On Jul 11, 2011, at 12:08 PM, jeroen00ms wrote:
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);
}
> ?Devices
> ?capabilities
> capabilities()
jpeg png tiff tcltk X11 aqua http/ftp sockets
TRUE TRUE TRUE TRUE TRUE TRUE TRUE TRUE
libxml fifo cledit iconv NLS profmem cairo
TRUE TRUE TRUE TRUE TRUE TRUE TRUE
I have all of the requested capabilities (and more.)
So the use case is that after running testplot() which took
potentially 30
days to calculate,
Unfortunately you basically threw away all of the intermediate steps
by plot()-ting at the very end, since that function returns NULL. If
you had plotted first and then executed return(data_object) and then
did no operations, you would be able to capture the last calculation
with:
data_object <- .Last.value
Plotting with lattice or ggplot may leave a plot object in the
workspace. If done within a function you will need to return it so it
doesn't disappear.
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.
You can also save a data (or function) object to an .Rdata file with
save(objname, file="filename.Rdata") and your colleagues could then
load("filename.Rdata") in R.
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