[R] help on ploting various lines

[Baoqiang Cao]

Dear All,

I tried to plot a variety of lines(curves) on same figure. What I did is,
plot(x=x1,y=y1)
lines(x=x2,y=y2)
lines(x=x3,y=y3)
...

In my data, the maximum of y1 is much smaller than those maximums of other y vectors. So, in the figure I got, there are some curves which are not complete, I mean, they were cut off at the maximum of y1 at the y axis. Could anybody point out some right commands I need use? Thanks!

Best,
 Cao