小编Ali*_*ice的帖子

gb <- read.csv('results-gradient-boosting.csv')
p <- ggplot(gb) + geom_point(aes(x = pred, y = y),alpha = 0.4, fill = 'darkgrey', size = 2) + 
geom_line(aes(x = pred, y = pred,color = 'darkgrey'),size = 0.6) + 
geom_line(aes(x = pred, y = pred + 3,color = I("darkgrey")), linetype = 'dashed',size = 0.6) + 
geom_line(aes(x = pred, y = pred -3,color = 'darkgrey'),linetype = 'dashed',size = 0.6)

我的代码在上面.我不知道为什么当我把颜色放在aes里面时,颜色变成了红色.但如果我把它放在aes之外,那是正确的.谢谢你的帮助!