Moving forward we're going to refer to our uploaded image as image and the R-generated plot as figure. The plot is created using the package ggplot2. In this post we'll work with a pre-existing image as well as a dynamically generated plot. Our examples: one pre-existing image and one dynamically generated plot More functionality from include_graphics.Bonus knitr and R markdown functionality.Optimize R-generated images with optipng or pngquant.The fig.retina argument is a resolution multiplier.Use dpi to change the resolution of images and figures.Arguments out.width and out.height apply to both existing images and R-generated figures.Use fig.width and fig.height for R-generated figures only.Default settings for including images and figures in R Markdown.Our examples: one pre-existing image and one dynamically generated plot.In this post, we report image dimensions as they appear at full size on a computer monitor for reference. 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. YouTube automatically generates an image for every video ( ), so we can use that and link the image to the video on YouTube.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. We can take that ID and put it in the following template: ()]() The last part of the URL ( 8q2IjQOzVpE) is the ID of the video. Since YouTube makes this easy, we’ll use them as an example. You could do this with practically any video on any video service. If your Markdown application doesn’t support HTML, you can’t embed a video, but you can come close by adding an image and a link to the video. If your Markdown application supports HTML, you should be able to embed a video in your Markdown file by copying and pasting the HTML code provided by a video website like YouTube or Vimeo. The rendered output looks like this: Table of Contents You can separate paragraphs within a table cell by using one or more HTML tags. But there are workarounds for at least two common table issues: Line breaks and lists. You can’t use many Markdown syntax elements to format the text in table cells. Here’s a partial list of HTML entities for symbols:įor a complete list of available HTML entities, refer to Wikipedia’s page on HTML entities. For example, if you want to display the copyright sign (©), you can copy and paste the HTML entity for copyright ( ©) into your Markdown document. The symbol should appear as expected in the rendered output.Īlternatively, if your Markdown application supports HTML, you can use the HTML entity for whatever symbol you want to use. For example, if you need to display Pi (π), just find the symbol on a webpage and copy and paste it into your document. However, in most cases, you can copy and paste whatever symbol you want to use into your Markdown document. Markdown doesn’t provide special syntax for symbols. So if you stick four instances of before a paragraph, the paragraph will look like it’s indented four spaces. Basically, every in your Markdown source will be replaced with a space in the rendered output. This should probably be your option of last resort as it can get awkward. It also provides template customization options so that you can make the rendered document look the way you expect it to, indentation and all.Īnother option, if your Markdown processor supports HTML, is to use the HTML entity for non-breaking space ( ). For example, iA Writer allows you to customize indentation settings for the editor in the application preferences. This is common in applications that are more oriented towards desktop publishing. Your best bet might be to use a Markdown editor that supports indentation. But what if you need to indent a paragraph the old-fashioned way, using the tab key? Markdown doesn’t provide an easy way of doing that. You can use trailing whitespace to create line breaks, and you can use tabs to create code blocks. Tabs and whitespace have a special meaning in Markdown.
0 Comments
Leave a Reply. |