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I've updated my ggplot2 library and I am now having a problem where after calling ggsave, the graphics device no longer displays the plot. I'm unable to resolve the issue meaning I cannot export the plots as needed. Please help.
Searching the web has revealed some mention of problems with dpi mismatches, but setting or changing the dpi appears to have no effect. This problem appears to have begun after doing an update of the ggplot2 library.
The following code reproduces the problem:
library(ggplot2);
df <- read.table(textConnection('value,value1
1,1
2,2
3,3 '),header=TRUE,sep=',');
ggplot(df,aes(x=value,y=value1)) + geom_point();
setwd('c:/temp');
ggsave('test.png');
After running, the output is blank, and the graphics device no longer displays the plot. Any subsequent plots are not displayed on the graphics device.
After running dev.off(), new plots are displayed okay, until ggsave is called again.
sessionInfo() reports the versions of R and libraries as:
R version 3.0.0 (2013-04-03)
Platform: i386-w64-mingw32/i386 (32-bit)
locale:
[1] LC_COLLATE=English_New Zealand.1252 LC_CTYPE=English_New Zealand.1252
[3] LC_MONETARY=English_New Zealand.1252 LC_NUMERIC=C
[5] LC_TIME=English_New Zealand.1252
attached base packages:
[1] stats graphics grDevices utils datasets methods base
other attached packages:
[1] plyr_1.8 ggplot2_0.9.3.1 RODBC_1.3-6
loaded via a namespace (and not attached):
[1] colorspace_1.2-2 dichromat_2.0-0 digest_0.6.3 grid_3.0.0 gtable_0.1.2
[6] labeling_0.1 MASS_7.3-26 munsell_0.4 proto_0.3-10 RColorBrewer_1.0-5
[11] reshape2_1.2.2 scales_0.2.3 stringr_0.6.2 tools_3.0.0
The problem occurs in 2.15.0 and 2.15.3 of R also.
EDIT: changed code so data would load using sep=',' rather than whitespace
ADDITION: further testing reveals that this may in fact be a bug with RStudio and how it is displaying the graphics device after ggsave, rather than R itself. Running the above script in RGui does not reproduce the problem, only in RStudio V0.97.336 + V0.97.449.
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In most cases ggsave() is the simplest way to save your plot, but sometimes you may wish to save the plot by writing directly to a graphics device. To do this, you can open a regular R graphics device such as png() or pdf() , print the plot, and then close the device using dev. off() .
A blank ggplot is drawn. Even though the x and y are specified, there are no points or lines in it. This is because, ggplot doesn't assume that you meant a scatterplot or a line chart to be drawn.
You can either print directly a ggplot into PNG/PDF files or use the convenient function ggsave() for saving a ggplot. The default of ggsave() is to export the last plot that you displayed, using the size of the current graphics device. It also guesses the type of graphics device from the extension.
2.1. The default size of the saved image is equal to the size of Plots pane (the “graphics device”) in RStudio, which can be found with dev. size() . Notice that the result of dev. size() and the message we receive when saving the plot with ggsave() give the same dimensions.
Seems to be an issue with RStudio. The issue is described here and here.
The workaround is to install RStudio V0.97.311, or ensure that you execute the ggplot and ggsave lines separately (i.e. don't select and run together in a block with control+enter).
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