Stat 506 knitR

knitr requires R 2.14.0 or better.
It is now supported in the RStudio. In your Tools :: Options sclick Sweave and choose "Weave Rnw files with : knitr

install.packages('knitr', dep=T)

Options

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

  \ifdefined\knitrout
  \renewenvironment{knitrout}{\begin{footnotesize}}{\end{footnotesize}}
   \else
  \fi

• I also insert this at the top of my document as the first code chunk

  <<setup, echo=F,results=hide>>=
  opts_chunk$set(fig.width=5, fig.height=4, out.width='.5\\linewidth',
  dev='pdf', concordance = TRUE)
  options(width=88, max.print="70", replace.assign=TRUE, digits=3, show.signif.stars=FALSE)
  @

  Note: Code chunks MUST start and stop on the far left of a line!

  In this html document you see them indented, but that will not work in the Rnw file.

• Code chunk options:

  <<bwplot, fig=T, dev=pdf, fig.width=10, fig.height=4,  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: to rerun the code and show output, refer to the same label created above.

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

  That repeats the code, and reruns it. Use eval=FALSE to omit results.

knitR website