[R] (x,y) coordinates for grid.text()

From: David Afshartous <dafshartous_at_med.miami.edu>
Date: Tue, 04 Mar 2008 12:12:33 -0500

All,

When using grid.text it seems my supplied (x,y) coordinates are being plotted only in npc (normalized parent coordinates) where (.5,.5) is the center of the graph. How do I allow (x,y) to be coordinates corresponding to the (x,y) values in the graph? The examples in ?grid.text seem to do this. (I think the problem lies in how x and y are defined with respect to unit ). Any help much appreciated. Sample code below.

Cheers,
David

y = c( 0.4, 0.6, -0.1, 0.3, 0.3, -0.2, 0.7, 0.7, 0.2, 0.0, 0.9,
-0.1, 0.6, -1.1, 0.8, -1.0, 0.4, 0.1, 0.7, -0.2, -0.1, -0.1, 2.2,
0.7, 1.1, 0.2, -0.2, -0.9, 0.4, 0.1, -0.3, -0.4) x = c(4.1000, 4.9600, 1.2000, 3.9000, 3.1875, 1.9000, 1.8625, 0.7650, 1.5750, 2.4700, 1.6250, 1.5500, 2.3125, 1.3125, 1.0600,
-0.5500, 1.1000, 0.0200, -0.0375, 3.4600, 2.5250, 2.0950, 0.8000,
1.6050, -0.4150, -0.7300, 1.1550, 1.4850, 2.2000, 2.2500, 0.6000, 2.1000)
junk.frm = data.frame(ID = rep(1:16, each = 2), x, y, z = rep(c("D", "P"), 16))
xyplot(y ~ x , data = junk.frm[junk.frm$z =="D",], type = c("g", "p", "smooth"), pch = 20)

grid.text("put text here", x = 1, y = 1.5) # doesn't show up grid.text("put text here", x = .4, y = .7) # shows up in the desired location but this is for npc



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