span>
0018 <span class="comment">%               (see the predict() function).</span>
0019 <span class="comment">%   'what'    - locfit what argument ('coef', 'infl', 'vari', 'band' etc).</span>
0020 <span class="comment">%   Any additional arguments are passed to Matlab's plot(), contour()</span>
0021 <span class="comment">%     or surf() function as appropria