[Tex/LaTex] How to center column values in a table

horizontal alignmenttables

How can I center the column values in this code?

\documentclass[conference]{IEEEtran}
\begin{document}
\begin{table}
  \centering
  \begin{tabular}{|p{2.5cm}|p{2.5cm}|p{2.5cm}|}
    \hline
    Reconstruction strategy & aa          & bb( \%) \\ \hline
    Classic                 & 3342 voxels & 68 \%   \\ \hline
    VC                      & 4296 voxels & 87 \%   \\ \hline
    V m=7                   & 4745 voxels & 96 \%   \\ \hline
  \end{tabular}
  \newline\newline 
  \caption{title}\label{tab1}
\end{table}
\end{document}

Best Answer

You have to load the package array, define a new column type with horizontal centering

\newcolumntype{P}[1]{>{\centering\arraybackslash}p{#1}}

and use this one (P) instead of p

\documentclass[conference]{IEEEtran}
\usepackage{array}
\newcolumntype{P}[1]{>{\centering\arraybackslash}p{#1}}

\begin{document}

\begin{table}
  \centering
  \begin{tabular}{|P{2.5cm}|P{2.5cm}|P{2.5cm}|}
    \hline
    Reconstruction strategy & aa          & bb( \%) \\ \hline
    Classic                 & 3342 voxels & 68 \%   \\ \hline
    VC                      & 4296 voxels & 87 \%   \\ \hline
    V m=7                   & 4745 voxels & 96 \%   \\ \hline
  \end{tabular}
  \newline\newline
  \caption{title}\label{tab1}
\end{table}
\end{document}

Output:

enter image description here

If you also want vertical centering, use m instead of p:

\documentclass[conference]{IEEEtran}
\usepackage{array}
\newcolumntype{P}[1]{>{\centering\arraybackslash}p{#1}}
\newcolumntype{M}[1]{>{\centering\arraybackslash}m{#1}}

\begin{document}

\begin{table}
  \centering
  \begin{tabular}{|M{2.5cm}|M{2.5cm}|M{2.5cm}|}
    \hline
    Reconstruction strategy & aa          & bb( \%) \\ \hline
    Classic                 & 3342 voxels & 68 \%   \\ \hline
    VC                      & 4296 voxels & 87 \%   \\ \hline
    V m=7                   & 4745 voxels & 96 \%   \\ \hline
  \end{tabular}
  \newline\newline
  \caption{title}\label{tab1}
\end{table}
\end{document}

Output:

enter image description here

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