NOTE 2: Images in the final HTML documents are responsive – meaning that their dimensions may change with changes to the browser view size. NOTE 1: This post is focused on the production of HTML documents and some of our conclusions and recommendations may not apply if you're using R Markdown to create a LaTeX document, PDF or Word document. We assembled this blog post to help guide you through image processing decision-making as you construct your own R Markdown reports. R Markdown offers a wide range of functions and arguments for full control of image sizes but knowing how and when to use them can be daunting particularly given the differences in how external images are handled vs R-generated figures. R Markdown reports that are heavy on graphs and maps, though, can yield large HTML files that are not optimized for web viewing. For example, to create space between the output blocks in the top row of the previous example, use, ].Writing reports in R Markdown allows you to skip painful and error-prone copy-paste in favor of dynamically-generated reports written in R and markdown that are easily reproducible and updateable. If none, do not process raw HTML table in cell output and leave it as-isĢd-array of widths where the first dimension specifies columns and the second rows.įor example, to layout the first two output blocks side-by-side on the top with the third block spanning the full width below, use, ]. True: Always apply markdown table widths ( true is the default for all non-HTML formats)įalse: Never apply markdown table widths.Īn array of numbers (e.g. ( auto is the default for HTML output formats) Other formats (e.g. LaTeX) require table column sizes in order to correctly flow longer cell content (this is a major reason why tables > 72 columns wide are assigned explicit widths by Pandoc).Īuto: Apply markdown table column widths except when there is a hyperlink in the table (which tends to throw off automatic calculation of column widths based on the markdown text width of cells). Some formats (e.g. HTML) do an excellent job automatically sizing table columns and so don’t benefit much from column width specifications. The default hook ( ffmpeg) uses FFmpeg to convert images to a WebM video.Īnother hook function is gifski based on the gifski package to create GIF animations.Īpply explicit table column widths for markdown grid tables and pipe tables that are more than columns characters wide (72 by default). Hook function to create animations in HTML output. Time interval (number of seconds) between animation frames.Įxtra options for animations see the documentation of the LaTeX animate package. Sanitize tikz graphics (escape special LaTeX characters). hide: Generate plot files but hide them in the output document.Īdditional raw LaTeX or HTML options to be applied to figuresĮxternalize tikz graphics (pre-compile to PDF).animate: Concatenate all plots into an animation if there are multiple plots in a chunk.
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