[R] Understanding the workflow between sweave, R and Latex

[syrvn]

Let's say I have written the following tiny .Rnw file:

_________________________________________
\documentclass{article}

\usepackage[utf8]{inputenc}

\usepackage{Sweave}

\usepackage{tikz}

\usepackage{pgf}

\begin{document}

<<>>=

sessionInfo()

@

\end{document}
_________________________________________

I then can go to R and use sweave to translate the .Rnw file into a .tex
file

Once this is done the latex interpreter can be called and because I used

\usepackage{Sweave} Latex knows how to handle the sweave specific code tags.

When I first did this procedure I got the commong error that the Sweave.sty
file could

not be found. I googled and could solve the problem by typing the following
command

into the Mac OS Terminal:

_________________________________________
mkdir -p ~/Library/texmf/tex/latex

cd ~/Library/texmf/tex/latex

ln -s /Library/Frameworks/R.framework/Resources/share/texmf Sweave
_________________________________________

What I don't understand now is how does the latex package
\usepackage{Sweave} know that it

has to look at ~/Library/texmf/tex/latex to find the symbolic link to the
Sweave.sty file?

What happens if I change the following line:

ln -s /Library/Frameworks/R.framework/Resources/share/texmf Sweave

to

ln -s /Library/Frameworks/R.framework/Resources/share/texmf Sweave_Link

In the .Rnw file do I have to use then \usepackage{Sweave_Link}?

Best regards,

syrvn

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