R-beta: Vertical segment.....

[Bensmail]

Hello,


I need to draw a vertical line on my plot, the uncertainty segment
(which is
a vertical segment on every point  of my plot so I can have an idea
about
the probability that  a point is misclassified.... clustering
problem.....)

I remember I have done it a long time ago in Splus using a function
called
"segment" to which we give the extrem point of the segment , I didn't
find
such function in R,  does it exist in R and if yes what is the name
please?


Thank you so much


Halima ,
The Netherlands

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