Plotting questions (ROCR)

Thanks!
I am now also trying to plot several ROCs in the same figure using ROCR
package. The following code:

"pred1 <- prediction(yest1,ytest)
perf1 <- performance( pred1, "tpr", "fpr" )
plot( perf1 )
pred2 <- prediction(yest2,ytest)
perf2 <- performance( pred2, "tpr", "fpr" )
lines( perf2 )"

will result in error at "lines( perf2 )":

"Error in as.double(y) : ? cannot coerce type 'S4' to vector of type
'double'"

Is there any way to solve it?

Regards,




Richard Cotton wrote:

1. How to plot several lines in a figure? Suppose I have several sets of
points (xi,yi), where xi and yi are equal-length vector. plot(x1,y1)

will

give a line connecting these points. Another plot(x2,y2) will erase what
plot before and plot the new line. Can I have these lines all drawn in

the

same figure?

#Draw your plot
plot(seq(0,1,length.out=20))

#Add lines to the existing plot
lines(runif(20))

#Add points to the existing plot
points(runif(20), col="red")

2. How to open another figure window? Repeating plot will redraw in the

same

window instead of opening another one.

On Windows, windows() will open a new figure window; quartz() on Mac OSX
and x11() on Linux do the same.

Regards,
Richie.

Mathematical Sciences Unit
HSL



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