Dear All,
I have the following function
tstpar <-
function(n = 200, want.pdf = FALSE, pdfFileName = NULL){
oldpar <- par(no.readonly = TRUE)
on.exit(par(oldpar))
steps <- seq(from = 1, to = 8, by = 1)
h <- 10; w <- 6
if(want.pdf){pdf(file = pdfFileName, onefile = TRUE,
paper = "letter", width = w, height = h)}
par(mfrow = c(4,2))
for(i in steps){
txt <- paste("i = ", i)
hist(rnorm(n), main = txt)
}
if(want.pdf){dev.off()}
}
when called with default values tstpar() every thing works fine.
However I get 2 sorts of warnings
1- if I call the function to generate a pdf as
tstpar(want.pdf = TRUE, pdfFilename = "jj.pdf")
I get the following warning msg:
calling par(new=) with no plot in: par(oldpar)
with an empty device which I don not understand since I close
the device in the function.
2- If I comment the line
if (want.pdf){dev.off()}
I get the following warning
'gamma' cannot be modified on this device in: par(args)
with 2 empty devices.
I do not understand why I get those warnings and why I get those empty devices.
I looked up in RSiteSearch and I found the 2 following posts
http://finzi.psych.upenn.edu/R/Rhelp02a/archive/38553.html
In this post M. Schwarz explains that there is not a plot created that's why R
generates the
warning. In the case of tstpar, I generate the hist plots and should not be
getting the warning.
And in the following post Prof Ripley refers to an old R warning for pdf()
devices
Which is not the case here.
http://finzi.psych.upenn.edu/R/Rhelp02a/archive/23215.html
I do not see what I am missing. Thanks for any hint.
I use R 2.5.1 under Win XP.
I apologize if the question is related to my older R version which I will
upgrade.
AA.
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