Render the input file to the specified output format using pandoc. If the
input requires knitting then knit is called prior
to pandoc.
render(
input,
output_format = NULL,
output_file = NULL,
output_dir = NULL,
output_options = NULL,
output_yaml = NULL,
intermediates_dir = NULL,
knit_root_dir = NULL,
runtime = c("auto", "static", "shiny", "shinyrmd", "shiny_prerendered"),
clean = TRUE,
params = NULL,
knit_meta = NULL,
envir = parent.frame(),
run_pandoc = TRUE,
quiet = FALSE,
encoding = "UTF-8"
)When run_pandoc = TRUE, the compiled document is written into
the output file, and the path of the output file is returned. When
run_pandoc = FALSE, the path of the Markdown output file, with
attributes knit_meta (the knitr meta data collected from code
chunks) and intermediates (the intermediate files/directories
generated by render()).
The input file to be rendered. This can be an R script (.R), an R Markdown document (.Rmd), or a plain markdown document.
The R Markdown output format to convert to. The option
"all" will render all formats defined within the file. The option can
be the name of a format (e.g. "html_document") and that will render
the document to that single format. One can also use a vector of format
names to render to multiple formats. Alternatively, you can pass an output
format object (e.g. html_document()). If using NULL then the
output format is the first one defined in the YAML frontmatter in the input
file (this defaults to HTML if no format is specified there).
If you pass an output format object to output_format, the options
specified in the YAML header or _output.yml will be ignored and you
must explicitly set all the options you want when you construct the object.
If you pass a string, the output format will use the output parameters in
the YAML header or _output.yml.
The name of the output file. If using NULL then the
output filename will be based on filename for the input file. If a filename
is provided, a path to the output file can also be provided. Note that the
output_dir option allows for specifying the output file path as well,
however, if also specifying the path, the directory must exist. If
output_file is specified but does not have a file extension, an
extension will be automatically added according to the output format. To
avoid the automatic file extension, put the output_file value in
I(), e.g., I('my-output').
The output directory for the rendered output_file.
This allows for a choice of an alternate directory to which the output file
should be written (the default output directory of that of the input file).
If a path is provided with a filename in output_file the directory
specified here will take precedence. Please note that any directory path
provided will create any necessary directories if they do not exist.
List of output options that can override the options
specified in metadata (e.g. could be used to force self_contained or
mathjax = "local"). Note that this is only valid when the output
format is read from metadata (i.e. not a custom format object passed to
output_format).
Paths to YAML files specifying output formats and their
configurations. The first existing one is used. If none are found, then
the function searches YAML files specified to the output_yaml top-level
parameter in the YAML front matter, _output.yml or _output.yaml, and then uses
the first existing one.
Intermediate files directory. If a path is specified
then intermediate files will be written to that path. If NULL,
intermediate files are written to the same directory as the input file.
The working directory in which to knit the document;
uses knitr's root.dir knit option. If NULL then the behavior
will follow the knitr default, which is to use the parent directory of the
document.
The runtime target for rendering. The static option
produces output intended for static files; shiny produces output
suitable for use in a Shiny document (see run). The default,
auto, allows the runtime target specified in the YAML metadata
to take precedence, and renders for a static runtime target otherwise.
Using TRUE will clean intermediate files that are created
during rendering.
A list of named parameters that override custom params
specified within the YAML front-matter (e.g. specifying a dataset to read or
a date range to confine output to). Pass "ask" to start an
application that helps guide parameter configuration.
(This option is reserved for expert use.) Metadata generated by knitr.
The environment in which the code chunks are to be evaluated
during knitting (can use new.env() to guarantee an empty new
environment).
An option for whether to run pandoc to convert Markdown output.
An option to suppress printing during rendering from knitr,
pandoc command line and others. To only suppress printing of the last
"Output created: " message, you can set rmarkdown.render.message to
FALSE
Ignored. The encoding is always assumed to be UTF-8.
R Markdown supports all of the base pandoc markdown features as well as some
optional features for compatibility with GitHub Flavored Markdown (which
previous versions of R Markdown were based on). See
rmarkdown_format for details.
Note that the knitr error option is set to FALSE during
rendering (which is different from the knitr default value of
TRUE).
For additional details on rendering R scripts see Compiling R scripts to a notebook.
If no output_format parameter is specified then the output format is
read from the YAML front-matter of the input file. For example, the
following YAML would yield a PDF document:
output: pdf_document
Additional format options can also be specified in metadata. For example:
output:
pdf_document:
toc: true
highlight: zenburn
Multiple formats can be specified in metadata. If no output_format
is passed to render then the first one defined will be used:
output:
pdf_document:
toc: true
highlight: zenburn
html_document:
toc: true
theme: united
Formats specified in metadata can be any one of the built in formats (e.g.
html_document, pdf_document) or a format defined
in another package (e.g. pkg::custom_format).
If there is no format defined in the YAML then
html_document will be used.
knit, output_format, https://pandoc.org
if (FALSE) {
library(rmarkdown)
# Render the default (first) format defined in the file
render("input.Rmd")
# Render all formats defined in the file
render("input.Rmd", "all")
# Render a single format, using parameters for \code{html_document} from
# the YAML header parameters.
render("input.Rmd", "html_document")
# Render a single format, ignoring parameters for \code{html_document} in
# the YAML header. Any parameters not passed as arguments to
# \code{html_document()} will be assigned to their default values, regardless
# of anything in the YAML header
render("input.Rmd", html_document(toc = TRUE, toc_depth = 2))
# Render multiple formats
render("input.Rmd", c("html_document", "pdf_document"))
}
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