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

[David Afshartous]

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