R Scale plot elements within PDF of set width and height

Question

Though R plots sent to a PDF can be rescaled at will in an illustration or page layout software, scientific journals often insist that the plots provided have specific dimension

Answer 1

Oddly enough, you can do this with scale= in ggsave(...)

require(ggplot2)
p <- qplot(data=iris, x=Petal.Width, y=Petal.Length, colour=Species)
ggsave("test.1.pdf",p)
ggsave("test.2.pdf",p, width=3, height=3, units="in", scale=3)

Try playing with the scale parameter and see what you get...