On Jul 13, 2011, at 5:55 PM, Stephen Eick wrote:
I have a weird example which fails and I don't understand why. If I
put dev.off() inside my function, it produces a bad image file. But
if I run what I think should be equivalent code with dev.off() running
outside my function, it works. Why does the location of dev.off
matter?
It's in the misc section of the R-FAQ:
(Title is something along the lines of "Why don't lattice plots show
up?" but its more general than lattice and also applies to ggplot/
ggplot2)
--
David.
library(Cairo)
library(ggplot2)
foo<-function(){
Cairo(file="a.png")
cat(dev.cur(), "\n")
qplot(1:10,1:10)
dev.off();
}
foo()
# file a.png is bad
foo1<-function(){
Cairo(file="a.png")
cat(dev.cur(), "\n")
qplot(1:10,1:10)
}
foo1(); dev.off()
# file a.png is good
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David Winsemius, MD
West Hartford, CT
______________________________________________
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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.
