[R] how to create ROC curve for 2 dimensional classifiers

[Waverley]

Hi,

I understand for 1 d classifiers, you can use ROCR package.

Is there a package you can plot ROC curve for 2d classifiers?  One of
my colleagues asked me about this.  I have been quite puzzled,
conceptually, how you can do the ROC curve for 2d classifiers.  Can
someone share his/her knowledge or experience?

Thanks in advance.

-- 
Waverley @ Palo Alto