[R] Colour area under density curve

[Peter Alspach]

Tena koe David

?polygon

should help you.

HTH ....

Peter Alspach

> -----Original Message-----
> From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-
> project.org] On Behalf Of David Hervas Marin
> Sent: Thursday, 27 January 2011 12:02 p.m.
> To: R-Help
> Subject: [R] Colour area under density curve
> 
> Hello,
> 
> I have this code to plot a certain normal distribution and represent
> the pnorm value for a certain "x":
> 
> 
> x<-300
> xx <- seq(2.5,7.5, by=0.1)
> yy <- dnorm(xx,5.01,0.77)
> d<-signif(pnorm(log(x), 5.01,0.77),4)
> xpts <- round(exp(0:8))
> par(bg = "antiquewhite")
> plot(xx,yy, type="l", col="blue", lwd=2, xaxt="n",
> xlab=expression(ufc/m^3),
> ylab="Densidad")
> axis(1, at=log(xpts, base=exp(1)), lab=xpts)
> n<-0
> for (i in 1:(dnorm(log(x), 5.01,0.77)/0.005)){
> n<-n+0.005
> points(log(x), n, pch=16, cex=0.3)}
> points(log(x),-0.01,pch=24,cex=2,bg='RED')
> text(log(x)+0.4, 0.004, paste(d*100, "%"))
> 
> I'd like to colour the area under the curve left to my "x". Is there
> any way?
> 
> Thanks in advance
> 
> 
> _____________________
> David Hervás Marín
> 
> 
> 
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