R画图

R画图

1.一幅图中多条线
方法一 用lines、points函数
超实用画图

方法二
在第二个plot函数中添加参数 add=T

plot(performance(pred1, "tpr", "fpr"), col="red", lwd = 1.5, main = "ROC Curves",lty=1,pch=15)
plot(performance(pred2, "tpr", "fpr"), add = T, col = "blue", lwd = 1.5,lty=1,pch=16)
plot(performance(pred3, "tpr", "fpr"), add = T, col = "green", lwd = 1.5,lty=1,pch=17)

2.添加图例
legend（）函数

legend(0.6,0.3,c("logit full model","logit aic model","logit bic model"),
                 lty=1,cex = 0.8,pch=c(15:17),text.col = c("red","blue","green"))

数字0.6，0.3表示左边、上边的边界
c(“logit full model”,“logit aic model”,“logit bic model”) 标签
lty 线条类型
cex 字体大小
pch 散点样式
text.col 文本颜色