4.2 Slidy presentation
To create a Slidy presentation from R Markdown, you specify the slidy_presentation output format in the YAML metadata of your document. You can create a slide show broken up into sections by using the ## heading tag (you can also create a new slide without a header using a horizontal rule (---). For example, here is a simple slide show (see Figure 4.2 for two sample slides):
---
title: "Habits"
author: John Doe
date: March 22, 2005
output: slidy_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
---
```{r, cars, fig.cap="A scatterplot.", echo=FALSE}
plot(cars)
```
## Going to sleep
- Get in bed
- Count sheep
FIGURE 4.2: Two sample slides in a Slidy presentation.
4.2.1 Display modes
The following single character keyboard shortcuts enable alternate display modes:
'C': Show table of contents (the right sub-figure in Figure 4.2 has shown the table of contents).'F': Toggles the display of the footer.'A': Toggles display of current vs all slides (useful for printing handouts).'S': Make fonts smaller.'B': Make fonts larger .
4.2.2 Text size
You can use the font_adjustment option to increase or decrease the default font size (e.g., -1 or +1) for the entire presentation. For example:
---
output:
slidy_presentation:
font_adjustment: -1
---If you want to decrease the text size on an individual slide you can use the .smaller slide attribute. For example:
## Getting up {.smaller}If you want to increase the text size on an individual slide you can use the .bigger slide attribute. For example:
## Getting up {.bigger}You can also manually adjust the font size during the presentation using the 'S' (smaller) and 'B' (bigger) keys.
4.2.4 Other features
Refer to Section 3.1 for the documentation of other features of Slidy presentations, including figure options (Section 3.1.5), appearance and style (Section 3.1.4), MathJax equations (Section 3.1.8), data frame printing (Section 3.1.6), Markdown extensions (Section 3.1.10.4), keeping Markdown (Section 3.1.10.1), document dependencies (Section 3.1.9), header and before/after body inclusions (Section 3.1.10.2), custom templates (Section 3.1.10.3), Pandoc arguments (Section 3.1.10.5), and shared options (Section 3.1.11).
Slidy presentations have several features in common with ioslides presentations in Section 4.1. For incremental bullets, see Section 4.1.2. For custom CSS, see Section 4.1.3.5. For printing Slidy slides to PDF, see Section 4.1.10.