Format for converting from R Markdown to an ioslides presentation.
ioslides_presentation(
number_sections = FALSE,
logo = NULL,
slide_level = 2,
incremental = FALSE,
fig_width = 7.5,
fig_height = 4.5,
fig_retina = 2,
fig_caption = TRUE,
dev = "png",
df_print = "default",
smart = TRUE,
self_contained = TRUE,
widescreen = FALSE,
smaller = FALSE,
transition = "default",
math_method = "mathjax",
mathjax = "default",
analytics = NULL,
template = NULL,
css = NULL,
includes = NULL,
keep_md = FALSE,
lib_dir = NULL,
md_extensions = NULL,
pandoc_args = NULL,
extra_dependencies = NULL,
...
)R Markdown output format to pass to render().
TRUE to number section headings
Path to file that includes a logo for use in the presentation (should be square and at least 128x128).
Header level to consider as slide separator (Defaults to header 2).
TRUE to render slide bullets incrementally.
Note that if you want to reverse the default incremental behavior for an
individual bullet you can preceded it with >.
For example: > - Bullet Text.
Default width (in inches) for figures
Default height (in inches) for figures
Scaling to perform for retina displays (defaults to 2, which
currently works for all widely used retina displays). Set to NULL to
prevent retina scaling. Note that this will always be NULL when
keep_md is specified (this is because fig_retina relies on
outputting HTML directly into the markdown document).
TRUE to render figures with captions
Graphics device to use for figure output (defaults to png)
Method to be used for printing data frames. Valid values
include "default", "kable", "tibble", and "paged". The "default" method
uses a corresponding S3 method of print, typically
print.data.frame. The "kable" method uses the
knitr::kable function. The "tibble" method uses
the tibble package to print a summary of the data frame. The "paged"
method creates a paginated HTML table (note that this method is only valid
for formats that produce HTML). In addition to the named methods you can
also pass an arbitrary function to be used for printing data frames. You
can disable the df_print behavior entirely by setting the option
rmarkdown.df_print to FALSE. See
Data
frame printing section in bookdown book for examples.
Produce typographically correct output, converting straight
quotes to curly quotes, --- to em-dashes, -- to en-dashes, and
... to ellipses.
Produce a standalone HTML file with no external dependencies, using data: URIs to incorporate the contents of linked scripts, stylesheets, images, and videos. Note that even for self contained documents MathJax is still loaded externally (this is necessary because of its size).
Display presentation with wider dimensions.
Use smaller text on all slides. You can also enable this for
individual slides by adding the .smaller attribute to the slide
header (see Presentation Size below for details).
Speed of slide transitions. This can be "default", "slower", "faster", or a numeric value with a number of seconds (e.g. 0.5).
Math rendering engine to use. This will define the math method to use with Pandoc.
It can be a string for the engine, one of "mathjax", "mathml", "webtex", "katex", "gladtex", or "r-katex"
or "default" for mathjax.
It can be a list of
engine: one of
"mathjax", "mathml", "webtex", "katex", or "gladtex".
url: A specific url to use with mathjax, katex or webtex.
Note that for engine = "mathjax", url = "local" will use a local version of MathJax (which is
copied into the output directory).
For example,
output:
html_document:
math_method:
engine: katex
url: https://cdn.jsdelivr.net/npm/katex@0.11.1/dist
See Pandoc's Manual about Math in HTML for the details about Pandoc supported methods.
Using math_method = "r-katex" will opt-in server side rendering using
KaTeX thanks to katex R package. This is
useful compared to math_method = "katex" to have no JS dependency, only a
CSS dependency for styling equation.
Include mathjax. The "default" option uses an https URL from a
MathJax CDN. The "local" option uses a local version of MathJax (which is
copied into the output directory). You can pass an alternate URL or pass
NULL to exclude MathJax entirely.
A Google analytics property ID.
Pandoc template to use for rendering. Pass "default" to use
the rmarkdown package default template; pass NULL to use pandoc's
built-in template; pass a path to use a custom template that you've created.
Note that if you don't use the "default" template then some features of
html_document won't be available (see the Templates section below for
more details).
One or more css files to include.
Named list of additional content to include within the
document (typically created using the includes function).
Keep the markdown file generated by knitting.
Directory to copy dependent HTML libraries (e.g. jquery,
bootstrap, etc.) into. By default this will be the name of the document with
_files appended to it.
Markdown extensions to be added or removed from the
default definition of R Markdown. See the rmarkdown_format for
additional details.
