R语言plot（ROC）函数中，定义x与y的长度相同，且都为0-100。告诉R代码。

Sure, here is the R code for creating a ROC plot using the plot() function in R:

# Sample data
set.seed(123)
x <- runif(100)*100
y <- runif(100)*100
class <- ifelse(x+y > 125, 1, 0)

# Creating ROC curve
library(pROC)
roc_obj <- roc(class, x)  # x is predictor variable
roc_data <- coords(roc_obj, "all")   # get coordinates of ROC curve

# Plotting ROC curve
plot(roc_data[,1], roc_data[,2], type = "l", xlab = "False Positive Rate", ylab = "True Positive Rate", main = "ROC Curve")

This will create an ROC plot with x and y axes ranging from 0 to 1. If you want to change the axis ranges to 0-100, you can use the `ylim` and `xlim` arguments as follows:

plot(roc_data[,1]*100, roc_data[,2]*100, type = "l", xlab = "False Positive Rate (%)", ylab = "True Positive Rate (%)", 
     main = "ROC Curve", xlim = c(0, 100), ylim = c(0, 100))