求助r高手：如何画两条正态密度曲线图在一起有交叉

是 否 +2 论坛币

k人 参与回答

经管之家送您一份

应届毕业生专属福利!

求职就业群

赵安豆老师微信：zhaoandou666

经管之家联合CDA

送您一个全额奖学金名额~ !

立即领取

感谢您参与论坛问题回答

经管之家送您两个论坛币！

+2 论坛币

如下图

扫码加我 拉你入群

请注明：姓名-公司-职位

以便审核进群资格，未注明则拒绝

分享0 收藏4 回帖

关键词：曲线图 在一起 如何 曲线图

1. xdnorm <- function(x) {
   
2.   return(dnorm(x, mean = 3))
   
3. }
   
4. plot(dnorm, from = -3, to = 6, ylab = "Freq")
   
5. plot(xdnorm, from = -3, to =6, add = TRUE)
   
6. vec <- seq(-3, 6, by = 0.05)
   
7. polygon(vec, pmin(xdnorm(vec), dnorm(vec)), col = "grey")

复制代码

cheetahfly 发表于 2016-12-14 22:08

多谢指导回复！
能不能把这个图修改一下画成我附件图片的样子？也就是需要将两条曲线相交下面的阴影部分分成两部分并标注出来、天上两条密度曲线的均值点mu、加上两条曲线代表的G1和G2？谢谢！

1. library(graphics)
   
2. xdnorm <- function(x) {return(dnorm(x, mean = 3)) }
   
3. plot(dnorm, from = -3, to = 6, ylab = "Freq", ylim = c(0, 0.45))
   
4. plot(xdnorm, from = -3, to =6, add = TRUE)
   
5. vec1 <- seq(-3, 1.5, by = 0.05)
   
6. vec2 <- seq(1.5, 6, by = 0.05)
   
7. polygon(c(vec1, 1.5), c(xdnorm(vec1), 0), col = "grey50")
   
8. polygon(c(1.5, vec2), c(0, dnorm(vec2)), col = "grey70")
   
9. segments(0, 0, 0, dnorm(0), lty = 3, lwd = 2)
   
10. segments(3, 0, 3, xdnorm(3), lty = 3, lwd = 2)
    
11. text(x = 0, y = 0.42, labels = "G1")
    
12. text(x = 3, y = 0.42, labels = "G2")
    
13. text(x = 0, y = -0.01, labels = "Mu1")
    
14. text(x = 3, y = -0.01, labels = "Mu2")

复制代码