[R] Save generic plot to file (before rendering to device)

[jeroen00ms]

I am looking for a way to save a plot (graphics contents) to a file after the
plot has been calculated but before it has been rendered. More specifically,
assume that I made a plot that took a very long time to produce, I would
like to save this plot to a generic file that I can later, on a different
machine, render to either PDF, PNG, SVG using the usual R graphics devices,
without recalculating the graphical contents.

As a toy example, suppose this is my plot function:

testplot <- function(){
  Sys.sleep(10); #very long and complicated procedure
  plot(cars);
}

So the use case is that after running testplot() which took potentially 30
days to calculate, I would like to send a file to my colleagues that they
can load in R and send to their png or pdf or svg devices just as if they
would have made the plot themselves, without having to re-run the code.


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