I am investigating the REC (regression error characteristic)curve, and I am using R to write the code implementing the R

[answerhappygod]

I am investigating the REC (regression error
characteristic)curve, and I am using R to write the code
implementing the REC so that I can use it to compare different
models.
For example, Data set is called "ff", split into "ff.train",
"ff.test". I have the SVM fit using data inside ff.train ,
lets call it "svm.fit". Now, I want to draw the REC curve of
model "svm.fit" in RStudio, but I can't find any package or
self-created function that is working.
Can you give the R code of implementing the REC curve plot?