---
title: "Markdown Basics"
output:
html_document:
toc_float: false
---
This document provides quick references to the most commonly used R Markdown syntax. See the following articles for more in-depth treatment of all the capabilities of R Markdown:
* [R Code Chunks](https://bookdown.org/yihui/rmarkdown/r-code.html)
* [Pandoc Markdown](authoring_pandoc_markdown.html)
#### Emphasis
```markdown
*italic* **bold**
_italic_ __bold__
```
#### Headers
```markdown
# Header 1
## Header 2
### Header 3
```
#### Lists
Unordered List:
```markdown
* Item 1
* Item 2
+ Item 2a
+ Item 2b
```
Ordered List:
```markdown
1. Item 1
2. Item 2
3. Item 3
+ Item 3a
+ Item 3b
```
#### R Code Chunks
R code will be evaluated and printed
```{r}
summary(cars$dist)
summary(cars$speed)
```
#### Inline R Code
```markdown
There were `r nrow(cars)` cars studied
```
#### Links
Use a plain http address or add a link to a phrase:
```markdown
http://example.com
[linked phrase](http://example.com)
```
#### Images
Images on the web or local files in the same directory:
```markdown
```
#### Blockquotes
```markdown
A friend once said:
> It's always better to give
> than to receive.
```
#### Plain Code Blocks
Plain code blocks are displayed in a fixed-width font but not evaulated
```
This text is displayed verbatim / preformatted
```
#### Inline Code
```markdown
We defined the `add` function to
compute the sum of two numbers.
LaTeX Equations
```
#### LaTeX Equations
Inline equation:
```markdown
$equation$
```
Display equation:
```markdown
$$ equation $$
```
#### Horizontal Rule / Page Break
Three or more asterisks or dashes:
```markdown
******
------
```
#### Tables
```markdown
First Header | Second Header
------------- | -------------
Content Cell | Content Cell
Content Cell | Content Cell
Reference Style Links and Images
```
#### Links
```markdown
A [linked phrase][id].
```
At the bottom of the document:
```markdown
[id]: http://example.com/ "Title"
```
#### Images
```markdown
![alt text][id]
```
At the bottom of the document:
```markdown
[id]: figures/img.png "Title"
```
#### Manual Line Breaks
End a line with two or more spaces:
```markdown
Roses are red,
Violets are blue.
```
#### Miscellaneous
```markdown
superscript^2^
~~strikethrough~~
```