# A Minimal Example for Markdown This is a minimal example of using **knitr** to produce an _HTML_ page from _Markdown_. ## R code chunks ```{r setup} # set global chunk options: images will be 7x5 inches opts_chunk$set(fig.width=7, fig.height=5) ``` Now we write some code chunks in this markdown file: ```{r computing} x <- 1+1 # a simple calculator set.seed(123) rnorm(5) # boring random numbers ``` We can also produce plots: ```{r graphics} par(mar = c(4, 4, .1, .1)) with(mtcars, { plot(mpg~hp, pch=20, col='darkgray') lines(lowess(hp, mpg)) }) ``` ## Inline code Inline R code is also supported, e.g. the value of `x` is `r x`, and 2 × π = `r 2*pi`. ## Math LaTeX math as usual: $f(\alpha, \beta) \propto x^{\alpha-1}(1-x)^{\beta-1}$. ## Misc You can indent code chunks so they can nest within other environments such as lists. 1. the area of a circle with radius x ```{r foo} pi * x^2 ``` 2. OK, that is great To compile me, use ```{r compile, eval=FALSE} library(knitr) knit('knitr-minimal.Rmd') ``` ## Conclusion Markdown is super easy to write. Go to **knitr** [homepage](http://yihui.name/knitr) for details.

# set global chunk options: images will be 7x5 inches
opts_chunk$set(fig.width = 7, fig.height = 5)

x <- 1 + 1  # a simple calculator
set.seed(123)
rnorm(5)  # boring random numbers

## [1] -0.56048 -0.23018  1.55871  0.07051  0.12929

  par(mar = c(4, 4, 0.1, 0.1))
with(mtcars, {
  plot(mpg ~ hp, pch = 20, col = "darkgray")
  lines(lowess(hp, mpg))
})

pi * x^2

## [1] 12.57

library(knitr)
knit("knitr-minimal.Rmd")