# Vertical Centering in a multicols

In a document I have several multicols units, in which on one side there is an image and on the other side some information in a itemize.

Now, depending on the image / information, the two "sections" vary in their vertical size. Is there a possibility to center both parts inside that multicols unit?

For example I have

\begin{multicols}{2}
\begin{figure}[H]
\includegraphics[scale=0.7]{1bitalu.png}
\end{figure}

\vfill
\columnbreak

\begin{itemize}
\item "Arithmetic Logical Unit" für mehrere Rechenarten
\item Addition, Subtraktion, logisches AND / OR, Vergleich etc.
\item Parallele "Berechnung" aller Operationen
\item Selektion mit einem "Multiplexer"
\item Selektion durch die Kontrolleinheit (Control Unit)
\end{itemize}
\end{multicols}


which results in

but I want to have it like this

Is there an easy way to achieve this?

-

Here are two options, using multicol or array's m{<len>} column specification:

\documentclass{article}
\usepackage{graphicx,multicol}% http://ctan.org/pkg/{graphicx,multicol}
\usepackage{array}% http://ctan.org/pkg/array
\begin{document}
\begin{multicols}{2}
\null \vfill
\includegraphics[width=.8\columnwidth]{example-image-a}

\vfill \null
\columnbreak

\begin{itemize}
\item Arithmetic Logical Unit'' f\"ur mehrere Rechenarten
\item Addition, Subtraktion, logisches AND / OR, Vergleich etc.
\item Parallele Berechnung'' aller Operationen
\item Selektion mit einem Multiplexer''
\item Selektion durch die Kontrolleinheit (Control Unit)
\end{itemize}
\end{multicols}

\noindent
\begin{tabular}{@{}m{\dimexpr.5\textwidth-.5\columnsep}m{\dimexpr.5\textwidth-.5\columnsep}@{}}
\centering\includegraphics[width=.8\linewidth]{example-image-a} &
\begin{itemize}
\item Arithmetic Logical Unit'' f\"ur mehrere Rechenarten
\item Addition, Subtraktion, logisches AND / OR, Vergleich etc.
\item Parallele Berechnung'' aller Operationen
\item Selektion mit einem Multiplexer''
\item Selektion durch die Kontrolleinheit (Control Unit)
\end{itemize}
\end{tabular}
\end{document}


An m{<len>} column specification centers its content by placing the "anchor" in the middle vertically.

-
What is \null doing? – azetina Dec 11 '12 at 0:45
@azetina: \null is defined in the LaTeX kernel latex.ltx as \def\null{\hbox{}}. It initiates horizontal mode, and therefore puts something on a line. Since vertical filling sometimes require "end points" in order to stretch, using \null is a viable option. It may not be necessary here, but it doesn't hurt. – Werner Dec 11 '12 at 0:51
What other possibilities are there? Is \leavevmode one? – azetina Dec 11 '12 at 0:53
@azetina: You can use \leavevmode, or \mbox{}. Not sure whether this answers your question. – Werner Dec 11 '12 at 1:01
@Werner this is technically not quite correct: \null does not initiate horizontal mode, it stays in whatever mode you are in. All it does is to add an empty \hbox to the current mode which in this case is v-mode. It works alright in this case but this fact makes it a bit dangerous. The "LaTeX" way would probably be \vspace*{\stretch{1}} or \mbox{}\vfill – Frank Mittelbach Jan 3 '13 at 16:57