[R] Identify() : How to set the offset , or a reference

[allergen]

Hello,

I try to make several zoom in chosen region. 
So i use identify to indicate in which area to zoom.
i want o make it several time.
But once I zoom one time, the identify fonction gives bad results.

There is a short example, when i try to identify in Fnew  it sems that there
is an offset , or a bad reference. 
So the given result is "No point in 0,25inch"

thanks


F=read.table.....
>
x    y
1   3
2   5
....
3999   8
4000   9

plot(F$x,F$y)
I=identify(F$x)
Fnew=F[I[1]:I[2],]
>Fnew
x  y
2000  5
...
3000  9

plot(Fnew$x,Fnew$y)
I=identify(Fnew$x)






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