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Centering Text Horizontally and Vertically in LaTeX [closed]

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I would like to produce the following:

      a       b
    xxxxx   xxxxx
 1  xxxxx   xxxxx
    xxxxx   xxxxx

    xxxxx   xxxxx
 2  xxxxx   xxxxx
    xxxxx   xxxxx

Where the blocks of 'x's are images, and 'a', 'b', '1' and '2' are text.

Here are my two attempts so far:

\begin{figure}
\begin{center}
\begin{tabular}{ccc}
 & a & b \\
1 & \subfloat[]{\includegraphics[width=0.47\textwidth]{im.png}} &
    \subfloat[]{\includegraphics[width=0.47\textwidth]{im.png}} \\
2 & \subfloat[]{\includegraphics[width=0.47\textwidth]{im.png}} &
    \subfloat[]{\includegraphics[width=0.47\textwidth]{im.png}} \\
\end{tabular}
\end{center}
\end{figure}

Which produces:

      a       b
    xxxxx   xxxxx
    xxxxx   xxxxx
 1  xxxxx   xxxxx

    xxxxx   xxxxx
    xxxxx   xxxxx
 2  xxxxx   xxxxx

And

\begin{figure}
\begin{center}
\begin{tabular}{m{1cm}m{6cm}m{6cm}}
 & a & b \\
1 & \subfloat[]{\includegraphics[width=0.47\textwidth]{im.png}} &
    \subfloat[]{\includegraphics[width=0.47\textwidth]{im.png}} \\
2 & \subfloat[]{\includegraphics[width=0.47\textwidth]{im.png}} &
    \subfloat[]{\includegraphics[width=0.47\textwidth]{im.png}} \\
\end{tabular}
\end{center}
\end{figure}

Which produces:

    a       b
    xxxxx   xxxxx
 1  xxxxx   xxxxx
  开发者_开发百科  xxxxx   xxxxx

    xxxxx   xxxxx
 2  xxxxx   xxxxx
    xxxxx   xxxxx


You can make a new column type, or simply add >{\centering\arraybackslash} before m{6cm} for the two image columns.

For example:

\newcolumntype{C}{>{\centering\arraybackslash} m{6cm} }  %# New column type
\begin{tabular}{m{1cm}CC}                                %# Table with two of them
...

The > directive lets you basically inject the contained code before each entry in that column. We need the \arraybackslash to deal with incompatibility between the centering environment and the tabular environment. [More info can be found here.] 1


I use \dummyimage, because I have no im.png. Replace it with \includegraphics{im.png}.

\font\dummyfont = cmr10 at 100pt
\def\dummyimage{{\vbox to 100pt{\vfil\hbox to 100pt{\hfil\dummyfont A\hfil}\vfil}}}

\hfil\vbox{
\halign{&\hfil\ $\vcenter{\hbox{#}}$\strut \ \hfil\cr
&a&b\cr 
1&\dummyimage&\dummyimage\cr
2&\dummyimage&\dummyimage\cr
}}
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