ggplot2 footnote

ggplot2, pdf, r

Solution

I would use something like that:

pdf("filename.pdf", width=10, height=6) # open an appropriate graphics device
print(p)
makeFootnote() # from webpage above (uses grid.text; ggplot2 is based on grid)
dev.off()

Problem

What is the best way to add a footnote to the bottom of a plot created with ggplot2? I've tried using a combination of the logic noted here as well as the ggplot2 `annotate` function. ``` p + annotate("text",label="Footnote", x=unit(1,"npc") - unit(2, "mm"),y=unit(2, "mm"), just=c("right", "bottom"),gp=gpar(cex= 0.7, col=grey(.5))) ``` but I am getting the error Error in as.data.frame.default(x[[i]], optional = TRUE, stringsAsFactors = stringsAsFactors) : cannot coerce class c("unit.arithmetic", "unit") into a data.frame

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