Hi
Dan Davison wrote:
I'm working over an ssh connection without X11 graphics. I'm making a
plot, the first stage of drawing which takes a long time. I want to
experiment with adding details. Here is what I was hoping to do, which
results in error.
## Draw the master plot on png dev 2
png(file="master.png")
plot(1:10)
## Save a copy on png dev 3
png(file="copy1.png")
dev.set(2)
dev.copy(which=3)
## Add details to copy, write to disk and view
abline(v=5)
Error in int_abline(a = a, b = b, h = h, v = v, untf = untf, ...) :
plot.new has not been called yet
Can someone tell me how to do this correctly?
The problem is that the "display list" is turned off by default for
png() devices, so there is no record of what has been drawn, so when you
do dev.copy(), there is nothing to copy. If you turn the display list
on, it should work much better ...
png(file="master.png")
## TURN DISPLAY LIST ON
dev.control("enable")
plot(1:10)
## Save a copy on png dev 3
png(file="copy1.png")
dev.set(2)
dev.copy(which=3)
## Add details to copy, write to disk and view
abline(v=5)
... hope that helps.
Paul
Thanks a lot,
Dan
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Dr Paul Murrell
Department of Statistics
The University of Auckland
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http://www.stat.auckland.ac.nz/~paul/
______________________________________________
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
