OverviewTeaching: 10 min
Exercises: 10 minQuestions
How can I save plots and data created in R?Objectives
To be able to write out plots and data from R.
You can save a plot from within RStudio using the ‘Export’ button in the ‘Plot’ window. This will give you the option of saving as a .pdf or as .png, .jpg or other image formats.
Sometimes you will want to save plots without creating them in the ‘Plot’ window first. Perhaps you want to make a pdf document with multiple pages: each one a different plot, for example. Or perhaps you’re looping through multiple subsets of a file, plotting data from each subset, and you want to save each plot, but obviously can’t stop the loop to click ‘Export’ for each one.
In this case you can use a more flexible approach. The function
pdf("Hclust_corplot_mtcars.pdf", width=5, height=5) corrplot(cor_mtcars, order = "hclust", addrect = 3) # You then have to make sure to turn off the pdf device! dev.off()
Open up this document and have a look.
png etc. are used similarly to produce
documents in different formats.
At some point, you’ll also want to write out data from R.
We can use the
write.table function for this, which is
very similar to
read.table from before.
Let’s create a data-cleaning script, for this analysis, we only want to focus on the gapminder data for Australia:
aust_subset <- gapminder[gapminder$country == "Australia",] write.table(aust_subset, file="gapminder-aus.csv", sep=",", row.names = FALSE, quote = FALSE )
or directly as a .csv file
aust_subset <- gapminder[gapminder$country == "Australia",] write.csv(aust_subset, file="gapminder-aus.csv", row.names = FALSE, quote = FALSE )
Save plots from RStudio using the ‘Export’ button.
write.tableto save tabular data.