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I'm working on a rather long code using R markdown, divided into chunks. Plot appear under the appropriate chunk. I'd like to keep this behaviour, but additionally I want to save them to a specified folder. I've tried different methods listed here How to save a plot as image on the disk? (and elsewhere on the Internet), but nothing seems to work.
My reproducible example:
png('cars_plot.png')
plot(cars)
dev.off()
This code saves the plot, but doesn't show it (it only returns "null device 1"). I've also tried dev.print and dev.copy, with the same result.
Thank you in advance!
Clarification: I run my chunks one by one, I don't want to convert my results to pdf/html yet. So knitr: include figures in report *and* output figures to separate files or change where rmarkdown saves images generated by r code don't answer my question.
875
You want to make sure that you save images you create in your rmarkdown document. To do this automatically, and avoid writing things like ggsave(plot) or dev. off() , just create the plots in rmarkdown, and tell it you want to save the output. In the funky looking code at the top, the YAML, specify keep_md: yes .
In RStudio, when you open a new RMarkdown file, in the editor pane, there is a cogwheel button / menu where you can choose "Chunk Output Inline". That should put the plots into the document.
If you are working with RStudio, the plot can be exported from menu in plot panel (lower right-pannel). It's also possible to save the graph using R codes as follow: Specify files to save your image using a function such as jpeg(), png(), svg() or pdf().
To save multiple plots to the same page in the PDF file, we use the par() function to create a grid and then add plots to the grid. In this way, all the plots are saved on the same page of the pdf file. We use the mfrow argument to the par() function to create the desired grid.
You can always graph it twice in the same markdown chunk, like this:
plot(cars)
png('cars_plot.png')
plot(cars)
dev.off()
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