I use recordPlot() to save plots to disk that I render later to a
variety of formats. This works fine for base R plots and ggplot2
plots, and also used to work for lattice plots. However somewhere in
version 2.14 things stopped working for lattice plots. Here is an
example:
library(lattice);
histogram(rnorm(100));
x <- recordPlot();
saveRDS(x, "myplot.rds");
y <- readRDS("myplot.rds");
print(y);
Error: NULL value passed as symbol address
printing x works fine, but printing y either gives an error or prints
an empty page. The problem seems to be related to serializing the
recordedplot object, which contains a lot of memory pointers. Any tips
or workarounds?
> sessionInfo()
R version 2.14.1 (2011-12-22)
Platform: i686-pc-linux-gnu (32-bit)
locale:
[1] LC_CTYPE=en_US.UTF-8 LC_NUMERIC=C
[3] LC_TIME=en_US.UTF-8 LC_COLLATE=en_US.UTF-8
[5] LC_MONETARY=en_US.UTF-8 LC_MESSAGES=en_US.UTF-8
[7] LC_PAPER=C LC_NAME=C
[9] LC_ADDRESS=C LC_TELEPHONE=C
[11] LC_MEASUREMENT=en_US.UTF-8 LC_IDENTIFICATION=C
attached base packages:
[1] stats graphics grDevices utils datasets methods base
other attached packages:
[1] lattice_0.20-0
loaded via a namespace (and not attached):
[1] grid_2.14.1
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