[R] Layout() coordinates and drawing lines / segments

From: <maria_at_meteo.mcgill.ca>
Date: Thu, 26 Jun 2008 13:55:11 -0400 (EDT)


Hello,

I am trying to wrap my head around the coordinates systems associated with the layout() function ...with the end goal of simply drawing a decorative line in the upper margin of my figure, which is composed of three plots.

My output is defined as this:


     postscript("out.ps", horizontal=FALSE,
     +width=7.5,height=11.5,pointsize=10, paper = "special" )

     opar <- par(omi=c(0.1,0.1,0.1,0.1))

     layout_mat = matrix(c(1,2,3),nrow=3,ncol=1,byrow=TRUE)
     my_layout <-

layout(layout_mat,widths=c(1,1,1),heights=c(1,1.5,1.5),respect=FALSE)

2 Questions:
How do i find what are the x,y's of the upper margin ? (I've heard of locator() but i don't think i can use it here as i have an output file)

And, also, am i allowed to draw lines using segments() or lines() in the margin regions -- defined by omi, oma -- of my figure, or are those functions confined to plot regions ?

Thank You a lot,
maria



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