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?