---
title: "Our First R Notebook"
output:
  pdf_document: default
  html_document:
    df_print: paged
  word_document: default
---

This is an [R Markdown](http://rmarkdown.rstudio.com) Notebook. When you execute code within the notebook, the results appear beneath the code. 

Try executing this chunk by clicking the *Run* button within the chunk or by placing your cursor inside it and pressing *Cmd+Shift+Enter*. 

```{r}
plot(cars)
```

Add a new chunk by clicking the *Insert Chunk* button on the toolbar or by pressing *Cmd+Option+I*.

```{r}
v=c(2,3)
#now I calculate the arithmetic average
mean(v)
```

# Title
## Smaller title

This is a list

- item 1
- item 2
- item 3

This is the *density of the standard normal distribution*
$$
\varphi(z) = \frac{1}{\sqrt{2\pi}}e^{-\tfrac{z^2}{2}}, \quad z \in \mathbb{R}
$$

When you save the notebook, an HTML file containing the code and output will be saved alongside it (click the *Preview* button or press *Cmd+Shift+K* to preview the HTML file). 

The preview shows you a rendered HTML copy of the contents of the editor. Consequently, unlike *Knit*, *Preview* does not run any R code chunks. Instead, the output of the chunk when it was last run in the editor is displayed.