[R] many curves to the same plot

[Petr PIKAL]

Hi

If you went through help page you probably could find it yourself in 
shorter time then you spend writing email and waited for others to write 
back.

see
?plot.stepfun

> 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)

Why curve? Isn't plot enough?

> 
> 
> mycdf<-ecdf(runif(200)+3)
> plot(mycdf)
> curve(mycdf,from=-1,to=1)

Actually the value for mycdf in required interval is zero. To see the line 
you need to extend x and not to redraw the plot is ensured by add=TRUE.

mycdf<-ecdf(runif(100))
plot(mycdf)
curve(mycdf,from=-1,to=4)
mycdf<-ecdf(runif(200)+3)
curve(mycdf,add=TRUE, from=-1,to=4, col=2)

Regards
Petr

> 
> 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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> 
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