ggsave(): Error in UseMethod(“grid.draw”) : no app

Question

I am trying to save a plot with ggsave(). I enter the following:

library(ggplot2)

Test = data.frame("X" = seq(1, 10, 1), "Y" = 2*seq(1, 10, 1))

P = ggplot(
    Test, aes(x=X, y=Y))+
    geom_line()

ggsave(P, "test.pdf", device = "pdf")

But get the error:

Saving 7 x 7 in image
Error in UseMethod("grid.draw") : 
  no applicable method for 'grid.draw' applied to an object of class "character"

Answer 1

Many R functions that save data, such as write.table(), saveRDS() etc. take as their first argument the object to be saved. But, this is not true for ggsave(). Instead, by default, its first argument is the name of the file to save to. Thus, the syntax above would need to be modified in one of two ways:

ggsave(plot = P, "test.pdf", device = "pdf")
ggsave("test.pdf", P, device = "pdf")