IOanna,

If you are trying to distinguish between the type="b" and the type="o" in
the legend, there does not appear to be a way to do this with the legend()
function in base.  I found a similar question posted on stackoverflow, and
they suggested a work around for something similar (but not quite the same).
http://stackoverflow.com/questions/18233236/how-to-get-lines-of-type-b-in-a-legend
Here's an example, using your data.

X1<-c(0,1,2,3,4)
Y1<-c(0,1,2,3,4)
Y2<-c(5,6,7,8,9)
Y3<-c(32,33,34,35,36)

plot(X1,Y3,pch=20, ylim=range(Y1, Y2, Y3))
lines(X1,Y1,lty=1,type='o')
lines(X1,Y2,lty=1,type='o', pch=21, bg="white")
lines(X1,Y3,lty=2)
legend("center", c("Y3", "Y2", "Y1"), lty=c(2, 1, 1), pch=c(20, 21, 1),
pt.bg=c(NULL, "white", NULL))

Jean



On Wed, May 28, 2014 at 3:21 AM, IOANNA <ii54250@msn.com> wrote:

>
>
> Hello all,
>
>
>
> I want to plot the legend for the following two lines:
>
> I have two lines:
>
>
>
> X1<-c(0,1,2,3,4)
>
> Y1<-c(0,1,2,3,4)
>
>
>
> Y2<-c(5,6,7,8,9)
>
>
>
> Y3<-(32,33,34,35,36)
>
>
>
> plot(X1,Y3,pch=20)
>
> lines(X1,Y1,lty=1,type='o')
>
> lines(X1,Y2,lty=1,type='b')
>
> lines(X1,Y3,lty=2)
>
>
>
> Any ideas how?
>
>
>
> Best
>
> IOanna
>
>
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>
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