044-size.Rnw

\documentclass{article}

\begin{document}

The size option controls the font size of chunks. This is the default size:

<<>>=
head(iris)
@

This is scriptsize:

<<size='scriptsize'>>=
head(iris)
@

The size does not work when results = 'asis':

<<test-asis, size='small', results='asis'>>=
cat(letters, sep = ' ')
@

But you can use a hook to add the size environment in this case:

<<setup, include=FALSE>>=
library(knitr)
knit_hooks$set(size = function(before, options, envir) {
  # bring back the size environment when results='asis'
  if (options$results != 'asis') return()
  paste('\\end{kframe}',
        sprintf(if (before) '\\begin{%s}' else '\\end{%s}', options$size),
        '\\begin{kframe}', sep = '')
})
@

<<ref.label='test-asis', size='scriptsize', results='asis'>>=
@

Move on!

\end{document}