Full_Name: Chris Bodily
Version: 1.5.1
OS: W2K
Submission from: (NULL) (63.106.106.2)
I took the following code directly from the 'split.screen' help page in
R and
modified one line to highlight the problem I encountered. Basically, it appears
that when plotting in split screens and attempting to return to a particular
screen to add or update points, the axes from the original plot are not
remembered, causing the new points to plot incorrectly.
A workaround seem to be storing the original plot range and issuing
'plot(x,y,type="n")' where x and y are data vectors with
ranges that match the
original plot in the screen of interest. Then a 'points' command draws
in the
correct locations.
I found this by moving working code from S-Plus 2000 into R v1.5.1 and noticed
that a particular interactive plot I use began drawing incorrectly.
Thanks,
Chris Bodily
#--------------------------------------------------------------------------------------
if (interactive()) {
par(bg = "white") # default is likely to be transparent
split.screen(c(2,1)) # split display into two screens
split.screen(c(1,2),2) # split bottom half in two
plot(1:10) # screen 3 is active, draw plot
erase.screen() # forgot label, erase and redraw
plot(1:10, ylab= "ylab 3")
screen(1) # prepare screen 1 for output
plot(1:10)
screen(4) # prepare screen 4 for output
plot(1:10, ylab="ylab 4")
screen(1, FALSE) # return to screen 1, but do not clear
# plot(10:1,axes=FALSE, pch=2,col=5, lty=2, ylab="") # overlay
second plot
## Problem here as the following points get plotted incorrectly ##
## it seems that the axes are reset ##
points(rep(3,10),1:10,col=2,pch=2) # add a few more points for a test
axis(4) # add tic marks to right-hand axis
title("Plot 1")
close.screen(all = TRUE) # exit split-screen mode
}
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