Using knitr to create HTML slide with separate output of just the R code

Question

I am using knitr to create a set of lecture slides for a class using R. I would like to create a separate "companion file" that contains just has the R code (corresponding to the slides), so that students can execute the R code by cutting and pasting from the companion file.

For example, in the .Rmd file:

``` {r ....}
plot(x,y)
```

Then there would be a text file with:

plot(x,y)

But, have such a file be automatically produced from the .Rmd file?

Even better if the .Rmd file has such tags:

``` {r basic.plot ....}
plot(x,y)
```

Then, text file has:

# basic.plot
plot(x,y)

Can this be accomplished using knitr?

Yes. Add tangle = TRUE when you are running knit and all code chunks will automatically be saved in an R file. — Ramnath
– Ramnath, Commented Dec 31, 2013 at 18:38

Chris · Accepted Answer · 2013-12-31 18:45:41Z

6

Yes, this is possible. What you're trying to do is called tangling, and it comes from the world of literate programming.

The knit function supports a tangle option that should be set to TRUE if you want to extract source code.

answered Dec 31, 2013 at 18:45

Chris

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2 Comments

Ben Bolker Over a year ago

or just purl(), for short.

user3149973 Over a year ago

Thank you everyone. The tangle=TRUE option produced the desired output. Thank you both for provided the solution and the background explanation.

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