Save ggplot with a function

If you would like an image file instead of a pdf, also the following works

ggsave(filename="myPlot.jpg", plot=last_plot())

or with additional parameters, as follows.

ggsave(filename="myPlot.jpg", plot=lastplot(),
       width = 10, height = 5, 
       units = "cm", # other options are "in", "cm", "mm" 
       dpi = 200
       )

Also following file types are supported "eps", "ps", "tex" (pictex), "pdf", "jpeg", "tiff", "png", "bmp", "svg" or "wmf".

Following was useful for me, may be for someone else as well. One can save the last plot without explicitly referring it as well.

ggsave("filename.pdf",  # jpg, png, eps, tex, etc.
       plot = last_plot(), # or an explicit ggplot object name,
       width = 7, height = 5, 
       units = "in", # other options c("in", "cm", "mm"), 
       dpi = 300)

You can use print() to save plots produced from ggplot2 to a file.

First, define your function to save plots:

savePlot <- function(myPlot) {
        pdf("myPlot.pdf")
        print(myPlot)
        dev.off()
}

Create your plot:

 myPlot <- ggplot(ggplot(data=df.music, aes(x=music, y=number)) +
 geom_bar(stat="identity") +
 xlab(colnames(df.music)[1]) +
 ylab(colnames(df.music)[2]) +
 ylim(c(0,11)) +
 ggtitle("Ulubiony typ muzyki wśród studentów")

And finally call the function:

savePlot(myPlot)

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Alternatively, you could just use ggsave() after creating your plot:

ggsave(filename="myPlot.pdf", plot=myPlot)