[R] lattice::xyplot & file output

[Rolf Turner]

See FAQ 7.22 and fortune("line 800").

     cheers,

         Rolf Turner

On 21/12/12 06:29, Sam Steingold wrote:
> Hi,
> When I was using the regular plot() function, I added this:
>
> --8<---------------cut here---------------start------------->8---
>    if (!is.null(file)) {
>      do.call(tools::file_ext(file),list(file = file))
>      on.exit(dev.off())
>      cat("writing",file,"\n")
>    }
> --8<---------------cut here---------------end--------------->8---
>
> to the beginning of each of my functions which plotted anything.
> now that I am using lattice::xyplot to plot multiple lines, the above
> code does NOT result in the plot being written to a file.
> why?
>
> I trued passing file=file to xyplot but that appears to be ignored too.
>
> so, how do I tell lattice::xyplot to write charts in png files?
>
> thanks!
>
>