[R] how to draw a vertical line from points to x-axis

Adam D. I. Kramer adik-rhelp at ilovebacon.org
Tue Sep 9 00:27:16 CEST 2008

I think you want the ?lines function.

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


...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.


On Sun, 7 Sep 2008, Anny Huang wrote:

> 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
> 	[[alternative HTML version deleted]]
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