[英]Coloring 3 regions of a plot in R
可能有几种方法,但polygon
很好:
plot(NA, xlim=c(0,65), ylim=c(0,11))
pusr <- par("usr")
f <- function(x,peak_x=10,peak_y=11,coef=.004) coef*-(x-peak_x)^2+peak_y
x <- seq(pusr[1], 100, length.out=50)
rect(pusr[1], pusr[3], pusr[2], pusr[4], col="blue")
polygon(c(x, pusr[1]), f(c(x, pusr[2]), peak_x=10, peak_y=11, coef=0.003), col="green")
polygon(c(x, pusr[1]), f(c(x, pusr[2]), peak_x=10, peak_y=6, coef=0.004), col="red")
box()
可以使用以下方法获得正确答案:
a <- curve(f,-3,65,ylim=c(0,12),xaxs="i",yaxs="i")
pusr <- par("usr")
rect(pusr[1], pusr[3], pusr[2], pusr[4], col=2,border = 1)
b <- curve(f(x, peak_y = 6,coef = .003),-3,65,add=TRUE,col=2)
polygon(c(-3,a$x,63),c(0,a$y,f(63)),col="yellow")
polygon(c(-3,b$x,54),c(-3,b$y,f(55, peak_y = 6,coef = .003)),col=3)
box()
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.