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

Peter Alspach PAlspach at hortresearch.co.nz
Sun Sep 7 23:10:14 CEST 2008


Here's one way:

plot(0:10, 0:10, pch=16)
lines(rep(0:10, each=3), t(matrix(c(0:10, rep(c(0,NA), each=11)),

HTH ....

Peter Alspach

> -----Original Message-----
> From: r-help-bounces at r-project.org 
> [mailto:r-help-bounces at r-project.org] On Behalf Of Anny Huang
> Sent: Monday, 8 September 2008 8:49 a.m.
> To: r-help at r-project.org
> Subject: [R] how to draw a vertical line from points to x-axis
> 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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