[R] how to make lines() meet axis in autoscaled coordinate system?

[Johannes Graumann]

Grand!

Thanks so much!

Joh

On Thu, 26 Aug 2004 18:15:44 -0300 (ADT)
Rolf Turner <rolf at math.unb.ca> wrote:

> 
> Johannes Graumann wrote:
> 
> > I have an auto-scaled coordinate system and would like to add some
> > clarifying lines to the graph - which ares supposed to meet the
> > axis.
> > 
> > >lines(c(0,time1,time1), c(1,1,0),lty=3)
> > 
> > does what I want, BUT the second leg does not touch the x-axis since
> > the auto-scaling of the y-axis does not start at'0' but slightly
> > negative. I could now adjust the line length by 'trial and error' to
> > suit my needs, but I'd prefer a generalizable solution like
> > 
> > >lines(c(<some_macro_for_y-axis_position>,time1,time1),
> > +	c(1,1,<some_macro_for_x-axis_position>),lty=3)
> 
> 	lines(c(par()$usr[1],time1,time1), c(1,1,par()$usr[3]),lty=3)
> 
> 				cheers,
> 
> 					Rolf Turner
> 					rolf at math.unb.ca
>