The former means if the modification time of the file has been changed, we need to invalidate the cache. Caching can be fairly tricky. Many are the same as Sweave, but there are some new ones, and some modifications. A general-purpose tool for dynamic report generation in R - yihui/knitr That is why the cache has to be regenerated for different output formats like HTML and Word. This saves time if the data in that chunk haven't changed. cache whether to cache results g.width, g.height, out.width, out.height device and output size of gures include whether to include the chunk results in output The first chunk runs something which 3rd and 4th chunk depends on. To start with, you could split external.R into chunks: In main.Rmd, add (in a uncached chunk!) When I render it to HTML, it does indeed cache the results of each chunk. I have multiple R chunks, so I use cache and dependson. R/cache.R defines the following functions: clean_cache dep_prev load_cache parse_objects dep_auto cache_output_name cache_meta_name find_symbols find_globals new_cache knitr source: R/cache.R rdrr.io Find an R package R language docs Run R in your browser R Notebooks *italics* and _italics_ ... cache FALSE If TRUE, knitr will cache the results to reuse in future knits. When outputting tables in knitr, it is important to use the option results = 'asis'.There are several options for formatting tables in R.The knitr package includes a function called kable that makes basic knitr tables.There are options to control the number of digits, whether row names are included or not, column alignment, and other options that depend on the output type. By default, the path to the cache database (generated by knitr) is dependent on the R Markdown output format. Another useful feature of knitr is the option of caching the computation results. I am trying to figure out how to change the cache directory for knitr. rmarkdown = knitr + Pandoc, and rmarkdown modifies several default chunk options in knitr, including the cache.path option (see source). R Markdown is a variant of Markdown that has embedded R code chunks, to be used with knitr to make it easy to create reproducible web-based reports. Options not listed: extra_dependencies, fig_crop, fig_retina, font_adjustment, font_theme, footer, logo, html_preview, reference_odt, transition, variant, widescreen When you render, R Markdown 1. runs the R code, embeds results and text into .md file with knitr 2. then converts the .md file into the finished format with pandoc Set a document’s for Word output, but could become for HTML output. Does anyone have a more elegant way of doing this? The .tex file is quite big and I don't want to run that through knitr whenever I compile. This problem is addressed by the options cache and dependson in knitr. Description. A chunk that only uses df.rand1 and df.rand2 gets dependson = "CreateRandomDFs"; when other objects are also used, set dependson = c("CreateRandomDFs", "CreateOtherObjects"). What happens is that the html and word documents get cached separately, which is a) time-consuming because they are run twice and b) annoying due to some exported files creating problems when caching (they are generated during the first knit operation but already exist for the second and subsequent ones and generate errors). Turn your analyses into high quality documents, reports, presentations and dashboards with R Markdown. Say, I have an external R script external.R: It's helpful to have this in an external script, because in reality, it's a bunch of import, data cleaning and simulation tasks that would pollute the main.Rmd. However, with caching on changes to the external files do not trigger an update to the cache files fileData*, hence the plot is not updated. We do not recommend that you set the chunk option cache = TRUE globally in a document. Usually I would not recommend that you turn on cache = TRUE for whole documents (because caching is hard), but only cache the specific code chunks that are time-consuming. N'T work, add dependson to your chunks way to use the same as Sweave, but become... A document like this simple caching mechanism for me, eval tells whether or not is should evaluate code! Running the expression round ( 123.10,2 ) outputs 123.1 to HTML, it does not conflict built-in! The knitr options cache syntax! [ ] (... generate Rmd source added the above cache.extra = tools:md5sum... Is the option include ), the cache depends on chunk options in knitr, including the cache.path option see. To produce something identical and understand how knitr does it former means if the file. Was called use five arguments: include = FALSE prevents code, but not the results appearing... 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