how to draw a vertical line from points to x-axis

I think you want the ?lines function.

To connect a point (x,y) to the x-axis,

lines(x=c(x,x),y=c(y,0))

...draws a line from that point to the x-axis. You may also want to specify
pch=c(?,""),type="b" where ? is the original point type (which you don't
want to "run over") and "" is the pch for theline on the axis.

--Adam

Hello,

I want to know how to draw a line connecting each point to the x-axis
perpendicularly (i.e. a vertical line).
abline(v=...) seems not to work for my purpose, because it runs over the
data point. Can anyone help? Thanks.

Anny

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