Shiny R Markdown


Interactive documents are a new way to build Shiny apps. An interactive document is an R Markdown file that contains Shiny widgets and outputs. You write the report in markdown, and then launch it as an app with the click of a button.

Is there a way to insert (and evaluate) an RMarkdown script in a shiny application. (Note, I am not looking for a shiny application in RMarkdown that is explained here, nor am I looking for Markdown scripts in shiny (see Shiny Gallery Markdown)). I am building an application that has text, equations, code-chunks, plots, and interactive elements. 3つのRファイル(ui.r、server.r、global.r)を含むShinyアプリがあります。通常の.Rドキュメントの場合は、次のようにコードを埋め込むことができます。 :Serban Tanasa#日付:. Jun 30, 2017 - This Pin was discovered by Aleksandr Blekh. Discover (and save!) your own Pins on Pinterest. Interactive documents are a new way to build Shiny apps. An interactive document is an R Markdown file that contains Shiny widgets and outputs. You write the report in markdown, and then launch it as an app with the click of a button. This article will show you how to write an R Markdown report. The first official book authored by the core R Markdown developers that provides a comprehensive and accurate reference to the R Markdown ecosystem. With R Markdown, you can easily create.

This article will show you how to write an R Markdown report.

The companion article, Introduction to interactive documents, will show you how to turn an R Markdown report into an interactive document with Shiny components.

R Markdown

R Markdown is a file format for making dynamic documents with R. An R Markdown document is written in markdown (an easy-to-write plain text format) and contains chunks of embedded R code, like the document below.

R Markdown files are designed to be used with the rmarkdown package. rmarkdown comes installed with the RStudio IDE, but you can acquire your own copy of rmarkdown from github with the command

Shiny App R Markdown

R Markdown files are the source code for rich, reproducible documents. You can transform an R Markdown file in two ways.

  1. knit - You can knit the file. The rmarkdown package will call the knitr package. knitr will run each chunk of R code in the document and append the results of the code to the document next to the code chunk. This workflow saves time and facilitates reproducible reports.

    Consider how authors typically include graphs (or tables, or numbers) in a report. The author makes the graph, saves it as a file, and then copy and pastes it into the final report. This process relies on manual labor. If the data changes, the author must repeat the entire process to update the graph.

    In the R Markdown paradigm, each report contains the code it needs to make its own graphs, tables, numbers, etc. The author can automatically update the report by re-knitting.

  2. convert - You can convert the file. The rmarkdown package will use the pandoc program to transform the file into a new format. For example, you can convert your .Rmd file into an HTML, PDF, or Microsoft Word file. You can even turn the file into an HTML5 or PDF slideshow. rmarkdown will preserve the text, code results, and formatting contained in your original .Rmd file.

    Conversion lets you do your original work in markdown, which is very easy to use. You can include R code to knit, and you can share your document in a variety of formats.

In practice, authors almost always knit and convert their documents at the same time. In this article, I will use the term render to refer to the two step process of knitting and converting an R Markdown file.

You can manually render an R Markdown file with rmarkdown::render(). This is what the above document looks like when rendered as a HTML file.

In practice, you do not need to call rmarkdown::render(). You can use a button in the RStudio IDE to render your reprt. R Markdown is heavily integrated into the RStudio IDE.

Getting started

To create an R Markdown report, open a plain text file and save it with the extension .Rmd. You can open a plain text file in your scripts editor by clicking File > New File > Text File in the RStudio toolbar.

Be sure to save the file with the extension .Rmd. The RStudio IDE enables several helpful buttons when you save the file with the .Rmd extension. You can save your file by clicking File > Save in the RStudio toolbar.

R Markdown reports rely on three frameworks

  1. markdown for formatted text
  2. knitr for embedded R code
  3. YAML for render parameters

The sections below describe each framework.

Markdown for formatted text

.Rmd files are meant to contain text written in markdown. Markdown is a set of conventions for formatting plain text. You can use markdown to indicate

  • bold and italic text
  • lists
  • headers (e.g., section titles)
  • hyperlinks
  • and much more

The conventions of markdown are very unobtrusive, which make Markdown files easy to read. The file below uses several of the most useful markdown conventions.

