This is not enough information to let us give a good example but perhaps ?lines
or ?points might help?
Example
aa <- 1:5
bb <- 1:5
cc <- c(1.5,2.5,3.5,4.2,4.4)
plot(aa,bb)
lines(aa,cc,col='red')
points(aa,cc, col="blue")
--- On Sat, 5/22/10, khazaei at ceremade.dauphine.fr <khazaei at
ceremade.dauphine.fr> wrote:
> From: khazaei at ceremade.dauphine.fr <khazaei at
ceremade.dauphine.fr>
> Subject: [R] question about graph
> To: r-help at r-project.org
> Received: Saturday, May 22, 2010, 5:53 AM
> Hi,
>
>
> I have two different sets of data from two different
> populations. I want
> to plot these samples (for example: Line graph) by just one
> graph.
> could you please help me?
>
> Thanks
> Khazaei
>
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