Test

just code formatted

and some R code

xx <- rnorm(2000)
paste("length of xx:", length(xx))
plot(xx)

ok italic and $\tfrac{1}{997} = `r 1/997`$ .

right hand side

link to google.

and a table

library(knitr)
kable(mtcars[1:15, ], caption = "this is a knitr kable.")