[R] Plot ROC using TP,FP AND FN alone

[vjyns]

Hi,

   I want to plot ROC curve for my detection algorithm which is used to
detect features
in image. I had obtained true positive, false positive and false negative
from 
the algorithm. There is no true negative in my case. 

       I had run the algorithm for 6 images so i got 6 number of TP,FP and
FN. With
this how can i plot the ROC curve. 
http://r.789695.n4.nabble.com/file/n4640390/Picture2.jpg 
 
     Help and suggestion is needed in this regard to plot ROC with this
data. 

     I am new to R. i had downloaded ROCR, but dont know how to use it and
plot the required plot.



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