[R] color under lm line

[Dieter Menne]

Marlin Keith Cox wrote:
> 
> Thank you, but I need only the area under the llm colored.  What if there
> were two lm lines? 
> 
For the well-behaved case  you could find the range to be colored with

range = which(diff(resid(llm)>0)!=0)

Dieter

x=seq(0,5,len=100)
y=-(x-5)^2
llm<-lm(y~x)
range = which(diff(resid(llm)>0)!=0)
co <- coef(llm)
bord <- pmin(y, co[1] + co[2] * x)
plot(x,y)
r1 = range[1]
r2 = range[2]
polygon(c(x[r1],x[r1],x[r2],x[r2]),
        c(min(y),y[r1],y[r2],min(y)),
        col = 'red')
abline(co)



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