Stat 506 knitR

knitr requires R 2.14.0 or better.
It will be supported in the next version of RStudio

install.packages('knitr', dep=T)
require(knitr)
knit("myfile.Rnw")             ## build   myfile.tex
system("pdflatex myfile.tex")  ## process it to make the pdf
purl("myfile.Rnw")             ## extract R code into myfile.R

Options

• To decrease font size, redefine knitrout environment in the document header.

• Set a default size for figures

  \ifdefined\knitrout
    \renewenvironment{knitrout}{\begin{footnotesize}}{\end{footnotesize}}
   \else
  \fi
  
  \SweaveOpts{fig.width=4, fig.height=4}
  
  \begin{document}

• Code chunk options:

  <<bwplot, fig=T, dev=pdf, fig.width=10, fig.height=4, out.height=.5\linewidth, out.width=.95\linewidth, cache =T>>=
    data(singer)
    bwplot(voice.part ~ height, data=singer, xlab="Height (inches)")
  @ 

  Do not need to put lattice and ggplot commands within a print(...) call as in Sweave.
  Choose from many devices (png or tikz, for example)
  Set fig.height and fig.width to get axis labels to be right proportional to plot window size. Smaller numbers make labels bigger.
  out.height and out.width relative to \linewidth or \textwidth to get settings on the page.
  Use cache=TRUE to avoid repeatedly computing the same values.

• Appendix: they sat to do this to show the code chunk from above.

  << ref.label=bwplot,  echo=TRUE, results=markup>>=
  @

  That does repeat the code, but also reruns it.

• I would like to make code wrap at a larger number. Haven't figured that out yet.