![]() For example, when you navigate to a different chapter, you are actually viewing the old output of that chapter (which may not even exist). Since previewing a chapter only renders the output for that specific chapter, you should not expect that the content of other chapters is correctly rendered as well. That is a reasonably small price to pay for the gain in speed. One downside of previewing a chapter is that the cross-references to other chapters will not work, since bookdown knows nothing about other chapters in this case. Although the preview works for all output formats, we recommend that you preview the HTML output. Previewing the current chapter is helpful when you are only focusing on that chapter, since you can quickly see the actual output as you add more content or revise the chapter. Only the Rmd files passed to preview_chapter() will be rendered. However, you can choose to render only one chapter at a time using the function preview_chapter() in bookdown, and usually this will be much faster than rendering the whole book. The former can be improved by enabling caching in knitr using the chunk option cache = TRUE, and there is not much you can do to make the latter faster. Two things can affect the speed of building a book: the computation in R code chunks, and the conversion from Markdown to other formats via Pandoc. Preview a chapterīuilding the whole book can be slow when the size of the book is big. Since deleting files is a relatively dangerous operation, we would recommend that you maintain your book through version control tools such as GIT, or a service that supports backup and restoration, so you will not lose certain files forever if you delete them by mistake. If you have looked at this list of files, and are sure no files were mistakenly identified as output files (you certainly do not want to delete an input file that you created by hand), you can delete all of them using bookdown::clean_book(TRUE). By default, it tells you which output files you can possibly delete. The function clean_book() was designed for this purpose. Sometimes you may want to clean up the book directory and start all over again, e.g., remove the figure and cache files that were generated automatically from knitr. The new_session argument has been explained in Section When you set preview = TRUE, only the Rmd files specified in the input argument are rendered, which can be convenient when previewing a certain chapter, since you do not recompile the whole book, but when publishing a book, this argument should certainly be set to FALSE.Ī number of output files will be generated by render_book(). This can also be changed via the output_dir field in the configuration file _bookdown.yml, so that you do not have to specify it multiple times for rendering a book to multiple output formats. By default, the book is generated to the _book directory. ![]() The output directory of the book can be specified via the output_dir argument. Arguments clean and envir are passed to rmarkdown::render(), to decide whether to clean up the intermediate files, and specify the environment to evaluate R code, respectively. ![]() The Shell script does not work on Windows (not strictly true, though), but hopefully you get the idea. ![]() serve_book: Continuously preview the HTML output of a book using the.īookdown::render_book ( "index.Rmd", "bookdown::gitbook" )īookdown::render_book ( "index.Rmd", "bookdown::pdf_book" ).resolve_refs_html: Resolve figure/table/section references in HTML.render_book: Render multiple R Markdown documents into a book.publish_book: Publish a book to the web.pdf_book: Convert R Markdown to a PDF book.html_document2: Output formats that allow numbering and cross-referencing.html_chapters: Build book chapters into separate HTML files.fence_theorems: Convert the syntax of theorem and proof environments from.clean_book: Clean up the output files and directories from the book.calibre: A wrapper function to convert e-books using Calibre.build_chapter: Combine different parts of an HTML page.bs4_book: HTML book built with bootstrap4.bookdown_site: R Markdown site generator for bookdown.bookdown-package: Authoring Books and Technical Documents with R Markdown.
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