More Capable Cache in knitr

Note

This is one of a few posts on new features from a recent four-day knitr backlog sprint; see that post for the full details of the sprint.

knitr’s chunk cache is one of those features that may have quietly saved you hours. Set cache = TRUE on an expensive chunk and its results are stored on disk; next time you knit, if the code hasn’t changed, the stored results are reused instead of recomputed. Simple idea, and hard to be done well. Two changes this cycle make the cache …