R help - Jun 2014 - abline; setting plot limits

Relatively new user with a question regarding abline.

I want to draw a st. line fit to some data but I want the line to span the
range of the x-data and NOT the plot limits.
In short the line spans xmin to xmax(of plot axis) but I want it to span
xmin to xmax (of x data).
Can this but done with abline or do I have to use lines and construct the
line from a+bx?


Paul Rydelek, Ph.D.
5232 Dorset Dr.
Memphis, TN  38117

On 14/06/2014, 11:34 PM, Paul Rydelek wrote:
> Relatively new user with a question regarding abline.
> 
> I want to draw a st. line fit to some data but I want the line to span the
> range of the x-data and NOT the plot limits.
> In short the line spans xmin to xmax(of plot axis) but I want it to span
> xmin to xmax (of x data).
> Can this but done with abline or do I have to use lines and construct the
> line from a+bx?
You can use lines() or segments(), you can't use abline().

Duncan Murdoch
> 
> 
> Paul Rydelek, Ph.D.
> 5232 Dorset Dr.
> Memphis, TN  38117
> 
> 
> 
> 
> 
> 
> ______________________________________________
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> PLEASE do read the posting guide
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> and provide commented, minimal, self-contained, reproducible code.
>

On 15/06/14 15:34, Paul Rydelek wrote:
> Relatively new user with a question regarding abline.
>
> I want to draw a st. line fit to some data but I want the line to span the
> range of the x-data and NOT the plot limits.
> In short the line spans xmin to xmax(of plot axis) but I want it to span
> xmin to xmax (of x data).
> Can this but done with abline or do I have to use lines and construct the
> line from a+bx?
A function with this capability was posted by Remko Duursma on 22/1/09. See:
> http://article.gmane.org/gmane.comp.lang.r.general/137344/match=ablinepiece
cheers,

Rolf Turner

P. S.  Jim: Perhaps this function could/should be added to plotrix.  If 
you are interested, I have written a help file for it.

R. T.