R：导出为 PDF 时，图例文本超出绘图范围

Question

When I add a legend to my R plot (using the legend() function), then it works in Rstudio, but when I export the plot as a PDF with a different size, then sometimes the text inside the legend is larger than the legend box itself.

What is going on here and how do I fix it?

If I export the image with a larger width, then the legend box becomes larger too and manages to contain its text, but this is silly: I want the legend box and its text to automatically adjust to whatever width I choose, no matter how small it is.

And please don't recommend ggplot2 .

Answer 1

As @Gregor said - you should use pdf() . I am merely adding his suggestion as an answer. Your code would be something like this:

pdf("picture.pdf", width=6, height=6)
plot(...)
legend(...)
dev.off()

Where pdf() opens a new device for plotting (of course you have to set file name as well as dimensions according to your needs), and dev.off() closes the device writing everything to a file.

I am not sure what causes the issue with legend in R-studio. But on my machine I noticed that legends sometimes have issues with updating after resizing the device. Probably this is something related.