Thanks Jorge and Marc,

I drew the line using the function:

segments(x0, y0, x1, y1)

Lesandro

  ________________________________________________________________________

--- Em qui, 25/6/09, Marc Schwartz <marc_schwartz@me.com> escreveu:

De: Marc Schwartz <marc_schwartz@me.com>
Assunto: Re: [R] How to draw a line in plot when I know the start point(x1, y1) and end point(x2, y2)?

Cc: r-help@r-project.org
Data: Quinta-feira, 25 de Junho de 2009, 15:38

On Jun 25, 2009, at 1:30 PM, Lesandro wrote:

> Hello all,
> 
> How to
 draw a line in plot when I know the start point(x1,y1) and end point(x2,y2)? I need make this as additional information in the graph:
> 
> plot(wl2[[1]],wl2[[2]])
> 
> I think that is possible make this with the function abline(), is possible? I looked the function lines() too, but don't understand as make.
> 
> 
> Thanks!
> Lesandro


See ?segments which does just what you are looking for.

lines() is more designed for a series of connected lines (eg. a polygon) rather than a single line segment.

abline() can draw a straight line, at a given vertical or horizontal position, or if given a linear model object, the fitted line.

HTH,

Marc Schwartz




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