R: Not able to save the plot

Question

I am generating a plot which I am able to see in the RMarkdown output but whenever I am trying to save it, I am getting just a blank(white) image. I am just adding following two lines before and after plot

png("Output.png")
#Plot code
dev.off()

It was working. And suddenly it stopped working. Can someone help me on this??

edit

When I do it with pdf

pdf("output.pdf")
#plot code
dev.off()

I am getting error as:

There was error opening this document. This document cannot be opened because it has no pages. 

Thanks.

Solution

From the comments I gather that I was right, you need to print the resulting ggplot2 object in order to show the plot, see also R FAQ 7.22.

Comments

[AHegde]

Hi, this happens to me even without using ggplot2 (I'm using base graphics "boxplot" function). Any idea why this might be happening?

[Paul Hiemstra]

@AHegde this problem is not related to this one as the boxplot function does not use grid graphics. Please create a new question which includes a reproducible example.