[R] unable to interactively label curves on a plot

Frank E Harrell Jr f.harrell at vanderbilt.edu
Sat Oct 20 18:20:53 CEST 2007

Quin Wills wrote:
> Hello all
> Simple question for the gurus. I'm trying to interactively label curves 
> on a single plot. The labcurve() function from Hmisc seems like the way 
> to do this (?). I just can't seem to get it to work. Toy example:
>  > x <- 1:10
>  > y1 <- x^2
>  > y2 <- 2*x
>  > plot(x,y1)
>  > lines(x,y2)
>  > labcurve(labels=c("curve1", "curve2"), method="locator")
>  From the help file, this is how I would understand it should be done, 
> but have tried many other combinations, with no luck.
> Running up-to-date R, R packages and Fedora.
> Many thanks,
> Quin

Please take time to read the help file for labcurve which makes it clear 
that you need to give it the data as well as the curve labels.  Also 
specify pl=TRUE.

Frank E Harrell Jr   Professor and Chair           School of Medicine
                      Department of Biostatistics   Vanderbilt University

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