如何刪除添加到圖例的傾斜線？還有黃色和灰色的點......它為什么會發(fā)生？
library(ggplot2) x <- seq(from = 1, to = 10, by = 1) df = data.frame(x=x, y=x^2, v=2*x) df2 = data.frame(x=x, y=x^2-5*x-10) ggplot(df, aes(x, y)) + geom_point(aes(size = v)) + theme_classic() + scale_size("blabla") + geom_point(data=df2, aes(x, y, color = "blue")) + geom_line(data=df2, aes(x, y, color = "blue")) + geom_hline(aes(color="gray",yintercept=25)) + geom_abline(aes(color="yellow", intercept=0, slope=1)) + scale_color_manual(values = c("blue","gray","yellow"), labels = c("nanana","hhh","abab"), name = "other")