Hi,

I have the following script:
---- t.R ---
grafica <- function() {
  v <- read.csv('preprocessed/komolongma.ece.uprm.edu.active',sep=',')
  x <- as.ts(v$active)
  bitmap(file="output.png")
  densityplot(~x,col='blue',main='Density Plot')
  dev.off()
}
grafica()
---- t.R ---

When I "sourced" it from R prompt, it quietly runs. However the "output.png" generated contains any visible data. I said that, because the file is created and it has 2062 bytes.
--- execution ---
> library(lattice)
> source(file="t.R")
>
--- execution ---

Now, if I sequentially run the lines above in the R prompt, the "output.png" file contains a graphical representation of the data.
--- execution 2 ----
> v <- read.csv('preprocessed/komolongma.ece.uprm.edu.active',sep=',')
> x <- as.ts(v$active)
> bitmap(file="output.png")
> densityplot(~x,col='blue',main='Density Plot')
> dev.off()
---- execution 2 ---

What is wrong with the densityplot function that produces any output when is invoked from a script?
Someone has a script invoking the densityplot function?

Thanks a lot for your help.

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