Markdown is an easy to use format for writing reports. It resembles what you naturally write every time you compose an email. In fact, you may have already used markdown without realizing it. These websites all rely on markdown formatting

The file demonstrates how to use markdown to indicate:

  1. headers - Place one or more hashtags at the start of a line that will be a header (or sub-header). For example, # Say Hello to markdown. A single hashtag creates a first level header. Two hashtags, ##, creates a second level header, and so on.

  2. italicized and bold text - Surround italicized text with asterisks, like this *without realizing it*. Surround bold text with two asterisks, like this **easy to use**.

  3. lists - Group lines into bullet points that begin with asterisks. Leave a blank line before the first bullet, like this:

    This is a list

    • item 1
    • item 2
    • item 3
  4. hyperlinks - Surround links with brackets, and then provide the link target in parentheses, like this [Github](

    You can learn about more of markdown’s conventions in the Markdown Quick Reference guide, which comes with the RStudio IDE.

    To access the guide, open a .md or .Rmd file in RStudio. Then click the question mark that appears at the top of the scripts pane. Next, select “Markdown Quick Reference”. RStudio will open the Markdown Quick Reference guide in the Help pane.


To transform your markdown file into an HTML, PDF, or Word document, click the “Knit” icon that appears above your file in the scripts editor. A drop down menu will let you select the type of output that you want.

When you click the button, rmarkdown will duplicate your text in the new file format. rmarkdown will use the formatting instructions that you provided with markdown syntax.

Once the file is rendered, RStudio will show you a preview of the new output and save the output file in your working directory.

Here is how the markdown script above would look in each output format.

Note: RStudio does not build PDF and Word documents from scratch. You will need to have a distribution of Latex installed on your computer to make PDFs and Microsoft Word (or a similar program) installed to make Word files.

knitr for embedded R code

The knitr package extends the basic markdown syntax to include chunks of executable R code.

When you render the report, knitr will run the code and add the results to the output file. You can have the output display just the code, just the results, or both.


To embed a chunk of R code into your report, surround the code with two lines that each contain three backticks. After the first set of backticks, include {r}, which alerts knitr that you have included a chunk of R code. The result will look like this

When you render your document, knitr will run the code and append the results to the code chunk. knitr will provide formatting and syntax highlighting to both the code and its results (where appropriate).

We are running a spring boot application on tomcat server 8.5.5. We have security certificates and SSL configured for it to support https. Currently is uses TLSv1.2. Our payment gateway provider has plans to discontinue TLSv1.2 support and continue support for only TLSv1.3. Hence we want to add TLSv1.3 support to our application server. Tomcat documentation: SSL/TLS Configuration. HTTPS (also called HTTP over TLS,12 HTTP over SSL,3 and HTTP Secure45) is a protocol for secure communication over a computer network which is widely used on the Internet. Tomcat tls1 3.

As a result, the markdown snippet above will look like this when rendered (to HTML).

To omit the results from your final report (and not run the code) add the argument eval = FALSE inside the brackets and after r. This will place a copy of your code into the report.

To omit the code from the final report (while including the results) add the argument echo = FALSE. This will place a copy of the results into your report.

echo = FALSE is very handy for adding plots to a report, since you usually do not want to see the code that generates the plot.

echo and eval are not the only arguments that you can use to customize code chunks. You can learn more about formatting the output of code chunks at the rmarkdown and knitr websites.

Inline code

To embed R code in a line of text, surround the code with a pair of backticks and the letter r, like this.

knitr will replace the inline code with its result in your final document (inline code is always replaced by its result). The result will appear as if it were part of the original text. For example, the snippet above will appear like this:

YAML for render parameters

You can use a YAML header to control how rmarkdown renders your .Rmd file. A YAML header is a section of key: value pairs surrounded by --- marks, like below

The output: value determines what type of output to convert the file into when you call rmarkdown::render(). Note: you do not need to specify output: if you render your file with the RStudio IDE knit button.

