如何改变R中图中特定点的形状

Question

如何更改R图中特定点的形状？我有一个有四个点的情节，我想在下图中改变两个点(0, 0.4991)和(1, 1.2258)的形状：

x = c(0,0,1,1,1)
y = c(0.4991,1.1423,1.2258,1.158,0.5148)
dat<-cbind(x,y)

myTicks<-c(0,1)
plot(dat[,1],dat[,2], yaxt="n", xaxt="n", xlab="", ylab="")
abline(0.4991,0.7267)
abline(1.1423,0.0157)
abline(0.4991,0.0157,lty=2)
axis(side = 1, at = myTicks)
axis(side = 2, at = myTicks)

Answer 1

您可以使用13.1220000000000000000000000000000007897688 参数指定形状，该参数接受矢量，例如

pch