R help - Jun 2009 - How to draw a line in plot when I know the start point(x1, y1) and end point(x2, y2)?

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



      Veja quais são os assuntos do momento no Yahoo! +Buscados

	[[alternative HTML version deleted]]

Dear Lesandro,
Take a look at

?segments

HTH,

Jorge


On Thu, Jun 25, 2009 at 2:30 PM, Lesandro <lesandrop@yahoo.com.br> 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
>
>
>
>      Veja quais são os assuntos do momento no Yahoo! +Buscados
>
>        [[alternative HTML version deleted]]
>
>
> ______________________________________________
> R-help@r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>
>
	[[alternative HTML version deleted]]

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