[R] How to draw several ROC curves on a common graph

From: Tirthadeep <sabya231_at_gmail.com>
Date: Wed, 20 Jun 2007 09:42:16 -0700 (PDT)



gives two plots on two different graph. Now i want to merge on a single graph.


   Error in as.vector(x, "double") : cannot coerce to vector

any solution?

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