library(knitr) opts_chunk$set(fig.width = 5, fig.height = 5)

This is a minimal example which shows **knitr**
working with HTML
pages. See here
for the output and
here
for the source.

Boring stuff as usual:

## a simple calculator 1 + 1

## [1] 2

## boring random numbers set.seed(123) rnorm(5)

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

We can also produce plots (centered by the
option `fig.align='center'`

):

library(ggplot2) plot(mpg ~ hp, mtcars)

qplot(hp, mpg, data = mtcars) + geom_smooth()

Errors, messages and warnings can be put into `div`

's
with different `class`

es:

sqrt(-1) # warning

## Warning in sqrt(-1): NaNs produced

## [1] NaN

message("knitr says hello to HTML!")

1 + "a" # mission impossible

## Error in 1 + "a": non-numeric argument to binary operator

In the end, let's show off a 3D plot from
the **rgl** package.

library(rgl) knit_hooks$set(rgl = hook_rgl) # set up the hook first

demo("bivar", package = "rgl", echo = FALSE) par3d(zoom = 0.7)

Well, everything seems to be working. Let's ask R what is the
value of π? Of course it is `3.1416`

.