Saving multiple ggplots from ls into one and separate files in R

Question

I have several ggplots as objects on my ls. I want to save them as separate files (although I would also be interested to know how to save them all under 1 big file). I have

Answer 1

it's best to have your plots in a list

l = mget(plots)

Then you can simply print them page-by-page,

pdf("all.pdf")
invisible(lapply(l, print))
dev.off()

or save one plot per file,

invisible(mapply(ggsave, file=paste0("plot-", names(l), ".pdf"), plot=l))

or arrange them all in one page,

ggsave("arrange.pdf", arrangeGrob(grobs = l))

or arrange them 2x2 in multiple pages,

ggsave("arrange2x2.pdf", marrangeGrob(grobs = l, nrow=2, ncol=2))

etc.

(untested)