Please look at the labcurve function in the Hmisc package.  Here is one line
from the documentation of ?labcurve
  For automatic positioning of labels or keys, a curve is labeled at a point
that
  is maximally separated from all of the other curves.
As you, the documentation uses the same words you do.

If you don't have it yet:

install.packages("Hmisc")
library("Hmisc")
?labcurve

On Sat, Mar 12, 2011 at 5:12 PM, derek <jan.kacaba@gmail.com> wrote:

> Thank you for reply. I think, in script you posted, I have to manually add
> coordinates for label. I don't want do it manually. I would like to add
> labels at the points, where the lines are maximally separated. (points of
> maximum separation). Graphic representation of my data looks very similar
> to
> image I posted earlier. The legend is unnecessary, because each line
> represents same substance at different concentration. I would like to have
> the lines labeled with numeric value (e.g.. "0.9 mg/l", 0.8 mg/l)
>
> Example of my data in graph.txt file:
> V1  V2     V3     V4   V5   V6
> 200 0.100 200 0.110 200  0.120
> 210 0.130 210 0.150 210  0.170
> 230 0.100 230 0.100 230  0.120
>
> odd numbered columns (e.g.. V1) represents x axis
> even numbered columns (e.g.. V2) represents y axis
>
> Package hmisc and function labcurve should do trick, but I barely
> understand
> from manual how to do it.
> Probably something like this:
>
> graph=read.table("graph.txt",header =FALSE,sep = "", dec = ",",fileEncoding
> = "",
> > encoding = "unknown", skip=19,nrows=400)
> > attach(graf)
> a=data.frame(V1,V2)
> b=data.frame(V3,V4)
> c=data.frame(V5,V6)
>
> label(a) <- 0.1 mg/l
> label(c) <- 0.2 mg/l
> label(c) <- 0.3 mg/l
>
>
>
>
> --
> View this message in context:
> http://r.789695.n4.nabble.com/how-to-label-lines-tp3350452p3350942.html
> Sent from the R help mailing list archive at Nabble.com.
>
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> PLEASE do read the posting guide
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>

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