DD_tools: plotroc

PLOTROC Draw an ROC curve

     H = PLOTROC(W,A)
     H = PLOTROC(E)

 Plot the roc curve of E according to the 'traditional' way: on the x
 axis we put the false positive (outliers accepted) and on the y axis
 we put the true positive (targets accepted).

 By supplying W and A explicitly, you get some added functionality, in
 the sense that you can change the operating point and retrieve the new
 classifier. You can retrieve the classifier using GETROCW:

   a = oc_set(gendatb,'1');
   w = gauss_dd(a,0.1);
   h = plotroc(w,a);
   % Move the operating point over the ROC curve and click on the
   % desired position. Then type:
   w2 = getrocw(h);

 The mapping w2 now contains the same classifier w, only with a changed
 operating point.

     H = PLOTROC(W,A,LINESTYLE)
     H = PLOTROC(E,LINESTYLE)

 When required, a third (second) argument can be given, indicating the
 color, LINESTYLE and markers of the plot. See 'plot' for the
 possibilities.

 Finally, PLOTROC is also capable of plotting a precision-recall curve.

See also: dd_error dd_roc dd_prc dd_auc getrocw 



Copyright: D.M.J. Tax, D.M.J.Tax@prtools.org
Faculty EWI, Delft University of Technology
P.O. Box 5031, 2600 GA Delft, The Netherlands