customize the knitrout environment

knitrout-parskip.Rnw

\documentclass{article}

% change the space between paragraphs in chunks

\parindent = 0.0in
\parskip = 0.125in
\ifdefined\knitrout
  \renewenvironment{knitrout}{
    \setlength{\parskip}{0in}
  }{
    \setlength{\parskip}{0.125in}
  }
\else
\fi

\begin{document}

The quick brown fox jumps over the lazy dog the quick brown fox jumps over the
lazy dog the quick brown fox jumps over the lazy dog.

The quick brown fox jumps over the lazy dog the quick brown fox jumps over the
lazy dog the quick brown fox jumps over the lazy dog.

<<test>>=
1+1
rnorm(30)
@

The quick brown fox jumps over the lazy dog the quick brown fox jumps over the
lazy dog the quick brown fox jumps over the lazy dog.

The quick brown fox jumps over the lazy dog the quick brown fox jumps over the
lazy dog the quick brown fox jumps over the lazy dog.

\end{document}

knitrout-vspace.Rnw

\documentclass{article}

% decrease the space before and after the chunk output environment
% (use negative vertical space)

\ifdefined\knitrout
  \renewenvironment{knitrout}{
    \vspace{-1em}
  }{
    \vspace{-1em}
  }
\else
\fi

\begin{document}

The quick brown fox jumps over the lazy dog the quick brown fox jumps over the
lazy dog the quick brown fox jumps over the lazy dog.

The quick brown fox jumps over the lazy dog the quick brown fox jumps over the
lazy dog the quick brown fox jumps over the lazy dog.

<<test>>=
1+1
rnorm(30)
@

The quick brown fox jumps over the lazy dog the quick brown fox jumps over the
lazy dog the quick brown fox jumps over the lazy dog.

The quick brown fox jumps over the lazy dog the quick brown fox jumps over the
lazy dog the quick brown fox jumps over the lazy dog.

\end{document}