[R] abline; setting plot limits

Rolf Turner r.turner at auckland.ac.nz
Mon Jun 16 04:39:37 CEST 2014

On 16/06/14 12:35, Jim Lemon wrote:
> On Mon, 16 Jun 2014 08:54:41 AM Rolf Turner wrote:
>> 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=ablinepiec
>>> e
>> 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.
> Hi Rolf and others,
> In fact Remko contributed that function to plotrix - ablineclip.

Sorry.  Wasn't aware of ablineclip().  Actually that function seems to 
use a quite different approach from that of ablinepiece(), and to be a 
substantial improvement.  Thanks for pointing it out to us.



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