How to put R code into a parameter of a newcommand?

Question

I would like to put R code into a parameter of a newcommand in LaTeX. To do it, I make the following:

%Define the newcommand:
\newcommand\solution[1]{\sf #1}

%Then, after the \begin{document}, I write:

\solution{
<<echo=T>>=
x=rnorm(100)
@
}

in my .Rnw file. After I do R CMD Sweave file.Rnw, all is OK but when I do pdflatex file.tex, the response is:

! FancyVerb Error:
  Extraneous input `> x=rnorm(100) \end {Sinput} \end {Schunk} ' between \begin
{Sinput}[<key=value>] and line end
.
\FV@Error ... {FancyVerb Error:
\space \space #1
}

l.12 }

Somebody can help me?

Answer 1

The chunks are verbatim like structures, thus cannot be used inside \macro{....}, make a solution environment instead (BTW use \sfseries, not \sf)

You might get away with just

\newenvironment{solution}{\sffamily}{}

\begin{solution}
<<echo=T>>=
x=rnorm(100)
@
\end{solution}