[R] densityplot png in a for loop

[Prof Brian Ripley]

This is FAQ Q7.22

On Fri, 9 Feb 2007, Albert Vilella wrote:

> Hi all,
>
> I am trying to plot a list of densityplots as png files, but when I do
> it in a for loop, I get empty png files as a result.
>
> If I manually run the instructions inside the loop, it works... any hints?
>
> library(lattice)
> names_list = c("alfa","beta","gamma")
> for (i in 1:length(names_list)) {
>  pngfile = paste("example_",names_list[i],".png", sep="")
>  png(file=pngfile, width=1280,height=1024)
>  input = rnorm(1000,i)
>  densityplot(~input,
>              plot.points=FALSE,
>              auto.key=TRUE
>              )
>  dev.off()
> }
>
> Thanks,
>
>    Albert.
>
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-- 
Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
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