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

[Tirthadeep]

>library(ROCR)

>plot(roc1)
>plot(roc2)

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

>plot(roc1)
>points(roc2)
   Error in as.vector(x, "double") : cannot coerce to vector

any solution?
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