Feature | .Rmd | .Rmarkdown | .md |
---|---|---|---|
Run R code | yes | yes | no |
Bibliography | yes | no | no |
Task list | maybe | yes | yes |
MathJax | yes | maybe | maybe |
HTML widgets | yes | no | no |
```{r}
). However, you can still embed R code in plain Markdown using the syntax for fenced code blocks ```r
(note there are no curly braces {}
). Such code blocks will not be executed and may be suitable for pure demonstration purposes. Below is an example of an R code chunk in R Markdown:_italic_
/ **bold**
text and `inline code`
.H~2~0
) and superscripts (e.g., R^2^
); links ([text](url)
) and images ![title](url)
; footnotes text^[footnote]
.<iframe>
.`$math$`
, e.g., `$S_n = sum_{i=1}^n X_i$`
. Similarly, math expressions of the display style have to be written in `$$math$$`
. For R Markdown posts, you can use $math$
for inline math expressions, and $$math$$
for display-style expressions.17*.Rmd
files into *.html
. You will also have intermediate folders for figures (*_files/
) and cache (*_cache/
) if you have plot output in R code chunks or have enabled knitr’s caching. Unless you care a lot about the “cleanness” of the source repository of your website (especially when you use a version control tool like GIT), these intermediate files should not matter..Rmd
files when we say “R Markdown documents,” which are compiled to .html
by default. However, there is another type of R Markdown document with the filename extension .Rmarkdown
. Such R Markdown documents are compiled to Markdown documents with the extension .markdown
, which will be processed by Hugo instead of Pandoc. There are two major limitations of using .Rmarkdown
compared to .Rmd
:.Rmarkdown
is that the output files are cleaner because they are Markdown files. It can be easier for you to read the output of your posts without looking at the actual web pages rendered. This can be particularly helpful when reviewing GitHub pull requests. Note that numbered tables, figures, equations, and theorems are also supported. You cannot directly use Markdown syntax in table or figure captions, but you can use text references as a workaround (see bookdown’s documentation).html_document
and pdf_document
) and other extension packages (such as tufte::tufte_html
and bookdown::gitbook
). Of course, the output format for websites should be HTML. We have provided an output format function blogdown::html_page
in blogdown, and all R Markdown files are rendered using this format. It is based on the output format bookdown::html_document2
, which means it has inherited a lot of features from bookdown in addition to features in Pandoc. For example, you can number and cross-reference math equations, figures, tables, and theorems, etc. See Chapter 2 of the bookdown book (Xie 2016) for more details on the syntax.bookdown::html_document2
in turn inherits from rmarkdown::html_document
, so you need to see the help page ?rmarkdown::html_document
for all possible options for the format blogdown::html_page
. If you want to change the default values of the options of this output format, you can add an output
field to your YAML metadata. For example, we can add a table of contents to a page, set the figure width to be 6 inches, and use the svg
device for plots by setting these options in YAML:blogdown::html_page()
globally (i.e., apply certain options to all Rmd files), you can create a _output.yml
file under the root directory of your website. This YAML file should contain the output format directly (do not put the output format under the output
option), e.g.,rmarkdown::html_document
are supported in blogdown, such as df_print
, code_folding
, code_download
, and so on.```{r, my-label}
instead of ```{r, my label}
.fig.path
or cache.path
in R Markdown. The default values of these options work best with blogdown. Please read Section D.5 to know the technical reasons if you prefer..Rmd
to another unknown extension such as .Rmkd
.**
, to display the enclosed text in boldface.*
, to display the enclosed text in italics.`
.``
.
character should be escaped appropriately if the text is embedded in a Julia source code, for example, '``LaTeX`` syntax in a docstring.'
, since it is interpreted as a string literal. Alternatively, in order to avoid escaping, it is possible to use the raw
string macro together with the @doc
macro:[ ]
, is the name of the link and the text enclosed in parentheses, ( )
, is the URL.parse
documentation (which has more information about what this function actually does), and to the nothing
documentation. It's good to include cross references to mutating/non-mutating versions of a function, or to highlight a difference between two similar-seeming functions.>
characters prepended to each line of the quote as follows.>
character on each line. Quoted blocks may themselves contain other toplevel or inline elements.!
character to a link will display an image from the specified URL rather than a link to it.*
, +
, or -
.*
and the single space after each one.i
in item two
.*
, +
, or -
, with a positive integer followed by either .
or )
.math
as in the example below.:
character that is appended to the footnote label.<hr>
HTML tag can be achieved using three hyphens (---
). For example:|
characters must be aligned vertically.:
character on either end of a column's header separator (the row containing -
characters) specifies whether the row is left-aligned, right-aligned, or (when :
appears on both ends) center-aligned. Providing no :
characters will default to right-aligning the column.!!!
syntax:danger
, warning
, info
, note
, and tip
.danger
, warning
.. etc_, if no title text is specified after the admonition type, then the type title used will be the type of the block. E.g. 'Note'
in the case of the note
admonition.terminology
block used like so:show
methods will be called, and these can be overridden as usual. This design allows the Markdown to be extended with arbitrarily complex features (such as references) without cluttering the basic syntax.