Thanks a lot :)
That helped !
Alex



________________________________
 From: R. Michael Weylandt <michael.weylandt@gmail.com>

Cc: R help <R-help@r-project.org> 
Sent: Monday, March 26, 2012 4:48 PM
Subject: Re: [R] many curves to the same plot

You can use lines() with ecdf objects or use the
not-at-all-surprisingly-named add = TRUE parameter of curve().

Michael


> Dear all,
> I would like to plot under the same plot
> many curves like
>
> mycdf<-ecdf(runif(100))
> plot(mycdf)
> curve(mycdf,from=-1,to=1)
>
>
> mycdf<-ecdf(runif(200)+3)
> plot(mycdf)
> curve(mycdf,from=-1,to=1)
>
> as you can see each new call to curve redraws (erases) the window. How I can have an effect like
> plot(mycdf)
> lines(mycdf2)
> lines(mycdf3)
>
> I would like to thank you in advance for your help
>
> Regards
> Alex
>
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