Hi
What you are doing "wrong" is loading a recordedplot into the same
session that it was created in. The saveRDS()/readRDS() works if you
save in one R session and then read in a different R session. The
assumption is that if you are still in the same session that created the
recordedplot you still have the recordedplot (e.g., you can just do
replayPlot(r) instead of replayPlot(r2). Is that a bad assumption ?
Paul
On 03/04/18 05:23, Winston Chang wrote:
The documentation for recordPlot says the following:
As of R 3.3.0, it is possible (again) to replay a plot from another R session
using, for example, saveRDS and readRDS.
However, I haven't been able to save and restore a plot displaylist
and have it work within the same R session, using R 3.4.3 or 3.3.3.
Here's an example:
# Save displaylist for a simple plot
png('test.png')
dev.control(displaylist ="enable")
plot(1:5, 1:5)
r <- recordPlot()
dev.off()
# Replay plot. This works.
png('test1.png')
replayPlot(r)
dev.off()
# Save the plot and load it, then try to replay it. This does not work.
saveRDS(r, 'recordedplot.rds')
r2 <- readRDS('recordedplot.rds')
png('test2.png')
replayPlot(r2) ## Error: NULL value passed as symbol address
dev.off()
Is there something that I'm doing wrong here?
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Dr Paul Murrell
Department of Statistics
The University of Auckland
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