Additional command line options to pass to pandoc
Extra dependencies as a list of the
html_dependency class objects typically generated by
htmltools:htmlDependency().
Additional function arguments to pass to the base R Markdown HTML
output formatter html_document_base
You can create a slide show broken up into sections by using the # and ##
heading tags (you can also create a new slide without a header using a
horizontal rule (----------). For example here's a simple slide show:
---
title: "Habits"
author: John Doe
date: March 22, 2005
output: ioslides_presentation
---# In the morning
## Getting up
- Turn off alarm
- Get out of bed
## Breakfast
- Eat eggs
- Drink coffee
# In the evening
## Dinner
- Eat spaghetti
- Drink wine
----------
## Going to sleep
- Get in bed
- Count sheep
You can add a subtitle to a slide or section by including text after the pipe (|) character. For example:
## Getting up | What I like to do first thing
The following single character keyboard shortcuts enable alternate display modes:
'f' enable fullscreen mode
'w' toggle widescreen mode
'o' enable overview mode
'h' enable code highlight mode
'p' show presenter notes
Pressing Esc exits all of these modes. See the sections below on
Code Highlighting and Presenter Mode for additional
detail on those modes.
You can render bullets incrementally by adding the incremental
option:
---
output:
ioslides_presentation:
incremental: true
---
If you want to render bullets incrementally for some slides but not others you can use this syntax:
> - Eat eggs
> - Drink coffee
You can display the presentation using a wider form factor using the
widescreen option. You can specify that smaller text be used with
the smaller option. For example:
---
output:
ioslides_presentation:
widescreen: true
smaller: true
---
You can also enable the smaller option on a slide-by-slide basis
by adding the .smaller attribute to the slide header:
## Getting up {.smaller}
You can add a logo to the presentation using the logo option (the
logo should be square and at least 128x128). For example:
---
output:
ioslides_presentation:
logo: logo.png
---
A 128x128 version of the logo graphic will be added to the title slide and an icon version of the logo will be included in the bottom-left footer of each slide.
Slides can also have a .build attribute that indicate that their
content should be displayed incrementally. For example:
## Getting up {.build}
Slide attributes can be combined if you need to specify more than one, for example:
## Getting up {.smaller .build}
It's possible to select subsets of code for additional emphasis by adding a special "highlight" comment around the code. For example:
### <b>
x <- 10
y <- x * 2
### </b>
The highlighted region will be displayed with a bold font. When you want to
help the audience focus exclusively on the highlighted region press the
'h' key and the rest of the code will fade away.
The ioslides template has an attractive default style for tables so you shouldn't hesitate to add tables for presenting more complex sets of information. Pandoc markdown supports several syntaxes for defining tables which are described in the pandoc online documentation.
You can center content on a slide by adding the .flexbox
and .vcenter attributes to the slide title. For example:
## Dinner {.flexbox .vcenter}
You can horizontally center content by enclosing it in a div tag
with class centered. For example:
<div class="centered">
This text is centered.
</div>
You can do a two-column layout using the columns-2 class.
For example:
<div class="columns-2">
 - Bullet 1
- Bullet 2
- Bullet 3
</div>
Note that content will flow across the columns so if you want to have an image on one side and text on the other you should make sure that the image has sufficient height to force the text to the other side of the slide.
You can color content using base color classes red, blue, green, yellow, and gray (or variations of them e.g. red2, red3, blue2, blue3, etc.). For example:
<div class="red2">
This text is red
</div>
A separate presenter window can also be opened (ideal for when you are
presenting on one screen but have another screen that's private to you).
The window stays in sync with the main presentation window and also
shows presenter notes and a thumbnail of the next slide. To enable
presenter mode add ?presentme=true to the URL of the presentation,
for example:
mypresentation.html?presentme=true
The presenter mode window will open and will always re-open with the presentation until it's disabled with:
mypresentation.html?presentme=false
To add presenter notes to a slide you include it within a "notes"
div. For example:
<div class="notes">
This is my *note*.- It can contain markdown
- like this list
</div>
You can print an ioslides presentation from within browsers that have good support for print CSS (i.e. as of this writing Google Chrome has the best support). Printing maintains most of the visual styles of the HTML version of the presentation.
To create a PDF version of a presentation you can use Print to PDF from Google Chrome.
See the online documentation for additional details on using the
ioslides_presentation format.
Note that, if a before_body include is specified in includes,
then it will replace the standard title slide entirely.
Regarding previewing slide in RStudio IDE, ioslides_presentation() will
always open preview in a new Window and the RStudio IDE configuration "Open in Viewer
Pane" will have no effect for this format.