Writing Figures to a File

Initialize a plot that will be written directly to a file using pdf, png, etc. Within the function you will need to specify a name for your image, and the width and height (optional). Then create a plot using the usual functions in R. Finally, close the file using the dev.off() function. There are also bmp, tiff, and jpeg functions, though the jpeg function has proven less stable than the others.

pdf("boxplot.pdf")
ggplot(data=df, aes(x= genotype, y=samplemeans, fill=celltype)) + 
  geom_boxplot() + 
  ggtitle('Genotype differences in average gene expression') +
  xlab('Genotype') +
  ylab('Mean expression') +
  theme(plot.title = element_text(size = rel(1.5)),
        axis.title = element_text(size = rel(1.5)),
        axis.text = element_text(size = rel(1.25)))
dev.off()