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