[R] plot xy data with error bars
Petr Pikal
petr.pikal at precheza.cz
Thu May 25 08:30:17 CEST 2006
Hi
On 25 May 2006 at 1:08, Tibi Codilean wrote:
Date sent: Thu, 25 May 2006 01:08:20 +0100
From: "Tibi Codilean" <Tibi.Codilean at ges.gla.ac.uk>
To: r-help at stat.math.ethz.ch
Subject: [R] plot xy data with error bars
> Dear All,
>
> I have x,y data with errors associated with both x and y. What would
> be the easiest way of creating plots with both x and y error bars?
I know there is some function(s) in some package(s) for error bar
plotting but if you want to use your own, use arrows
A<-data.frame(x=1:10, y=1:10, erx=rnorm(10)^2, ery=rnorm(10)^2)
plot(x,y)
arrows(x,y,x+erx/10,y, angle=90, length=.1)
arrows(x,y,x-erx/10,y, angle=90, length=.1)
arrows(x,y,x,y-ery/10, angle=90, length=.1)
arrows(x,y,x,y+ery/10, angle=90, length=.1)
HTH
Petr
>
>
> Thanks
>
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Petr Pikal
petr.pikal at precheza.cz
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