How can I plot this graph

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Try this:

matplot(xxx[,1], xxx[2:4], type = "l")
with(xxx, {
	segments(x, z1, x, z2)
	points(x, z1)
	points(x, z2)
})

Omit the two points commands if you don't want circles at the ends of
the segments.
Hi,

I am having trouble plotting the graph I need given the follow kind of data

xxx <- data.frame(
              "x"=c(1,2,3,4,5),
              "y1"=c(2,4,3,5,6),
              "y2"=c(3,4,6,3,1),
              "y3"=c(1,3,5,7,3),
              "z1"=c(1,NA,3,5,NA),
              "z2"=c(2,NA,4,6,NA) )
xxx
 x y1 y2 y3 z1 z2
1 1  2  3  1  1  2
2 2  4  4  3 NA NA
3 3  3  6  5  3  4
4 4  5  3  7  5  6
5 5  6  1  3 NA NA

What I need is the following

- One graph
- y1, y2, y3 plotted as seperate lines vs x
- z1, z2 give the range of the value of z, and need to be plotted as error bars or confidence intervals vs x

Many thanks for any help,
Regards,
David

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What I need is the following

- One graph 
- y1, y2, y3 plotted as seperate lines vs x
- z1, z2 give the range of the value of z, and need to be plotted as error bars or confidence intervals vs x

This doesn't look right to me, but it might give you a start:

library(plotrix)
brkdn.plot(c("y1","y2","y3"),NA,"x",xxx,
  dispbar=FALSE,col=2:4,ylim=c(-3,10))
dispbars(xxx$x,xxx$y1,xxx$z1,col=2)
dispbars(xxx$x-0.12,xxx$y2,xxx$z2,col=3)

Jim