# How to modify knitr output chunk

I know that it's possible to tweak the output of a knitr code chunk so that it looks the way you want. My problem occurs when using the parskip package. The parskip package adds an extra bit of space below the code output, which doesn't look great. Here's a minimal .Rnw file.

\documentclass[11pt]{article}
\usepackage[utf8]{inputenc}
\usepackage[margin=1in]{geometry}
\usepackage{parskip}

\begin{document}
\setlength{\parindent}{0in}
Some text above chunk
<<echo=TRUE>>=
2 + 2
@
Some text below. The space above this is too big when using the \texttt{parskip} package.
Some text below. The space above this is too big when using the \texttt{parskip} package.
Some text below. The space above this is too big when using the \texttt{parskip} package.

A nice space between paragraphs.
\end{document}

• In a Debian with TeX Live 2014 I am unable to see in your example the extra space between the R box and "Some text..." when using parskip (at the same time that I see the extra space above "A nice space...", so there are not doubt that I was using the package). – Fran Mar 5 '15 at 19:54

This not an elegant answer but you can 'fix' the excess space with the inclusion of negative vertical space. See the modified code.

\documentclass[11pt]{article}
\usepackage[utf8]{inputenc}
\usepackage[margin=1in]{geometry}
%\usepackage{parskip}

\begin{document}
\setlength{\parindent}{0in}
Some text above chunk
<<echo=TRUE>>=
2 + 2
@
\vspace{-1em}  %%% this moves the following text up the height of an 'm'
Some text below. The space above this is too big when using the \texttt{parskip} package.
Some text below. The space above this is too big when using the \texttt{parskip} package.
Some text below. The space above this is too big when using the \texttt{parskip} package.

A nice space between paragraphs.
\end{document}