R Shiny Markdown Pdf

output: recognizes the following values:

  • html_document, which will create HTML output (default)
  • pdf_document, which will create PDF output
  • word_document, which will create Word output

If you use the RStudio IDE knit button to render your file, the selection you make in the gui will override the output: setting.


R Shiny And Markdown

You can also use the output: value to render your document as a slideshow.

  • output: ioslides_presentation will create an ioslides (HTML5) slideshow
  • output: beamer_presentation will create a beamer (PDF) slideshow

Note: The knit button in the RStudio IDE will update to show slideshow options when you include one of the above output values and save your .Rmd file.

rmarkdown will convert your document into a slideshow by starting a new slide at each header or horizontal rule (e.g., ***).

Visit to learn about more YAML options that control the render process.

Shiny R Markdown


R Markdown documents provide quick, reproducible reporting from R. You write your document in markdown and embed executable R code chunks with the knitr syntax.

You can update your document at any time by re-knitting the code chunks.

You can then convert your document into several common formats.

R Markdown documents implement Donald’s Knuth’s idea of literate programming and take the manual labor out of writing and maintaining reports. Moreover, they are quick to learn. You already know ecnough about markdown, knitr, and YAML to begin writing your own R Markdown reports.

In the next article, Introduction to interactive documents, you will learn how to add interactive Shiny components to an R Markdown report. This creates a quick workflow for writing light-weight Shiny apps.

Shiny Dashboard R Markdown

To learn more about R Markdown and interactive documents, please visit

5.3 Shiny

By adding Shiny to a dashboard, you can let viewers change underlying parameters and see the results immediately, or let dashboards update themselves incrementally as their underlying data changes (see functions reactiveFileReader() and reactivePoll() in the shiny package). This is done by adding runtime: shiny to a standard dashboard document, and then adding one or more input controls and/or reactive expressions that dynamically drive the appearance of the components within the dashboard.

Using Shiny with flexdashboard turns a static R Markdown report into an interactive document. It is important to note that interactive documents need to be deployed to a Shiny Server to be shared broadly (whereas static R Markdown documents are standalone web pages that can be attached to emails or served from any standard web server).

Note that the shinydashboard package provides another way to create dashboards with Shiny.

5.3.1 Getting started

The steps required to add Shiny components to a dashboard are:

  1. Add runtime: shiny to the options declared at the top of the document (YAML metadata).

  2. Add the {.sidebar} attribute to the first column of the dashboard to make it a host for Shiny input controls (note that this step is not strictly required, but this will generate a typical layout for Shiny-based dashboards).

  3. Add Shiny inputs and outputs as appropriate.

  4. When including plots, be sure to wrap them in a call to renderPlot(). This is important not only for dynamically responding to changes, but also to ensure that they are automatically re-sized when their container changes.

5.3.2 A Shiny dashboard example

Here is a simple example of a dashboard that uses Shiny (see Figure 5.7 for the output):

FIGURE 5.7: An interactive dashboard based on Shiny.

The first column includes the {.sidebar} attribute and two Shiny input controls; the second column includes the Shiny code required to render the chart based on the inputs.

One important thing to note about this example is the chunk labeled global at the top of the document. The global chunk has special behavior within flexdashboard: it is executed only once within the global environment, so that its results (e.g., data frames read from disk) can be accessed by all users of a multi-user dashboard. Loading your data within a global chunk will result in substantially better startup performance for your users, and hence is highly recommended.

5.3.3 Input sidebar

You add an input sidebar to a flexdashboard by adding the {.sidebar} attribute to a column, which indicates that it should be laid out flush to the left with a default width of 250 pixels and a special background color. Sidebars always appear on the left no matter where they are defined within the flow of the document.

If you are creating a dashboard with multiple pages, you may want to use a single sidebar that applies across all pages. In this case, you should define the sidebar using a first-level Markdown header.

5.3.4 Learning more

Below are some good resources for learning more about Shiny and creating interactive documents:

  1. The official Shiny website ( includes extensive articles, tutorials, and examples to help you learn more about Shiny.

  2. The article “Introduction to Interactive Documents” on the Shiny website is a great guide for getting started with Shiny and R Markdown.

  3. For deploying interactive documents, you may consider Shiny Server or RStudio Connect: